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us-gaap:HealthcareSectorMember 2024-10-31 0000104865 cik0000104865:C000025724Member oef:IndustrialSectorMember 2024-10-31 0000104865 cik0000104865:C000025724Member oef:ConsumerStaplesSectorMember 2024-10-31 0000104865 cik0000104865:C000025724Member oef:ConsumerDiscretionarySectorMember 2024-10-31 0000104865 cik0000104865:C000025724Member oef:CommunicationsSectorMember 2024-10-31 0000104865 cik0000104865:C000025724Member oef:UnclassifiedSectorMember 2024-10-31 0000104865 cik0000104865:C000025724Member cik0000104865:OtherSecuritiesMember 2024-10-31 0000104865 cik0000104865:C000025724Member cik0000104865:ShortTermSecuritiesAndOtherAssetsLessLiabilitiesMember 2024-10-31 0000104865 cik0000104865:C000077924Member 2024-10-31 0000104865 cik0000104865:C000077924Member oef:CommunicationsSectorMember 2024-10-31 0000104865 cik0000104865:C000077924Member oef:UnclassifiedSectorMember 2024-10-31 0000104865 cik0000104865:C000077924Member cik0000104865:OtherSecuritiesMember 2024-10-31 0000104865 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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM
N-CSR
CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES
Investment Company Act file number
811-00604
Washington Mutual Investors Fund
(Exact name of registrant as specified in charter)
6455 Irvine Center Drive
Irvine, California 92618
(Address of principal executive offices)

Hong T. Le
6455 Irvine Center Drive
Irvine, California 92618
(Name and address of agent for service)
Registrant's telephone number, including area code:
(949) 975-5000
Date of fiscal year end:
April 30
Date of reporting period:
October 31, 2024
ITEM 1 - Reports to Stockholders
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class A
| AWSHX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-A
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$
30		0.56
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional
information
TSR - QR Code - American Funds_Class A
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFAASRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class C
| WSHCX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-C
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$
70		1.31
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of n
e
t assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class C
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFCCSRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class T
| TWMMX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature
. You can also request this information by contacting us at (800) 421-4225.
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class T
$
17		0.31
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds (Mutual Funds)
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFTTSRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class F-1
| WSHFX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-F1
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-1
$
34		0.63
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class F1
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFF1SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class F-2
| WMFFX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-F2
. You can also request this information by contacting us at (800) 421-4225. 
What were t
he
fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-2
$
20		0.37
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class F2
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFF2SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class F-3
| FWMIX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-F3
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 inves
t
ment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-3
$
14		0.26
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class F3
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFF3SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class 529-A
| CWMAX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529A
. You can also request this information by contacting us at (800) 421-4225.
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-A
$
32		0.60
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class 529A
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder
documents
will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF5ASRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class 529-C
| CWMCX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529C
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-C
$
72		1.35
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class 529C
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF5CSRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class 529-E
| CWMEX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529E
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-E
$
45		0.84
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class 529E
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF5ESRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class 529-T
| TMWMX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature
. You can also request this information by contacting us at (800) 421-4225.
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-T
$
20		0.37
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds (Mutual Funds)
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF5TSRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class 529-F-1
| CWMFX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529F1
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
las
t six
months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-1
$
24		0.44
%
*
*Annualized.
Key fund sta
tisti
cs
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Port
fol
io hol
din
gs by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class 529F1
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF5FSRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class 529-F-2
| FWMMX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529F2
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-2
$
19		0.35
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of ad
dition
al inf
orm
ation
TSR - QR Code - American Funds_Class 529F2
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF5XSRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class 529-F-3
| FWWMX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529F3
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-3
$
17		0.32
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Port
folio
holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class 529F3
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF5YSRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-1
| RWMAX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R1
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-1
$
71		1.34
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio h
oldin
gs by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class R1
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most
shareholder
documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFR1SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-2
| RWMBX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R2
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-2
$
72		1.35
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Po
rtfoli
o holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class R2
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be
mailed
to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFR2SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-2E
| RWEBX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R2E
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-2E
$
57		1.06
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class R2E
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be
mailed
to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MF2ESRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-3
| RWMCX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R3
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-3
$
49		0.91
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class R3
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most
shareholder
documents will be mailed to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFR3SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-4
| RWMEX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R4
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-4
$
33		0.61
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional
information
TSR - QR Code - American Funds_Class R4
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be mailed to
shareholders
with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFR4SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-5E
| RWMHX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R5E
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-5E
$
22		0.41
%
*
*Annualized.
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class R5E
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most
shareholder
documents will be mailed to
shareholders
with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be
effective
within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFE5SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-5
| RWMFX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R5
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-5
$
17		0.31
%
*
*Annualized.
Key fund sta
tisti
cs
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of
additional
information
TSR - QR Code - American Funds_Class R5
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder
documents
will be
mailed
to shareholders with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFR5SRX-001-1224 © 2024 Capital Group. All rights reserved.
TSR - American Funds Logo
SEMI-ANNUAL SHAREHOLDER REPORT
Washington Mutual Investors Fund
Class R-6
| RWMGX
for the six months ended October 31, 2024
This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024. You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R6
. You can also request this information by contacting us at (800) 421-4225. 
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-6
$
14		0.26
%
*
*Annualized.
Key fund statistics
Fund net assets (in
millions)
$
189,223
%
Total number of
portfolio
holdings
$
197
%
Portfolio turnover rate
$
12
%
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Availability of additional information
TSR - QR Code - American Funds_Class R6
Scan the QR code to view additional information about the fund, including its prospectus, financial information, holdings and information on proxy voting. Or refer to the web address included at the beginning of this report.
Important information
To reduce fund expenses, only one copy of most shareholder documents will be
mailed
to
shareholders
with multiple accounts at the same address (householding). If you would prefer that your documents not be householded, please contact Capital Group at
(800) 421-4225
, or contact your financial intermediary. Your instructions will typically be effective within 30 days of receipt by Capital Group or your financial intermediary.
Lit. No. MFR6SRX-001-1224 © 2024 Capital Group. All rights reserved.

ITEM 2 - Code of Ethics

Not applicable for filing of semi-annual reports to shareholders.



ITEM 3 - Audit Committee Financial Expert

Not applicable for filing of semi-annual reports to shareholders.



ITEM 4 - Principal Accountant Fees and Services

Not applicable for filing of semi-annual reports to shareholders.



ITEM 5 - Audit Committee of Listed Registrants

Not applicable to this Registrant, insofar as the Registrant is not a listed issuer as defined in Rule 10A-3 under the Securities Exchange Act of 1934.



ITEM 6 - Investments

The schedule of investments is included as part of the material filed under Item 7 of this Form.



ITEM 7 - Financial Statements and Financial Highlights for Open-End Management Investment Companies



 
Washington Mutual Investors Fund
Financial Statements and Other Information
N-CSR Items 7-11
for the six months ended October 31, 2024
Lit. No. MFGEFP2-001-1224 © 2024 Capital Group. All rights reserved.
Investment portfolio October 31, 2024unaudited
 
Common stocks 96.80%
 
Shares
Value
(000)
Energy
4.41%
Canadian Natural Resources, Ltd.
34,959,725
$1,189,330
Cenovus Energy, Inc.
16,143,893
259,432
 
Chevron Corp.
4,624,354
688,196
 
ConocoPhillips
7,389,612
809,458
 
EOG Resources, Inc.
16,311,754
1,989,382
 
Exxon Mobil Corp.
17,687,141
2,065,504
 
Halliburton Co.
21,475,170
595,721
 
Schlumberger NV
7,239,368
290,082
 
South Bow Corp.1
1,787,678
44,620
 
TC Energy Corp.
8,938,391
415,725
 
 
8,347,450
 
Materials
2.80%
Air Products and Chemicals, Inc.
374,095
116,168
Celanese Corp.
5,101,614
642,650
 
Corteva, Inc.
13,834,019
842,769
 
Freeport-McMoRan, Inc.
4,498,454
202,520
 
H.B. Fuller Co.
1,612,937
118,035
 
Linde PLC
4,082,436
1,862,203
 
LyondellBasell Industries NV
2,593,633
225,257
 
Mosaic Co.
5,993,648
160,390
 
Nucor Corp.
1,992,519
282,619
 
Rio Tinto PLC (ADR)
4,614,043
299,405
 
Royal Gold, Inc.
469,839
68,625
 
Wheaton Precious Metals Corp.2
7,182,532
474,119
 
 
5,294,760
 
Industrials
10.95%
3M Co.
2,544,126
326,844
ABB, Ltd. (ADR)2
8,277,862
458,842
 
BAE Systems PLC (ADR)
3,112,789
200,619
 
Boeing Co. (The)1
5,197,558
776,047
 
Broadridge Financial Solutions, Inc.
783,768
165,265
 
Carrier Global Corp.
8,836,580
642,596
 
Caterpillar, Inc.
4,878,249
1,835,197
 
CSX Corp.
19,292,848
649,011
 
Deere & Co.
1,211,365
490,227
 
Delta Air Lines, Inc.
5,383,090
308,020
 
Equifax, Inc.
1,327,805
351,895
 
FedEx Corp.
1,218,710
333,744
 
General Electric Co.
12,943,155
2,223,375
 
HEICO Corp.
771,609
189,006
 
Honeywell International, Inc.
792,967
163,098
 
Ingersoll-Rand, Inc.
3,362,567
322,806
 
Johnson Controls International PLC
9,175,870
693,237
 
L3Harris Technologies, Inc.
4,070,129
1,007,235
 
Lennox International, Inc.
150,894
90,924
 
Lockheed Martin Corp.
310,835
169,731
 
Northrop Grumman Corp.
3,989,577
2,030,775
 
PACCAR, Inc.
5,073,423
529,057
 
Parker-Hannifin Corp.
183,522
116,366
 
Paychex, Inc.
8,718,321
1,214,724
 
Republic Services, Inc.
1,181,526
233,942
 
RTX Corp.
19,531,677
2,363,138
 
Southwest Airlines Co.
10,061,229
307,672
 
TransUnion
3,225,040
326,697
 
Union Pacific Corp.
5,582,057
1,295,428
 
United Parcel Service, Inc., Class B
1,121,791
150,387
 
Veralto Corp.
2,340,659
239,192
 
Waste Connections, Inc.
1,728,053
305,433
 
Waste Management, Inc.
960,906
207,412
 
 
20,717,942
 
1
Washington Mutual Investors Fund
Common stocks (continued)
 
Shares
Value
(000)
 
Consumer
discretionary
7.43%
Advance Auto Parts, Inc.2
521,357
$18,606
Amazon.com, Inc.1
2,401,029
447,552
Chipotle Mexican Grill, Inc.1
2,190,250
122,150
 
D.R. Horton, Inc.
1,997,925
337,649
 
Darden Restaurants, Inc.3
9,509,021
1,521,634
 
General Motors Co.
25,155,404
1,276,888
 
Home Depot, Inc.
6,277,709
2,471,848
 
Lennar Corp., Class A
1,066,048
181,548
 
Marriott International, Inc., Class A
1,731,856
450,317
 
McDonald’s Corp.
1,108,634
323,843
 
NIKE, Inc., Class B
10,818,582
834,437
 
Royal Caribbean Cruises, Ltd.
9,214,736
1,901,461
 
Sony Group Corp. (ADR)2
3,653,445
64,301
 
Starbucks Corp.
11,689,439
1,142,058
 
Tesla, Inc.1
420,111
104,965
 
TJX Companies, Inc. (The)
5,782,062
653,547
 
Tractor Supply Co.
1,172,850
311,403
 
Vail Resorts, Inc.
1,835,904
304,191
 
YUM! Brands, Inc.
12,060,964
1,581,916
 
 
14,050,314
 
Consumer staples
8.14%
Altria Group, Inc.
21,005,626
1,143,966
British American Tobacco PLC (ADR)
20,574,565
719,698
 
Bunge Global SA
1,339,540
112,548
 
Church & Dwight Co., Inc.
3,197,918
319,504
 
Coca-Cola Co.
8,240,022
538,156
 
Constellation Brands, Inc., Class A
6,061,459
1,408,319
 
Costco Wholesale Corp.
561,619
490,956
 
Danone (ADR)2
26,491,854
379,628
 
Dollar General Corp.
5,053,180
404,457
 
Hershey Co.
4,145,088
736,085
 
Keurig Dr Pepper, Inc.
37,722,927
1,242,971
 
Kimberly-Clark Corp.
1,645,577
220,804
 
Kraft Heinz Co. (The)
19,510,449
652,820
 
Mondelez International, Inc., Class A
7,191,766
492,492
 
Philip Morris International, Inc.
35,585,119
4,722,145
 
Procter & Gamble Co.
4,744,619
783,716
 
Reckitt Benckiser Group PLC (ADR)
4,249,507
51,377
 
Sysco Corp.
5,144,902
385,610
 
Target Corp.
3,987,065
598,219
 
 
15,403,471
 
Health care
14.55%
Abbott Laboratories
16,577,414
1,879,381
AbbVie, Inc.
15,456,359
3,151,088
 
Amgen, Inc.
2,347,354
751,529
 
AstraZeneca PLC (ADR)
23,690,375
1,685,570
 
Bristol-Myers Squibb Co.
6,450,211
359,728
 
CVS Health Corp.
24,073,519
1,359,191
 
Danaher Corp.
4,957,041
1,217,747
 
Elevance Health, Inc.
1,686,862
684,461
 
Eli Lilly and Co.
6,248,220
5,184,398
 
Gilead Sciences, Inc.
22,525,757
2,000,738
 
Humana, Inc.
1,310,778
337,958
 
Illumina, Inc.1
237,829
34,281
 
Johnson & Johnson
2,138,653
341,885
 
Merck & Co., Inc.
6,540,695
669,244
 
Novo Nordisk AS, Class B (ADR)
3,940,909
441,185
 
Pfizer, Inc.
11,222,599
317,599
 
Regeneron Pharmaceuticals, Inc.1
97,677
81,873
 
UnitedHealth Group, Inc.
9,739,254
5,497,809
 
Vertex Pharmaceuticals, Inc.1
2,936,678
1,397,800
 
Zoetis, Inc., Class A
808,214
144,492
 
 
27,537,957
 
Washington Mutual Investors Fund
2
Common stocks (continued)
 
Shares
Value
(000)
 
Financials
16.99%
American Express Co.
1,416,991
$382,701
Aon PLC, Class A
1,730,978
635,044
 
Apollo Asset Management, Inc.
7,092,861
1,016,123
 
Arthur J. Gallagher & Co.
3,762,337
1,057,969
 
Bank of America Corp.
12,167,268
508,835
 
BlackRock, Inc.
2,360,464
2,315,686
 
Blackstone, Inc.
10,542,489
1,768,503
 
Brookfield Asset Management, Ltd., Class A
8,341,072
442,410
 
Canadian Imperial Bank of Commerce2
4,935,470
308,763
 
Capital One Financial Corp.
3,606,761
587,145
 
Carlyle Group, Inc. (The)
5,260,283
263,172
 
Chubb, Ltd.
5,977,041
1,688,156
 
Citizens Financial Group, Inc.
18,424,930
776,058
 
CME Group, Inc., Class A
2,889,466
651,170
 
Discover Financial Services
7,558,634
1,121,928
 
Fifth Third Bancorp
3,004,436
131,234
 
Goldman Sachs Group, Inc.
646,068
334,528
 
Intercontinental Exchange, Inc.
3,242,799
505,455
 
JPMorgan Chase & Co.
13,684,503
3,036,865
 
KKR & Co., Inc.
12,533,272
1,732,600
 
Marsh & McLennan Companies, Inc.
19,757,546
4,311,887
 
Mastercard, Inc., Class A
3,780,562
1,888,731
 
Morgan Stanley
8,864,253
1,030,469
 
MSCI, Inc.
174,834
99,865
 
Nasdaq, Inc.
4,020,878
297,223
 
PNC Financial Services Group, Inc.
1,175,817
221,371
 
S&P Global, Inc.
1,927,676
925,978
 
Truist Financial Corp.
14,775,383
636,080
 
Visa, Inc., Class A
7,564,400
2,192,541
 
Wells Fargo & Co.
19,805,387
1,285,766
 
 
32,154,256
 
Information
technology
19.97%
Accenture PLC, Class A
1,386,273
478,015
Apple, Inc.
18,598,890
4,201,675
Applied Materials, Inc.
6,390,539
1,160,394
 
ASM International NV (ADR)
466,887
260,836
 
ASML Holding NV (ADR)
2,110,831
1,419,639
 
Broadcom, Inc.
69,937,340
11,873,262
 
Cadence Design Systems, Inc.1
691,589
190,962
 
Intel Corp.
11,590,730
249,432
 
KLA Corp.
869,621
579,368
 
Microsoft Corp.
24,826,990
10,088,447
 
Motorola Solutions, Inc.
2,658,926
1,194,788
 
NetApp, Inc.
1,594,318
183,841
 
NVIDIA Corp.
13,358,758
1,773,509
 
Oracle Corp.
5,897,355
989,812
 
Salesforce, Inc.
1,289,634
375,761
 
SAP SE (ADR)2
7,766,717
1,814,616
 
Synopsys, Inc.1
554,785
284,943
 
Texas Instruments, Inc.
3,312,266
672,920
 
 
37,792,220
 
Communication
services
5.02%
Alphabet, Inc., Class A
6,987,667
1,195,660
Alphabet, Inc., Class C
12,395,139
2,140,516
AT&T, Inc.
2,584,647
58,258
 
Comcast Corp., Class A
63,882,387
2,789,744
 
Deutsche Telekom AG (ADR)2
3,790,388
114,508
 
Electronic Arts, Inc.
2,052,672
309,645
 
Meta Platforms, Inc., Class A
3,390,970
1,924,647
 
Verizon Communications, Inc.
6,891,494
290,339
 
Walt Disney Co. (The)
7,055,934
678,781
 
 
9,502,098
 
3
Washington Mutual Investors Fund
Common stocks (continued)
 
Shares
Value
(000)
 
Utilities
3.73%
CenterPoint Energy, Inc.
9,534,757
$281,561
Constellation Energy Corp.
7,984,885
2,099,705
 
Entergy Corp.
2,031,552
314,444
 
FirstEnergy Corp.
23,653,431
989,423
 
NextEra Energy, Inc.
2,137,276
169,379
 
Public Service Enterprise Group, Inc.
4,250,000
379,993
 
Sempra
17,797,468
1,483,775
 
Southern Co. (The)
14,626,223
1,331,425
 
 
7,049,705
 
Real estate
2.81%
American Tower Corp. REIT
2,098,900
448,199
Equinix, Inc. REIT
482,685
438,317
 
Extra Space Storage, Inc. REIT
7,872,276
1,285,543
 
Mid-America Apartment Communities, Inc. REIT
3,237,142
489,909
 
Prologis, Inc. REIT
4,326,156
488,596
 
Public Storage REIT
791,547
260,466
 
Welltower, Inc. REIT
14,188,512
1,913,746
 
 
5,324,776
 
Total common stocks (cost: $103,017,203,000)
183,174,949
Convertible stocks 0.20%
 
 
 
Industrials
0.16%
Boeing Co., Series A, convertible preferred depositary shares, 6.00% 10/15/2027
5,811,500
312,252
 
Financials
0.04%
Apollo Global Management, Inc., Class A, cumulative convertible preferred shares,
6.75% 7/31/2026
906,506
69,230
Total convertible stocks (cost: $335,900,000)
381,482
Short-term securities 3.14%
 
 
 
Money market investments 3.01%
 
Capital Group Central Cash Fund 4.87%3,4
56,926,986
5,692,699
 
 
 
 
Money market investments purchased with collateral from securities on loan 0.13%
 
Capital Group Central Cash Fund 4.87%3,4,5
934,650
93,465
 
Invesco Short-Term Investments Trust – Government & Agency Portfolio,
Institutional Class 4.77%4,5
38,864,220
38,865
 
BlackRock Liquidity Funds – FedFund, Institutional Shares 4.76%4,5
16,400,000
16,400
 
Dreyfus Treasury Obligations Cash Management, Institutional Shares 4.72%4,5
16,400,000
16,400
 
Fidelity Investments Money Market Government Portfolio, Class I 4.70%4,5
16,400,000
16,400
 
Goldman Sachs Financial Square Government Fund, Institutional Shares 4.70%4,5
16,400,000
16,400
 
Morgan Stanley Institutional Liquidity Funds – Government Portfolio,
Institutional Class 4.78%4,5
16,400,000
16,400
 
State Street Institutional U.S. Government Money Market Fund,
Premier Class 4.82%4,5
16,083,052
16,083
 
RBC Funds Trust – U.S. Government Money Market Fund,
RBC Institutional Class 1 4.77%4,5
12,000,000
12,000
 
 
242,413
 
Total short-term securities (cost: $5,935,138,000)
5,935,112
 
Total investment securities 100.14% (cost: $109,288,241,000)
189,491,543
 
Other assets less liabilities (0.14)%
(268,326
)
 
Net assets 100.00%
$189,223,217
 
Washington Mutual Investors Fund
4
Investments in affiliates3
 
 
Value at
5/1/2024
(000)
Additions
(000)
Reductions
(000)
Net
realized
gain (loss)
(000)
Net
unrealized
appreciation
(depreciation)
(000)
Value at
10/31/2024
(000)
Dividend
or interest
income
(000)
Common stocks 0.80%
Materials 0.00%
Celanese Corp. 6
$1,193,729
$—
$337,492
$(16,246
)
$(197,341
)
$—
$9,009
Consumer discretionary 0.80%
Darden Restaurants, Inc.
1,217,193
226,493
417
269
78,096
1,521,634
24,417
YUM! Brands, Inc.6
2,194,316
1,253
464,394
(12,181
)
(137,078
)
—
20,813
 
1,521,634
Total common stocks
1,521,634
Short-term securities 3.06%
Money market investments 3.01%
Capital Group Central Cash Fund 4.87% 4
6,398,719
8,649,566
9,355,563
235
(258
)
5,692,699
171,548
Money market investments purchased with collateral
from securities on loan 0.05%
Capital Group Central Cash Fund 4.87% 4,5
659
92,806
7
93,465
—
8
Total short-term securities
5,786,164
Total 3.86%
$(27,923
)
$(256,581
)
$7,307,798
$225,787
 
1
Security did not produce income during the last 12 months.
2
All or a portion of this security was on loan. The total value of all such securities was $262,170,000, which represented .14% of the net assets of the fund. Refer to
Note 5 for more information on securities lending.
3
Affiliate of the fund or part of the same “group of investment companies“ as the fund, as defined under the Investment Company Act of 1940, as amended.
4
Rate represents the seven-day yield at 10/31/2024.
5
Security purchased with cash collateral from securities on loan. Refer to Note 5 for more information on securities lending.
6
Affiliated issuer during the reporting period but no longer an affiliate at 10/31/2024. Refer to the investment portfolio for the security value at 10/31/2024.
7
Represents net activity. Refer to Note 5 for more information on securities lending.
8
Dividend income is included with securities lending income in the fund’s statement of operations and is not shown in this table.
 
Key to abbreviation(s)
ADR = American Depositary Receipts
REIT = Real Estate Investment Trust
Refer to the notes to financial statements.
 
5
Washington Mutual Investors Fund
Financial statements
Statement of assets and liabilities at October 31, 2024unaudited
(dollars in thousands) 
Assets:
Investment securities, at value (includes $262,170 of
investment securities on loan):
Unaffiliated issuers (cost: $102,426,883)
$182,183,745
Affiliated issuers (cost: $6,861,358)
7,307,798
$189,491,543
Cash
418
Cash denominated in currencies other than U.S. dollars (cost: $5,257)
5,257
Receivables for:
Sales of investments
204,352
Sales of fund’s shares
127,968
Dividends
210,511
Securities lending income
63
Other
3
542,897
 
190,040,115
Liabilities:
Collateral for securities on loan
242,413
Payables for:
Purchases of investments
368,722
Repurchases of fund’s shares
121,931
Investment advisory services
36,325
Services provided by related parties
28,207
Board members’ deferred compensation
18,429
Other
871
574,485
Net assets at October 31, 2024
$189,223,217
Net assets consist of:
Capital paid in on shares of beneficial interest
$100,981,306
Total distributable earnings (accumulated loss)
88,241,911
Net assets at October 31, 2024
$189,223,217
Refer to the notes to financial statements.
 
Washington Mutual Investors Fund
6
Financial statements (continued)
Statement of assets and liabilities at October 31, 2024 (continued)unaudited
(dollars and shares in thousands, except per-share amounts)
Shares of beneficial interest issued and outstanding (no stated par value) —
unlimited shares authorized (2,976,492 total shares outstanding) 
 
Net assets
Shares
outstanding
Net asset value
per share
Class A
$87,461,875
1,374,726
$63.62
Class C
1,390,282
22,279
62.40
Class T
15
—
*
63.61
Class F-1
2,286,409
36,135
63.27
Class F-2
35,014,803
551,127
63.53
Class F-3
11,230,991
176,636
63.58
Class 529-A
3,498,855
55,182
63.41
Class 529-C
75,965
1,207
62.94
Class 529-E
112,268
1,786
62.86
Class 529-T
25
—
*
63.61
Class 529-F-1
18
—
*
63.14
Class 529-F-2
438,398
6,892
63.61
Class 529-F-3
111
2
63.61
Class R-1
67,105
1,071
62.63
Class R-2
778,545
12,510
62.23
Class R-2E
118,578
1,877
63.18
Class R-3
1,729,690
27,536
62.82
Class R-4
2,652,049
42,015
63.12
Class R-5E
557,063
8,776
63.47
Class R-5
662,692
10,422
63.59
Class R-6
41,147,480
646,313
63.66
*
Amount less than one thousand. 
Refer to the notes to financial statements.
 
7
Washington Mutual Investors Fund
Financial statements (continued)
Statement of operations for the six months ended October 31, 2024unaudited
(dollars in thousands) 
Investment income:
Income:
Dividends (net of non-U.S. taxes of $10,646;
also includes $225,787 from affiliates)
$1,871,119
Interest from unaffiliated issuers
1,360
Securities lending income (net of fees)
820
$1,873,299
Fees and expenses*:
Investment advisory services
207,585
Distribution services
130,449
Transfer agent services
50,499
Administrative services
28,011
529 plan services
1,123
Reports to shareholders
1,403
Registration statement and prospectus
1,265
Board members’ compensation
1,971
Auditing and legal
298
Custodian
3,010
Other
163
425,777
Net investment income
1,447,522
Net realized gain (loss) and unrealized appreciation (depreciation):
Net realized gain (loss) on:
Investments:
Unaffiliated issuers
7,585,927
Affiliated issuers
(27,923
)
In-kind redemptions
35,981
Currency transactions
(200
)
7,593,785
Net unrealized appreciation (depreciation) on:
Investments:
Unaffiliated issuers
11,964,091
Affiliated issuers
(256,581
)
Currency translations
10
11,707,520
Net realized gain (loss) and unrealized appreciation (depreciation)
19,301,305
Net increase (decrease) in net assets resulting from operations
$20,748,827
*
Additional information related to class-specific fees and expenses is included in the notes to financial statements.
Refer to the notes to financial statements.
 
Washington Mutual Investors Fund
8
Financial statements (continued)
Statements of changes in net assets
(dollars in thousands) 
 
Six months ended
October 31,
Year ended
April 30,
 
2024*
2024
 
 
Operations:
Net investment income
$1,447,522
$2,934,207
Net realized gain (loss)
7,593,785
12,179,738
Net unrealized appreciation (depreciation)
11,707,520
13,891,146
Net increase (decrease) in net assets resulting from operations
20,748,827
29,005,091
Distributions paid to shareholders
(9,333,812
)
(10,257,462
)
Net capital share transactions
3,871,852
1,554,663
Total increase (decrease) in net assets
15,286,867
20,302,292
Net assets:
Beginning of period
173,936,350
153,634,058
End of period
$189,223,217
$173,936,350
*
Unaudited.
Refer to the notes to financial statements.
 
9
Washington Mutual Investors Fund
Notes to financial statementsunaudited
1. Organization
Washington Mutual Investors Fund (the “fund”) is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end, diversified management investment company. The fund’s investment objective is to produce income and to provide an opportunity for growth of principal consistent with sound common stock investing.
The fund has 21 share classes consisting of six retail share classes (Classes A, C, T, F-1, F-2 and F-3), seven 529 college savings plan share classes (Classes 529-A, 529-C, 529-E, 529-T, 529-F-1, 529-F-2 and 529-F-3) and eight retirement plan share classes (Classes R-1, R-2, R-2E, R-3, R-4, R-5E, R-5 and R-6). The 529 college savings plan share classes can be used to save for college education. The retirement plan share classes are generally offered only through eligible employer-sponsored retirement plans. The fund’s share classes are described further in the following table: 
Share class
Initial sales charge
Contingent deferred sales
charge upon redemption
Conversion feature
Classes A and 529-A
Up to 5.75% for
Class A; up to 3.50% for
Class 529-A
None (except 1.00% for certain
redemptions within 18 months of purchase
without an initial sales charge)
None
Classes C and 529-C
None
1.00% for redemptions within one year of
purchase
Class C converts to Class A
after eight years and Class 529-C
converts to Class 529-A after five years
Class 529-E
None
None
None
Classes T and 529-T*
Up to 2.50%
None
None
Classes F-1, F-2, F-3, 529-F-1,
529-F-2 and 529-F-3
None
None
None
Classes R-1, R-2, R-2E, R-3, R-4,
R-5E, R-5 and R-6
None
None
None
*
Class T and 529-T shares are not available for purchase.
Holders of all share classes have equal pro rata rights to the assets, dividends and liquidation proceeds of the fund. Each share class has identical voting rights, except for the exclusive right to vote on matters affecting only its class. Share classes have different fees and expenses (“class-specific fees and expenses”), primarily due to different arrangements for distribution, transfer agent and administrative services. Differences in class-specific fees and expenses will result in differences in net investment income and, therefore, the payment of different per-share dividends by each share class.
2. Significant accounting policies
The fund is an investment company that applies the accounting and reporting guidance issued in Topic 946 by the U.S. Financial Accounting Standards Board. The fund’s financial statements have been prepared to comply with U.S. generally accepted accounting principles (“U.S. GAAP“). These principles require the fund’s investment adviser to make estimates and assumptions that affect reported amounts and disclosures. Actual results could differ from those estimates. Subsequent events, if any, have been evaluated through the date of issuance in the preparation of the financial statements. The fund follows the significant accounting policies described in this section, as well as the valuation policies described in the next section on valuation.
Security transactions and related investment income — Security transactions are recorded by the fund as of the date the trades are executed with brokers. Realized gains and losses from security transactions are determined based on the specific identified cost of the securities. In the event a security is purchased with a delayed payment date, the fund will segregate liquid assets sufficient to meet its payment obligations. Dividend income is recognized on the ex-dividend date and interest income is recognized on an accrual basis. Market discounts, premiums and original issue discounts on fixed-income securities are amortized daily over the expected life of the security.
Class allocations — Income, fees and expenses (other than class-specific fees and expenses), realized gains and losses and unrealized appreciation and depreciation are allocated daily among the various share classes based on their relative net assets. Class-specific fees and expenses, such as distribution, transfer agent and administrative services, are charged directly to the respective share class.
Distributions paid to shareholders — Income dividends and capital gain distributions are recorded on the ex-dividend date.
 
Washington Mutual Investors Fund
10
In-kind redemptions — The fund normally redeems shares in cash; however, under certain conditions and circumstances, payment of the redemption price wholly or partly with portfolio securities or other fund assets may be permitted. A redemption of shares in-kind is based upon the closing value of the shares being redeemed as of the trade date. Realized gains or losses resulting from redemptions of shares in-kind are reflected separately in the fund’s statement of operations.
3. Valuation
Capital Research and Management Company (“CRMC”), the fund’s investment adviser, values the fund’s investments at fair value as defined by U.S. GAAP. The net asset value per share is calculated once daily as of the close of regular trading on the New York Stock Exchange, normally 4 p.m. New York time, each day the New York Stock Exchange is open.
Methods and inputs — The fund’s investment adviser uses the following methods and inputs to establish the fair value of the fund’s assets and liabilities. Use of particular methods and inputs may vary over time based on availability and relevance as market and economic conditions evolve.
Equity securities, including depositary receipts, are generally valued at the official closing price of, or the last reported sale price on, the exchange or market on which such securities are traded, as of the close of business on the day the securities are being valued or, lacking any sales, at the last available bid price. Prices for each security are taken from the principal exchange or market on which the security trades.
Fixed income securities, including short-term securities, are generally valued at evaluated prices obtained from third-party pricing vendors. Vendors value such securities based on one or more of the following inputs: benchmark yields, transactions, bids, offers, quotations from dealers and trading systems, new issues, spreads, interest rate volatilities, and other relationships observed in the markets among comparable securities; and proprietary pricing models such as yield measures calculated using factors such as cash flows, financial or collateral performance and other reference data.
Securities with both fixed-income and equity characteristics, or equity securities traded principally among fixed-income dealers, are generally valued in the manner described for either equity or fixed-income securities, depending on which method is deemed most appropriate by the fund’s investment adviser. The Capital Group Central Cash Fund (“CCF”), a fund within the Capital Group Central Fund Series (“Central Funds“), is valued based upon a floating net asset value, which fluctuates with changes in the value of CCF’s portfolio securities. The underlying securities are valued based on the policies and procedures in CCF’s statement of additional information.
Securities and other assets for which representative market quotations are not readily available or are considered unreliable by the fund’s investment adviser are fair valued as determined in good faith under fair valuation guidelines adopted by the fund’s investment adviser and approved by the board of trustees as further described. The investment adviser follows fair valuation guidelines, consistent with U.S. Securities and Exchange Commission rules and guidance, to consider relevant principles and factors when making fair value determinations. The investment adviser considers relevant indications of value that are reasonably and timely available to it in determining the fair value to be assigned to a particular security, such as the type and cost of the security, contractual or legal restrictions on resale of the security, relevant financial or business developments of the issuer, actively traded similar or related securities, dealer or broker quotes, conversion or exchange rights on the security, related corporate actions, significant events occurring after the close of trading in the security, and changes in overall market conditions. In addition, the closing prices of equity securities that trade in markets outside U.S. time zones may be adjusted to reflect significant events that occur after the close of local trading but before the net asset value of each share class of the fund is determined. Fair valuations of investments that are not actively trading involve judgment and may differ materially from valuations that would have been used had greater market activity occurred.
 
11
Washington Mutual Investors Fund
Processes and structure — The fund’s board of trustees has designated the fund’s investment adviser to make fair value determinations, subject to board oversight. The investment adviser has established a Joint Fair Valuation Committee (the “Committee”) to administer, implement and oversee the fair valuation process and to make fair value decisions. The Committee regularly reviews its own fair value decisions, as well as decisions made under its standing instructions to the investment adviser’s valuation team. The Committee reviews changes in fair value measurements from period to period, pricing vendor information and market data, and may, as deemed appropriate, update the fair valuation guidelines to better reflect the results of back testing and address new or evolving issues. Pricing decisions, processes and controls over security valuation are also subject to additional internal reviews facilitated by the investment adviser’s global risk management group. The Committee reports changes to the fair valuation guidelines to the board of trustees. The fund’s board and audit committee also regularly review reports that describe fair value determinations and methods.
Classifications — The fund’s investment adviser classifies the fund’s assets and liabilities into three levels based on the inputs used to value the assets or liabilities. Level 1 values are based on quoted prices in active markets for identical securities. Level 2 values are based on significant observable market inputs, such as quoted prices for similar securities and quoted prices in inactive markets. Certain securities trading outside the U.S. may transfer between Level 1 and Level 2 due to valuation adjustments resulting from significant market movements following the close of local trading. Level 3 values are based on significant unobservable inputs that reflect the investment adviser’s determination of assumptions that market participants might reasonably use in valuing the securities. The valuation levels are not necessarily an indication of the risk or liquidity associated with the underlying investment. For example, U.S. government securities are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.
As of October 31, 2024, all of the fund’s investments were classifed as Level 1.
4. Risk factors
Investing in the fund may involve certain risks including, but not limited to, those described below.
Market conditions — The prices of, and the income generated by, the common stocks and other securities held by the fund may decline – sometimes rapidly or unpredictably – due to various factors, including events or conditions affecting the general economy or particular industries or companies; overall market changes; local, regional or global political, social or economic instability; governmental, governmental agency or central bank responses to economic conditions; changes in inflation rates; and currency exchange rate, interest rate and commodity price fluctuations.
Economies and financial markets throughout the world are highly interconnected. Economic, financial or political events, trading and tariff arrangements, wars, terrorism, cybersecurity events, natural disasters, public health emergencies (such as the spread of infectious disease), bank failures and other circumstances in one country or region, including actions taken by governmental or quasi-governmental authorities in response to any of the foregoing, could have impacts on global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries affected, the value and liquidity of the fund’s investments may be negatively affected by developments in other countries and regions.
Issuer risks — The prices of, and the income generated by, securities held by the fund may decline in response to various factors directly related to the issuers of such securities, including reduced demand for an issuer’s goods or services, poor management performance, major litigation, investigations or other controversies related to the issuer, changes in the issuer’s financial condition or credit rating, changes in government regulations affecting the issuer or its competitive environment and strategic initiatives such as mergers, acquisitions or dispositions and the market response to any such initiatives. An individual security may also be affected by factors relating to the industry or sector of the issuer or the securities markets as a whole, and conversely an industry or sector or the securities markets may be affected by a change in financial condition or other event affecting a single issuer. 
Investing in income-oriented stocks — The value of the fund’s securities and income provided by the fund may be reduced by changes in the dividend policies of, and the capital resources available for dividend payments at, the companies in which the fund invests.
Investing in growth-oriented stocks — Growth-oriented common stocks and other equity-type securities (such as preferred stocks, convertible preferred stocks and convertible bonds) may involve larger price swings and greater potential for loss than other types of investments.
Management — The investment adviser to the fund actively manages the fund’s investments. Consequently, the fund is subject to the risk that the methods and analyses, including models, tools and data, employed by the investment adviser in this process may be flawed or incorrect and may not produce the desired results. This could cause the fund to lose value or its investment results to lag relevant benchmarks or other funds with similar objectives.
 
Washington Mutual Investors Fund
12
5. Certain investment techniques
Securities lending — The fund has entered into securities lending transactions in which the fund earns income by lending investment securities to brokers, dealers or other institutions. Each transaction involves three parties: the fund, acting as the lender of the securities, a borrower, and a lending agent that acts as an intermediary.
Securities lending transactions are entered into by the fund under a securities lending agent agreement with the lending agent. The lending agent facilitates the exchange of securities between the fund and approved borrowers, ensures that securities loans are properly coordinated and documented, marks-to-market the value of collateral daily, secures additional collateral from a borrower if it falls below preset terms, and may reinvest cash collateral on behalf of the fund according to agreed parameters. The lending agent provides indemnification to the fund against losses resulting from a borrower default. Although risk is mitigated by the collateral and indemnification, the fund could experience a delay in recovering its securities and a potential loss of income or value if a borrower fails to return securities, collateral investments decline in value or the lending agent fails to perform.
The borrower is required to post highly liquid assets, such as cash or U.S. government securities, as collateral for the loan in an amount at least equal to the value of the securities loaned. Investments made with cash collateral are recognized as assets in the fund’s investment portfolio. The same amount is recorded as a liability in the fund’s statement of assets and liabilities. While securities are on loan, the fund will continue to receive the equivalent of the interest, dividends or other distributions paid by the issuer, as well as a portion of the interest on the investment of the collateral. Additionally, although the fund does not have the right to vote on securities while they are on loan, the fund has a right to consent on corporate actions and a right to recall loaned securities to vote. A borrower is obligated to return loaned securities at the conclusion of a loan or, during the pendency of a loan, on demand from the fund.
As of October 31, 2024, the total value of securities on loan was $262,170,000, and the total value of collateral received was $268,084,000. Collateral received includes cash of $242,413,000 and U.S. government securities of $25,671,000. Investment securities purchased from cash collateral are disclosed in the fund’s investment portfolio as short-term securities. Securities received as collateral are not recognized as fund assets. The contractual maturity of cash collateral received under the securities lending agreement is classified as overnight and continuous.
6. Taxation and distributions
Federal income taxation — The fund complies with the requirements under Subchapter M of the Internal Revenue Code applicable to regulated investment companies and intends to distribute substantially all of its net taxable income and net capital gains each year. The fund is not subject to income taxes to the extent such distributions are made. Therefore, no federal income tax provision is required.
As of and during the period ended October 31, 2024, the fund did not have a liability for any unrecognized tax benefits. The fund recognizes interest and penalties, if any, related to unrecognized tax benefits as income tax expense in the statement of operations. During the period, the fund did not incur any significant interest or penalties.
The fund’s tax returns are generally not subject to examination by federal, state and, if applicable, non-U.S. tax authorities after the expiration of each jurisdiction’s statute of limitations, which is typically three years after the date of filing but can be extended in certain jurisdictions.
Non-U.S. taxation — Dividend and interest income are recorded net of non-U.S. taxes paid. The fund may file withholding tax reclaims in certain jurisdictions to recover a portion of amounts previously withheld. As a result of rulings from European courts, the fund filed for additional reclaims related to prior years ("EU reclaims"). These reclaims are recorded when the amount is known and there are no significant uncertainties on collectability. During the six months ended October 31, 2024, the fund recognized $1,066,000 in EU reclaims (net of $15,000 in fees and the effect of realized gain or loss from currency translations) and $28,000 in interest related to European court rulings, which is included in dividend income and interest income, respectively, in the fund’s statement of operations. Gains realized by the fund on the sale of securities in certain countries, if any, may be subject to non-U.S. taxes. The fund generally records an estimated deferred tax liability based on unrealized gains to provide for potential non-U.S. taxes payable upon the sale of these securities.
Distributions — Distributions determined on a tax basis may differ from net investment income and net realized gains for financial reporting purposes. These differences are due primarily to different treatment for items such as currency gains and losses; short-term capital gains and losses; capital losses related to sales of certain securities within 30 days of purchase and cost of investments sold. The fiscal year in which amounts are distributed may differ from the year in which the net investment income and net realized gains are recorded by the fund for financial reporting purposes.
 
13
Washington Mutual Investors Fund
The components of distributable earnings on a tax basis are reported as of the fund’s most recent year-end. As of April 30, 2024, the components of distributable earnings on a tax basis were as follows (dollars in thousands): 
Undistributed ordinary income
$400,411
Undistributed long-term capital gains
8,034,054
As of October 31, 2024, the tax basis unrealized appreciation (depreciation) and cost of investments were as follows (dollars in thousands): 
Gross unrealized appreciation on investments
$81,922,630
Gross unrealized depreciation on investments
(1,806,902
)
Net unrealized appreciation (depreciation) on investments
80,115,728
Cost of investments
109,375,815
Distributions paid were characterized for tax purposes as follows (dollars in thousands): 
 
Six months ended October 31, 2024
Year ended April 30, 2024
Share class
Ordinary
income
Long-term
capital gains
Total
distributions
paid
Ordinary
income
Long-term
capital gains
Total
distributions
paid
Class A
$558,608
$3,725,157
$4,283,765
$1,289,727
$3,415,650
$4,705,377
Class C
4,043
61,972
66,015
12,914
61,450
74,364
Class T
—
*
1
1
—
*
1
1
Class F-1
13,932
97,880
111,812
34,325
95,971
130,296
Class F-2
254,482
1,479,384
1,733,866
565,839
1,336,514
1,902,353
Class F-3
84,737
455,664
540,401
178,292
397,074
575,366
Class 529-A
21,722
150,154
171,876
50,866
138,493
189,359
Class 529-C
202
3,501
3,703
704
3,684
4,388
Class 529-E
575
4,861
5,436
1,444
4,619
6,063
Class 529-T
—
*
1
1
—
*
1
1
Class 529-F-1
—
*
1
1
—
*
1
1
Class 529-F-2
3,183
18,315
21,498
6,761
15,849
22,610
Class 529-F-3
1
7
8
—
*
1
1
Class R-1
186
2,947
3,133
574
2,830
3,404
Class R-2
2,174
34,588
36,762
6,823
32,541
39,364
Class R-2E
484
5,167
5,651
1,244
4,622
5,866
Class R-3
8,400
76,493
84,893
21,734
71,851
93,585
Class R-4
16,636
116,059
132,695
41,487
114,114
155,601
Class R-5E
3,817
22,338
26,155
10,148
24,368
34,516
Class R-5
5,159
29,298
34,457
12,813
30,264
43,077
Class R-6
320,464
1,751,219
2,071,683
701,854
1,570,015
2,271,869
Total
$1,298,805
$8,035,007
$9,333,812
$2,937,549
$7,319,913
$10,257,462
*
Amount less than one thousand.
7. Fees and transactions with related parties
CRMC, the fund’s investment adviser, is the parent company of Capital Client Group, Inc. (“CCG”), the principal underwriter of the fund’s shares, and American Funds Service Company® (“AFS”), the fund’s transfer agent. CRMC, CCG and AFS are considered related parties to the fund.
Investment advisory services — The fund has an investment advisory and service agreement with CRMC that provides for monthly fees accrued daily. These fees are based on a series of decreasing annual rates beginning with 0.342% on the first $3 billion of daily net assets and decreasing to 0.2075% on such assets in excess of $187 billion. For the six months ended October 31, 2024, the investment advisory services fees were $207,585,000, which were equivalent to an annualized rate of 0.222% of average daily net assets.
 
Washington Mutual Investors Fund
14
Class-specific fees and expenses — Expenses that are specific to individual share classes are accrued directly to the respective share class. The principal class-specific fees and expenses are further described below:
Distribution services — The fund has plans of distribution for all share classes, except Class F-2, F-3, 529-F-2, 529-F-3, R-5E, R-5 and R-6 shares. Under the plans, the board of trustees approves certain categories of expenses that are used to finance activities primarily intended to sell fund shares and service existing accounts. The plans provide for payments, based on an annualized percentage of average daily net assets, ranging from 0.25% to 1.00% as noted in this section. In some cases, the board of trustees has limited the amounts that may be paid to less than the maximum allowed by the plans. All share classes with a plan may use up to 0.25% of average daily net assets to pay service fees, or to compensate CCG for paying service fees, to firms that have entered into agreements with CCG to provide certain shareholder services. The remaining amounts available to be paid under each plan are paid to dealers to compensate them for their sales activities. 
Share class
Currently approved limits
Plan limits
Class A
0.25
%
0.25
%
Class 529-A
0.25
0.50
Classes C, 529-C and R-1
1.00
1.00
Class R-2
0.75
1.00
Class R-2E
0.60
0.85
Classes 529-E and R-3
0.50
0.75
Classes T, F-1, 529-T, 529-F-1 and R-4
0.25
0.50
For Class A and 529-A shares, distribution-related expenses include the reimbursement of dealer and wholesaler commissions paid by CCG for certain shares sold without a sales charge. These share classes reimburse CCG for amounts billed within the prior 15 months but only to the extent that the overall annual expense limits are not exceeded. As of October 31, 2024, there were no unreimbursed expenses subject to reimbursement for Class A or 529-A shares.
Transfer agent services — The fund has a shareholder services agreement with AFS under which the fund compensates AFS for providing transfer agent services to each of the fund’s share classes. These services include recordkeeping, shareholder communications and transaction processing. Under this agreement, the fund also pays sub-transfer agency fees to AFS. These fees are paid by AFS to third parties for performing transfer agent services on behalf of fund shareholders.
Administrative services — The fund has an administrative services agreement with CRMC under which the fund compensates CRMC for providing administrative services to all share classes. Administrative services are provided by CRMC and its affiliates to help assist third parties providing non-distribution services to fund shareholders. These services include providing in-depth information on the fund and market developments that impact fund investments. Administrative services also include, but are not limited to, coordinating, monitoring and overseeing third parties that provide services to fund shareholders. The agreement provides the fund the ability to charge an administrative services fee at the annual rate of 0.05% of the average daily net assets attributable to each share class of the fund. Currently the fund pays CRMC an administrative services fee at the annual rate of 0.03% of the average daily net assets attributable to each share class of the fund for CRMC’s provision of administrative services.
529 plan services — Each 529 share class is subject to service fees to compensate the Commonwealth Savers Plan (formerly, Virginia529) for its oversight and administration of the CollegeAmerica 529 college savings plan. The fees are based on the combined net assets invested in Class 529 and ABLE shares of the American Funds. Class ABLE shares are offered on other American Funds by Commonwealth Savers Plan through ABLEAmerica®, a tax-advantaged savings program for individuals with disabilities. Commonwealth Savers Plan is not considered a related party to the fund.
The quarterly fees are based on a series of decreasing annual rates beginning with 0.09% on the first $20 billion of the combined net assets invested in the American Funds and decreasing to 0.03% on such assets in excess of $75 billion. The fees for any given calendar quarter are accrued and calculated on the basis of the average net assets of Class 529 and ABLE shares of the American Funds for the last month of the prior calendar quarter. For the six months ended October 31, 2024, the 529 plan services fees were $1,123,000, which were equivalent to 0.055% of the average daily net assets of each 529 share class.
 
15
Washington Mutual Investors Fund
For the six months ended October 31, 2024, class-specific expenses under the agreements were as follows (dollars in thousands): 
Share class
Distribution
services
Transfer agent
services
Administrative
services
529 plan
services
Class A
$104,771
$23,988
$12,984
Not applicable
Class C
6,953
387
211
Not applicable
Class T
—
—
*
—
*
Not applicable
Class F-1
2,796
1,333
340
Not applicable
Class F-2
Not applicable
18,928
5,167
Not applicable
Class F-3
Not applicable
61
1,611
Not applicable
Class 529-A
3,976
888
520
$953
Class 529-C
386
21
12
22
Class 529-E
275
15
17
30
Class 529-T
—
—
*
—
*
—
*
Class 529-F-1
—
—
*
—
*
—
*
Class 529-F-2
Not applicable
77
64
118
Class 529-F-3
Not applicable
—
*
—
*
—
*
Class R-1
332
29
10
Not applicable
Class R-2
2,930
1,310
117
Not applicable
Class R-2E
357
117
18
Not applicable
Class R-3
4,350
1,268
261
Not applicable
Class R-4
3,323
1,277
400
Not applicable
Class R-5E
Not applicable
404
81
Not applicable
Class R-5
Not applicable
167
101
Not applicable
Class R-6
Not applicable
229
6,097
Not applicable
 
Total class-specific expenses
$130,449
$50,499
$28,011
$1,123
*
Amount less than one thousand.
Board members’ deferred compensation — Board members who are unaffiliated with CRMC may elect to defer the cash payment of part or all of their compensation. These deferred amounts, which remain as liabilities of the fund, are treated as if invested in shares of the fund or other American Funds. These amounts represent general, unsecured liabilities of the fund and vary according to the total returns of the selected funds. Board members’ compensation of $1,971,000 in the fund’s statement of operations reflects $525,000 in current fees (either paid in cash or deferred) and a net increase of $1,446,000 in the value of the deferred amounts.
Affiliated officers and trustees — Officers and certain trustees of the fund are or may be considered to be affiliated with CRMC, CCG and AFS. No affiliated officers or trustees received any compensation directly from the fund.
Investment in CCF — The fund holds shares of CCF, an institutional prime money market fund managed by CRMC. CCF invests in high-quality, short-term money market instruments. CCF is used as the primary investment vehicle for the fund’s short-term instruments. CCF shares are only available for purchase by CRMC, its affiliates, and other funds managed by CRMC or its affiliates, and are not available to the public. CRMC does not receive an investment advisory services fee from CCF.
Security transactions with related funds — The fund purchased investment securities from, and sold investment securities to, other funds managed by CRMC (or funds managed by certain affiliates of CRMC) under procedures adopted by the fund’s board of trustees. The funds involved in such transactions are considered related by virtue of having a common investment adviser (or affiliated investment advisers), common trustees and/or common officers. Each transaction was executed at the current market price of the security and no brokerage commissions or fees were paid in accordance with Rule 17a-7 of the 1940 Act. During the six months ended October 31, 2024, the fund engaged in such purchase and sale transactions with related funds in the amounts of $844,300,000 and $267,795,000, respectively, which generated $29,227,000 of net realized gains from such sales.
Interfund lending — Pursuant to an exemptive order issued by the SEC, the fund, along with other CRMC-managed funds (or funds managed by certain affiliates of CRMC), may participate in an interfund lending program. The program provides an alternate credit facility that permits the funds to lend or borrow cash for temporary purposes directly to or from one another, subject to the conditions of the exemptive order. The fund did not lend or borrow cash through the interfund lending program at any time during the six months ended October 31, 2024.
 
Washington Mutual Investors Fund
16
8. Indemnifications
The fund’s organizational documents provide board members and officers with indemnification against certain liabilities or expenses in connection with the performance of their duties to the fund. In the normal course of business, the fund may also enter into contracts that provide general indemnifications. The fund’s maximum exposure under these arrangements is unknown since it is dependent on future claims that may be made against the fund. The risk of material loss from such claims is considered remote. Insurance policies are also available to the fund’s board members and officers.
9. Capital share transactions
Capital share transactions in the fund were as follows (dollars and shares in thousands):
 
 
Sales*
Reinvestments of
distributions
Repurchases*
Net increase
(decrease)
Share class
Amount
Shares
Amount
Shares
Amount
Shares
Amount
Shares
Six months ended October 31, 2024
Class A
$1,807,337
29,040
$4,205,506
70,062
$(4,642,513
)
(74,722
)
$1,370,330
24,380
Class C
81,313
1,331
65,625
1,115
(182,032
)
(2,984
)
(35,094
)
(538
)
Class T
—
—
—
—
—
—
—
—
Class F-1
71,977
1,169
110,696
1,854
(160,869
)
(2,607
)
21,804
416
Class F-2
2,910,134
46,967
1,699,247
28,344
(3,853,523
)
(62,054
)
755,858
13,257
Class F-3
1,261,513
20,226
533,504
8,890
(980,755
)
(15,804
)
814,262
13,312
Class 529-A
143,244
2,307
171,847
2,873
(267,047
)
(4,319
)
48,044
861
Class 529-C
7,470
121
3,702
63
(17,162
)
(279
)
(5,990
)
(95
)
Class 529-E
5,843
95
5,435
92
(10,339
)
(169
)
939
18
Class 529-T
—
—
1
—
†
—
—
1
—
†
Class 529-F-1
—
—
1
—
†
—
—
1
—
†
Class 529-F-2
35,970
578
21,495
358
(39,805
)
(640
)
17,660
296
Class 529-F-3
23
1
8
—
†
(69
)
(1
)
(38
)
—
†
Class R-1
3,429
56
3,132
53
(6,095
)
(99
)
466
10
Class R-2
50,539
829
36,758
626
(91,489
)
(1,500
)
(4,192
)
(45
)
Class R-2E
9,903
162
5,651
95
(14,710
)
(239
)
844
18
Class R-3
109,276
1,778
84,784
1,431
(212,060
)
(3,453
)
(18,000
)
(244
)
Class R-4
97,578
1,582
132,680
2,229
(266,953
)
(4,333
)
(36,695
)
(522
)
Class R-5E
60,766
986
26,151
436
(44,340
)
(715
)
42,577
707
Class R-5
25,119
404
34,163
569
(86,523
)
(1,394
)
(27,241
)
(421
)
Class R-6
1,367,697
22,051
2,071,329
34,479
(2,512,710
)
(40,472
)
926,316
16,058
Total net increase
(decrease)
$8,049,131
129,683
$9,211,715
153,569
$(13,388,994
)
(215,784
)
$3,871,852
67,468
Refer to the end of the table for footnotes.
 
17
Washington Mutual Investors Fund
 
Sales*
Reinvestments of
distributions
Repurchases*
Net increase
(decrease)
Share class
Amount
Shares
Amount
Shares
Amount
Shares
Amount
Shares
Year ended April 30, 2024
Class A
$3,665,274
65,121
$4,615,092
83,465
$(8,129,220
)
(144,910
)
$151,146
3,676
Class C
166,846
3,016
73,874
1,363
(370,783
)
(6,706
)
(130,063
)
(2,327
)
Class T
—
—
—
—
—
—
—
—
Class F-1
109,754
1,966
129,064
2,349
(441,124
)
(7,978
)
(202,306
)
(3,663
)
Class F-2
4,986,562
88,863
1,863,182
33,718
(5,937,917
)
(106,023
)
911,827
16,558
Class F-3
1,766,211
31,453
568,662
10,280
(1,772,662
)
(31,582
)
562,211
10,151
Class 529-A
273,594
4,879
189,283
3,435
(497,288
)
(8,905
)
(34,411
)
(591
)
Class 529-C
16,189
291
4,386
80
(35,263
)
(636
)
(14,688
)
(265
)
Class 529-E
7,418
134
6,062
111
(18,767
)
(340
)
(5,287
)
(95
)
Class 529-T
—
—
1
—
†
—
—
1
—
†
Class 529-F-1
—
—
1
—
†
—
—
1
—
†
Class 529-F-2
66,907
1,190
22,603
408
(63,302
)
(1,130
)
26,208
468
Class 529-F-3
130
2
1
—
†
—
—
131
2
Class R-1
6,394
116
3,376
62
(15,302
)
(280
)
(5,532
)
(102
)
Class R-2
116,286
2,122
39,336
728
(175,588
)
(3,195
)
(19,966
)
(345
)
Class R-2E
19,210
343
5,866
107
(23,814
)
(428
)
1,262
22
Class R-3
213,728
3,855
93,480
1,712
(353,972
)
(6,392
)
(46,764
)
(825
)
Class R-4
204,112
3,638
155,574
2,837
(583,273
)
(10,490
)
(223,587
)
(4,015
)
Class R-5E
98,373
1,745
34,515
625
(225,601
)
(3,841
)
(92,713
)
(1,471
)
Class R-5
59,677
1,059
42,729
775
(203,281
)
(3,655
)
(100,875
)
(1,821
)
Class R-6
3,122,527
55,403
2,271,459
41,030
(4,615,918
)
(82,803
)
778,068
13,630
Total net increase
(decrease)
$14,899,192
265,196
$10,118,546
183,085
$(23,463,075
)
(419,294
)
$1,554,663
28,987
*
Includes exchanges between share classes of the fund.
†
Amount less than one thousand.
10. Investment transactions
The fund engaged in purchases and sales of investment securities, excluding short-term securities and U.S. government obligations,
if any, of $21,752,273,000 and $24,657,210,000, respectively, during the six months ended October 31, 2024.
 
Washington Mutual Investors Fund
18
Financial highlights
 
 
 
Income (loss) from investment operations1
Dividends and distributions
 
 
 
 
 
 
Year ended
Net asset
value,
beginning
of year
Net
investment
income
(loss)
Net gains
(losses) on
securities
(both
realized and
unrealized)
Total from
investment
operations
Dividends
(from net
investment
income)
Distributions
(from capital
gains)
Total
dividends
and
distributions
Net asset
value,
end
of year
Total return2,3
Net assets,
end of
year
(in millions)
Ratio of
expenses to
average net
assets before
reimburse-
ments4
Ratio of
expenses to
average net
assets after
reimburse-
ments3,4
Ratio of
net income
(loss) to
average
net assets3
 
Class A:
10/31/20245,6
$59.84
$.45
$6.51
$6.96
$(.41
)
$(2.77
)
$(3.18
)
$63.62
11.97
%7
$87,462
.56
%8
.56
%8
1.45
%8
4/30/2024
53.38
.95
9.02
9.97
(.96
)
(2.55
)
(3.51
)
59.84
19.36
80,801
.57
.57
1.69
4/30/2023
55.52
1.00
.15
1.15
(1.02
)
(2.27
)
(3.29
)
53.38
2.45
71,892
.57
.57
1.91
4/30/2022
56.35
.92
1.91
2.83
(.85
)
(2.81
)
(3.66
)
55.52
4.98
72,922
.57
.57
1.59
4/30/2021
41.94
.83
15.12
15.95
(.87
)
(.67
)
(1.54
)
56.35
38.63
71,469
.58
.58
1.73
4/30/2020
46.68
.88
(2.36
)
(1.48
)
(.88
)
(2.38
)
(3.26
)
41.94
(3.63
)
54,235
.58
.58
1.93
Class C:
10/31/20245,6
58.75
.22
6.38
6.60
(.18
)
(2.77
)
(2.95
)
62.40
11.55
7
1,390
1.31
8
1.31
8
.70
8
4/30/2024
52.48
.52
8.84
9.36
(.54
)
(2.55
)
(3.09
)
58.75
18.43
1,340
1.32
1.32
.94
4/30/2023
54.62
.60
.15
.75
(.62
)
(2.27
)
(2.89
)
52.48
1.71
1,319
1.32
1.32
1.16
4/30/2022
55.48
.48
1.89
2.37
(.42
)
(2.81
)
(3.23
)
54.62
4.20
1,452
1.32
1.32
.84
4/30/2021
41.33
.47
14.87
15.34
(.52
)
(.67
)
(1.19
)
55.48
37.56
1,509
1.33
1.33
.99
4/30/2020
46.01
.54
(2.31
)
(1.77
)
(.53
)
(2.38
)
(2.91
)
41.33
(4.33
)
1,497
1.33
1.33
1.19
Class T:
10/31/20245,6
59.82
.53
6.52
7.05
(.49
)
(2.77
)
(3.26
)
63.61
12.14
7,9
—
10
.31
8,9
.31
8,9
1.69
8,9
4/30/2024
53.38
1.09
9.00
10.09
(1.10
)
(2.55
)
(3.65
)
59.82
19.62
9
—
10
.32
9
.32
9
1.94
9
4/30/2023
55.51
1.14
.15
1.29
(1.15
)
(2.27
)
(3.42
)
53.38
2.75
9
—
10
.30
9
.30
9
2.17
9
4/30/2022
56.34
1.06
1.92
2.98
(1.00
)
(2.81
)
(3.81
)
55.51
5.25
9
—
10
.32
9
.32
9
1.84
9
4/30/2021
41.93
.95
15.12
16.07
(.99
)
(.67
)
(1.66
)
56.34
38.96
9
—
10
.33
9
.33
9
1.98
9
4/30/2020
46.68
1.00
(2.38
)
(1.38
)
(.99
)
(2.38
)
(3.37
)
41.93
(3.39
)9
—
10
.34
9
.34
9
2.18
9
Class F-1:
10/31/20245,6
59.53
.43
6.47
6.90
(.39
)
(2.77
)
(3.16
)
63.27
11.92
7
2,286
.63
8
.63
8
1.38
8
4/30/2024
53.12
.91
8.97
9.88
(.92
)
(2.55
)
(3.47
)
59.53
19.28
2,126
.63
.63
1.64
4/30/2023
55.26
.97
.15
1.12
(.99
)
(2.27
)
(3.26
)
53.12
2.40
2,092
.63
.63
1.85
4/30/2022
56.10
.88
1.90
2.78
(.81
)
(2.81
)
(3.62
)
55.26
4.91
2,216
.63
.63
1.52
4/30/2021
41.76
.80
15.05
15.85
(.84
)
(.67
)
(1.51
)
56.10
38.53
2,422
.64
.64
1.68
4/30/2020
46.49
.85
(2.35
)
(1.50
)
(.85
)
(2.38
)
(3.23
)
41.76
(3.68
)
2,529
.64
.64
1.88
Class F-2:
10/31/20245,6
59.76
.51
6.50
7.01
(.47
)
(2.77
)
(3.24
)
63.53
12.08
7
35,015
.37
8
.37
8
1.64
8
4/30/2024
53.32
1.06
9.00
10.06
(1.07
)
(2.55
)
(3.62
)
59.76
19.57
32,142
.37
.37
1.89
4/30/2023
55.46
1.10
.15
1.25
(1.12
)
(2.27
)
(3.39
)
53.32
2.67
27,795
.37
.37
2.10
4/30/2022
56.29
1.03
1.92
2.95
(.97
)
(2.81
)
(3.78
)
55.46
5.18
28,561
.37
.37
1.78
4/30/2021
41.89
.93
15.11
16.04
(.97
)
(.67
)
(1.64
)
56.29
38.91
26,849
.37
.37
1.93
4/30/2020
46.64
.97
(2.37
)
(1.40
)
(.97
)
(2.38
)
(3.35
)
41.89
(3.44
)
18,175
.39
.39
2.13
Class F-3:
10/31/20245,6
59.80
.55
6.50
7.05
(.50
)
(2.77
)
(3.27
)
63.58
12.14
7
11,231
.26
8
.26
8
1.74
8
4/30/2024
53.35
1.12
9.01
10.13
(1.13
)
(2.55
)
(3.68
)
59.80
19.71
9,767
.26
.26
2.00
4/30/2023
55.49
1.16
.15
1.31
(1.18
)
(2.27
)
(3.45
)
53.35
2.77
8,172
.26
.26
2.21
4/30/2022
56.32
1.09
1.92
3.01
(1.03
)
(2.81
)
(3.84
)
55.49
5.30
7,842
.26
.26
1.89
4/30/2021
41.91
.99
15.10
16.09
(1.01
)
(.67
)
(1.68
)
56.32
39.07
6,969
.27
.27
2.03
4/30/2020
46.66
1.02
(2.37
)
(1.35
)
(1.02
)
(2.38
)
(3.40
)
41.91
(3.33
)
4,154
.27
.27
2.24
Class 529-A:
10/31/20245,6
59.64
.44
6.50
6.94
(.40
)
(2.77
)
(3.17
)
63.41
11.98
7
3,499
.60
8
.60
8
1.41
8
4/30/2024
53.22
.93
8.98
9.91
(.94
)
(2.55
)
(3.49
)
59.64
19.29
3,240
.61
.61
1.66
4/30/2023
55.36
.98
.15
1.13
(1.00
)
(2.27
)
(3.27
)
53.22
2.42
2,923
.61
.61
1.87
4/30/2022
56.20
.89
1.91
2.80
(.83
)
(2.81
)
(3.64
)
55.36
4.94
2,952
.60
.60
1.55
4/30/2021
41.83
.81
15.08
15.89
(.85
)
(.67
)
(1.52
)
56.20
38.58
2,887
.62
.62
1.69
4/30/2020
46.56
.86
(2.35
)
(1.49
)
(.86
)
(2.38
)
(3.24
)
41.83
(3.66
)
2,142
.63
.63
1.89
Refer to the end of the table for footnotes.
 
19
Washington Mutual Investors Fund
Financial highlights (continued)
 
 
Income (loss) from investment operations1
Dividends and distributions
 
 
 
 
 
 
Year ended
Net asset
value,
beginning
of year
Net
investment
income
(loss)
Net gains
(losses) on
securities
(both
realized and
unrealized)
Total from
investment
operations
Dividends
(from net
investment
income)
Distributions
(from capital
gains)
Total
dividends
and
distributions
Net asset
value,
end
of year
Total return2,3
Net assets,
end of
year
(in millions)
Ratio of
expenses to
average net
assets before
reimburse-
ments4
Ratio of
expenses to
average net
assets after
reimburse-
ments3,4
Ratio of
net income
(loss) to
average
net assets3
Class 529-C:
10/31/20245,6
$59.22
$.21
$6.44
$6.65
$(.16
)
$(2.77
)
$(2.93
)
$62.94
11.55
%7
$76
1.35
%8
1.35
%8
.66
%8
4/30/2024
52.87
.50
8.90
9.40
(.50
)
(2.55
)
(3.05
)
59.22
18.37
77
1.37
1.37
.90
4/30/2023
54.99
.57
.16
.73
(.58
)
(2.27
)
(2.85
)
52.87
1.64
83
1.38
1.38
1.10
4/30/2022
55.84
.45
1.90
2.35
(.39
)
(2.81
)
(3.20
)
54.99
4.14
93
1.36
1.36
.79
4/30/2021
41.56
.48
14.96
15.44
(.49
)
(.67
)
(1.16
)
55.84
37.57
109
1.35
1.35
1.02
4/30/2020
46.25
.53
(2.33
)
(1.80
)
(.51
)
(2.38
)
(2.89
)
41.56
(4.38
)
216
1.36
1.36
1.16
Class 529-E:
10/31/20245,6
59.16
.36
6.43
6.79
(.32
)
(2.77
)
(3.09
)
62.86
11.82
7
112
.84
8
.84
8
1.17
8
4/30/2024
52.82
.78
8.91
9.69
(.80
)
(2.55
)
(3.35
)
59.16
19.01
105
.85
.85
1.41
4/30/2023
54.96
.84
.16
1.00
(.87
)
(2.27
)
(3.14
)
52.82
2.17
98
.85
.85
1.62
4/30/2022
55.82
.75
1.89
2.64
(.69
)
(2.81
)
(3.50
)
54.96
4.69
103
.85
.85
1.31
4/30/2021
41.56
.70
14.98
15.68
(.75
)
(.67
)
(1.42
)
55.82
38.27
107
.85
.85
1.47
4/30/2020
46.27
.75
(2.33
)
(1.58
)
(.75
)
(2.38
)
(3.13
)
41.56
(3.89
)
88
.86
.86
1.66
Class 529-T:
10/31/20245,6
59.83
.51
6.51
7.02
(.47
)
(2.77
)
(3.24
)
63.61
12.07
7,9
—
10
.37
8,9
.37
8,9
1.64
8,9
4/30/2024
53.38
1.06
9.01
10.07
(1.07
)
(2.55
)
(3.62
)
59.83
19.56
9
—
10
.37
9
.37
9
1.88
9
4/30/2023
55.51
1.11
.16
1.27
(1.13
)
(2.27
)
(3.40
)
53.38
2.69
9
—
10
.36
9
.36
9
2.11
9
4/30/2022
56.34
1.03
1.91
2.94
(.96
)
(2.81
)
(3.77
)
55.51
5.18
9
—
10
.38
9
.38
9
1.77
9
4/30/2021
41.93
.93
15.11
16.04
(.96
)
(.67
)
(1.63
)
56.34
38.90
9
—
10
.38
9
.38
9
1.92
9
4/30/2020
46.68
.97
(2.37
)
(1.40
)
(.97
)
(2.38
)
(3.35
)
41.93
(3.44
)9
—
10
.38
9
.38
9
2.14
9
Class 529-F-1:
10/31/20245,6
59.40
.49
6.47
6.96
(.45
)
(2.77
)
(3.22
)
63.14
12.07
7,9
—
10
.44
8,9
.44
8,9
1.57
8,9
4/30/2024
53.02
1.02
8.94
9.96
(1.03
)
(2.55
)
(3.58
)
59.40
19.49
9
—
10
.43
9
.43
9
1.83
9
4/30/2023
55.17
1.06
.15
1.21
(1.09
)
(2.27
)
(3.36
)
53.02
2.59
9
—
10
.44
9
.44
9
2.03
9
4/30/2022
56.01
.99
1.90
2.89
(.92
)
(2.81
)
(3.73
)
55.17
5.13
9
—
10
.43
9
.43
9
1.72
9
4/30/2021
41.70
.84
15.10
15.94
(.96
)
(.67
)
(1.63
)
56.01
38.87
9
—
10
.40
9
.40
9
1.88
9
4/30/2020
46.44
.96
(2.35
)
(1.39
)
(.97
)
(2.38
)
(3.35
)
41.70
(3.45
)
192
.40
.40
2.12
Class 529-F-2:
10/31/20245,6
59.83
.52
6.50
7.02
(.47
)
(2.77
)
(3.24
)
63.61
12.09
7
438
.35
8
.35
8
1.65
8
4/30/2024
53.38
1.07
9.01
10.08
(1.08
)
(2.55
)
(3.63
)
59.83
19.59
395
.36
.36
1.90
4/30/2023
55.52
1.11
.15
1.26
(1.13
)
(2.27
)
(3.40
)
53.38
2.71
327
.34
.34
2.13
4/30/2022
56.34
1.04
1.92
2.96
(.97
)
(2.81
)
(3.78
)
55.52
5.19
303
.36
.36
1.79
4/30/20215,11
44.47
.50
12.55
13.05
(.51
)
(.67
)
(1.18
)
56.34
29.66
7
269
.38
8
.38
8
1.95
8
Class 529-F-3:
10/31/20245,6
59.82
.53
6.51
7.04
(.48
)
(2.77
)
(3.25
)
63.61
12.13
7
—
10
.32
8
.32
8
1.70
8
4/30/2024
53.37
.95
9.15
10.10
(1.10
)
(2.55
)
(3.65
)
59.82
19.63
—
10
.32
.32
1.66
4/30/2023
55.51
1.13
.15
1.28
(1.15
)
(2.27
)
(3.42
)
53.37
2.72
—
10
.32
.32
2.15
4/30/2022
56.34
1.06
1.92
2.98
(1.00
)
(2.81
)
(3.81
)
55.51
5.25
—
10
.32
.32
1.84
4/30/20215,11
44.47
.51
12.55
13.06
(.52
)
(.67
)
(1.19
)
56.34
29.69
7
—
10
.43
8
.32
8
2.01
8
Class R-1:
10/31/20245,6
58.96
.21
6.40
6.61
(.17
)
(2.77
)
(2.94
)
62.63
11.53
7
67
1.34
8
1.34
8
.67
8
4/30/2024
52.66
.51
8.87
9.38
(.53
)
(2.55
)
(3.08
)
58.96
18.40
63
1.35
1.35
.91
4/30/2023
54.79
.59
.16
.75
(.61
)
(2.27
)
(2.88
)
52.66
1.68
61
1.34
1.34
1.14
4/30/2022
55.64
.46
1.90
2.36
(.40
)
(2.81
)
(3.21
)
54.79
4.18
68
1.35
1.35
.80
4/30/2021
41.45
.46
14.92
15.38
(.52
)
(.67
)
(1.19
)
55.64
37.53
75
1.35
1.35
.96
4/30/2020
46.13
.52
(2.31
)
(1.79
)
(.51
)
(2.38
)
(2.89
)
41.45
(4.37
)
67
1.37
1.37
1.15
Refer to the end of the table for footnotes.
 
Washington Mutual Investors Fund
20
Financial highlights (continued)
 
 
Income (loss) from investment operations1
Dividends and distributions
 
 
 
 
 
 
Year ended
Net asset
value,
beginning
of year
Net
investment
income
(loss)
Net gains
(losses) on
securities
(both
realized and
unrealized)
Total from
investment
operations
Dividends
(from net
investment
income)
Distributions
(from capital
gains)
Total
dividends
and
distributions
Net asset
value,
end
of year
Total return2,3
Net assets,
end of
year
(in millions)
Ratio of
expenses to
average net
assets before
reimburse-
ments4
Ratio of
expenses to
average net
assets after
reimburse-
ments3,4
Ratio of
net income
(loss) to
average
net assets3
Class R-2:
10/31/20245,6
$58.60
$.20
$6.37
$6.57
$(.17
)
$(2.77
)
$(2.94
)
$62.23
11.53
%7
$779
1.35
%8
1.35
%8
.66
%8
4/30/2024
52.36
.50
8.82
9.32
(.53
)
(2.55
)
(3.08
)
58.60
18.40
736
1.35
1.35
.91
4/30/2023
54.51
.58
.15
.73
(.61
)
(2.27
)
(2.88
)
52.36
1.67
675
1.36
1.36
1.12
4/30/2022
55.38
.45
1.89
2.34
(.40
)
(2.81
)
(3.21
)
54.51
4.15
701
1.35
1.35
.80
4/30/2021
41.26
.45
14.85
15.30
(.51
)
(.67
)
(1.18
)
55.38
37.54
739
1.37
1.37
.94
4/30/2020
45.94
.52
(2.31
)
(1.79
)
(.51
)
(2.38
)
(2.89
)
41.26
(4.37
)
611
1.37
1.37
1.15
Class R-2E:
10/31/20245,6
59.44
.30
6.47
6.77
(.26
)
(2.77
)
(3.03
)
63.18
11.71
7
119
1.06
8
1.06
8
.95
8
4/30/2024
53.06
.67
8.95
9.62
(.69
)
(2.55
)
(3.24
)
59.44
18.74
110
1.06
1.06
1.20
4/30/2023
55.19
.74
.16
.90
(.76
)
(2.27
)
(3.03
)
53.06
1.97
98
1.06
1.06
1.41
4/30/2022
56.03
.63
1.90
2.53
(.56
)
(2.81
)
(3.37
)
55.19
4.47
95
1.06
1.06
1.09
4/30/2021
41.72
.59
15.03
15.62
(.64
)
(.67
)
(1.31
)
56.03
37.92
98
1.08
1.08
1.24
4/30/2020
46.43
.66
(2.34
)
(1.68
)
(.65
)
(2.38
)
(3.03
)
41.72
(4.09
)
92
1.07
1.07
1.45
Class R-3:
10/31/20245,6
59.12
.34
6.43
6.77
(.30
)
(2.77
)
(3.07
)
62.82
11.79
7
1,730
.91
8
.91
8
1.10
8
4/30/2024
52.79
.75
8.90
9.65
(.77
)
(2.55
)
(3.32
)
59.12
18.93
1,642
.91
.91
1.35
4/30/2023
54.93
.81
.15
.96
(.83
)
(2.27
)
(3.10
)
52.79
2.11
1,510
.91
.91
1.56
4/30/2022
55.78
.71
1.90
2.61
(.65
)
(2.81
)
(3.46
)
54.93
4.64
1,663
.91
.91
1.24
4/30/2021
41.54
.66
14.96
15.62
(.71
)
(.67
)
(1.38
)
55.78
38.13
1,904
.92
.92
1.39
4/30/2020
46.24
.72
(2.32
)
(1.60
)
(.72
)
(2.38
)
(3.10
)
41.54
(3.94
)
1,604
.92
.92
1.60
Class R-4:
10/31/20245,6
59.39
.44
6.45
6.89
(.39
)
(2.77
)
(3.16
)
63.12
11.96
7
2,652
.61
8
.61
8
1.40
8
4/30/2024
53.01
.92
8.95
9.87
(.94
)
(2.55
)
(3.49
)
59.39
19.29
2,526
.61
.61
1.66
4/30/2023
55.15
.97
.15
1.12
(.99
)
(2.27
)
(3.26
)
53.01
2.42
2,468
.61
.61
1.87
4/30/2022
55.99
.89
1.90
2.79
(.82
)
(2.81
)
(3.63
)
55.15
4.94
2,738
.61
.61
1.54
4/30/2021
41.68
.81
15.02
15.83
(.85
)
(.67
)
(1.52
)
55.99
38.57
3,322
.62
.62
1.69
4/30/2020
46.41
.86
(2.35
)
(1.49
)
(.86
)
(2.38
)
(3.24
)
41.68
(3.67
)
2,874
.62
.62
1.90
Class R-5E:
10/31/20245,6
59.70
.50
6.49
6.99
(.45
)
(2.77
)
(3.22
)
63.47
12.07
7
557
.41
8
.41
8
1.59
8
4/30/2024
53.27
1.04
8.99
10.03
(1.05
)
(2.55
)
(3.60
)
59.70
19.52
482
.41
.41
1.86
4/30/2023
55.41
1.08
.15
1.23
(1.10
)
(2.27
)
(3.37
)
53.27
2.61
508
.41
.41
2.06
4/30/2022
56.25
1.00
1.91
2.91
(.94
)
(2.81
)
(3.75
)
55.41
5.14
485
.41
.41
1.74
4/30/2021
41.86
.92
15.09
16.01
(.95
)
(.67
)
(1.62
)
56.25
38.88
536
.41
.41
1.89
4/30/2020
46.61
.95
(2.35
)
(1.40
)
(.97
)
(2.38
)
(3.35
)
41.86
(3.45
)
292
.41
.41
2.11
Class R-5:
10/31/20245,6
59.80
.53
6.52
7.05
(.49
)
(2.77
)
(3.26
)
63.59
12.13
7
663
.31
8
.31
8
1.70
8
4/30/2024
53.36
1.09
9.00
10.09
(1.10
)
(2.55
)
(3.65
)
59.80
19.62
648
.31
.31
1.95
4/30/2023
55.49
1.14
.15
1.29
(1.15
)
(2.27
)
(3.42
)
53.36
2.73
676
.31
.31
2.17
4/30/2022
56.32
1.06
1.92
2.98
(1.00
)
(2.81
)
(3.81
)
55.49
5.25
815
.31
.31
1.84
4/30/2021
41.91
.96
15.11
16.07
(.99
)
(.67
)
(1.66
)
56.32
39.00
1,005
.32
.32
2.00
4/30/2020
46.66
1.01
(2.38
)
(1.37
)
(1.00
)
(2.38
)
(3.38
)
41.91
(3.38
)
996
.32
.32
2.20
Class R-6:
10/31/20245,6
59.87
.55
6.51
7.06
(.50
)
(2.77
)
(3.27
)
63.66
12.17
7
41,147
.26
8
.26
8
1.74
8
4/30/2024
53.41
1.12
9.02
10.14
(1.13
)
(2.55
)
(3.68
)
59.87
19.70
37,736
.26
.26
2.00
4/30/2023
55.55
1.16
.15
1.31
(1.18
)
(2.27
)
(3.45
)
53.41
2.76
32,937
.26
.26
2.21
4/30/2022
56.38
1.09
1.92
3.01
(1.03
)
(2.81
)
(3.84
)
55.55
5.30
32,755
.26
.26
1.89
4/30/2021
41.96
.99
15.12
16.11
(1.02
)
(.67
)
(1.69
)
56.38
39.04
32,128
.27
.27
2.04
4/30/2020
46.71
1.03
(2.37
)
(1.34
)
(1.03
)
(2.38
)
(3.41
)
41.96
(3.32
)
23,486
.27
.27
2.25
Refer to the end of the table for footnotes.
 
21
Washington Mutual Investors Fund
Financial highlights (continued)
 
 
Six months
ended
October 31,
20245,6,7
Year ended April 30,
2024
2023
2022
2021
2020
Portfolio turnover rate for all share classes12
12
%
31
%
30
%
19
%
24
%
30
%
 
1
Based on average shares outstanding.
2
Total returns exclude any applicable sales charges, including contingent deferred sales charges.
3
This column reflects the impact, if any, of certain reimbursements from CRMC. During one of the years shown, CRMC reimbursed a portion of transfer agent
services fees for Class 529-F-3 shares.
4
Ratios do not include expenses of any Central Funds. The fund indirectly bears its proportionate share of the expenses of any Central Funds.
5
Based on operations for a period that is less than a full year.
6
Unaudited.
7
Not annualized.
8
Annualized.
9
All or a significant portion of assets in this class consisted of seed capital invested by CRMC and/or its affiliates. Fees for distribution services are not charged or
accrued on these seed capital assets. If such fees were paid by the fund on seed capital assets, fund expenses would have been higher and net income and total
return would have been lower.
10
Amount less than $1 million.
11
Class 529-F-2 and 529-F-3 shares began investment operations on October 30, 2020.
12
Rates do not include the fund’s portfolio activity with respect to any Central Funds.
Refer to the notes to financial statements.
 
Washington Mutual Investors Fund
22
Changes in and disagreements with accountants
Not applicable
Matters submitted for shareholder vote
Not applicable
Remuneration paid to directors, officers and others
Refer to information in the financial statements.
Approval of Investment Advisory and Service Agreement
Not applicable
 
23
Washington Mutual Investors Fund


ITEM 8 - Changes in and Disagreements with Accountants for Open-End Management Investment Companies

Not applicable



ITEM 9 - Proxy Disclosures for Open-End Management Investment Companies

Not applicable



ITEM 10 - Remuneration Paid to Directors, Officers, and Others of Open-End Management Investment Companies

The information is included as part of the material filed under Item 7 of this Form.



ITEM 11 - Statement Regarding Basis for Approval of Investment Advisory Contract

Not applicable



ITEM 12 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies

Not applicable to this Registrant, insofar as the Registrant is not a closed-end management investment company.



ITEM 13 - Portfolio Managers of Closed-End Management Investment Companies

Not applicable to this Registrant, insofar as the Registrant is not a closed-end management investment company.



ITEM 14 - Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers

Not applicable to this Registrant, insofar as the Registrant is not a closed-end management investment company.



ITEM 15 - Submission of Matters to a Vote of Security Holders

There have been no material changes to the procedures by which shareholders may recommend nominees to the Registrant’s board of trustees since the Registrant last submitted a proxy statement to its shareholders.  The procedures are as follows.  The Registrant has a nominating and governance committee comprised solely of persons who are not considered ‘‘interested persons’’ of the Registrant within the meaning of the Investment Company Act of 1940, as amended. The committee periodically reviews such issues as the board’s composition, responsibilities, committees, compensation and other relevant issues, and recommends any appropriate changes to the full board of trustees. While the committee normally is able to identify from its own resources an ample number of qualified candidates, it will consider shareholder suggestions of persons to be considered as nominees to fill future vacancies on the board. Such suggestions must be sent in writing to the nominating and governance committee of the Registrant, c/o the Registrant’s Secretary, and must be accompanied by complete biographical and occupational data on the prospective nominee, along with a written consent of the prospective nominee for consideration of his or her name by the nominating and governance committee.



ITEM 16 - Controls and Procedures

(a) The Registrant’s Principal Executive Officer and Principal Financial Officer have concluded, based on their evaluation of the Registrant’s disclosure controls and procedures (as such term is defined in Rule 30a-3 under the Investment Company Act of 1940), that such controls and procedures are adequate and reasonably designed to achieve the purposes described in paragraph (c) of such rule.

(b) There were no changes in the Registrant’s internal controls over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) that occurred during the Registrant’s semi-annual period covered by this report that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting.



ITEM 17 - Disclosure of Securities Lending Activities for Closed-End Management Investment Companies

Not applicable to this Registrant, insofar as the Registrant is not a closed-end management investment company.



ITEM 18 - Recovery of Erroneously Awarded Compensation

Not applicable



 

ITEM 19 - Exhibits

(a)(1) Not applicable for filing of semi-annual reports to shareholders.

(a)(2) The certifications required by Rule 30a-2 of the Investment Company Act of 1940 and Sections 302 and 906 of the Sarbanes-Oxley Act of 2002 are attached as exhibits hereto.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Washington Mutual Investors Fund

By   /s/ Michael W. Stockton

Michael W. Stockton,

Executive Vice President and Principal Executive Officer

Date: January 07, 2025

 

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

By   /s/ Michael W. Stockton

Michael W. Stockton,

Executive Vice President and Principal Executive Officer

Date: January 07, 2025

 

By   /s/ Hong T. Le

Hong T. Le, Treasurer and

Principal Financial Officer

Date: January 07, 2025

 
 

CERTIFICATION

I, Michael W. Stockton, certify that:

1.I have reviewed this report on Form N-CSR of Washington Mutual Investors Fund;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in rule 30a-3(c) under the Investment Company Act of 1940) and internal controls over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of trustees (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: January 07, 2025

/s/ Michael W. Stockton Michael W. Stockton,

Executive Vice President and Principal Executive Officer

Washington Mutual Investors Fund

CERTIFICATION

I, Hong T. Le, certify that:

1.I have reviewed this report on Form N-CSR of Washington Mutual Investors Fund;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in rule 30a-3(c) under the Investment Company Act of 1940) and internal controls over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of trustees (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: January 07, 2025

/s/ Hong T. Le Hong T. Le,

Treasurer and Principal Financial Officer

Washington Mutual Investors Fund



CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

MICHAEL W. STOCKTON, Executive Vice President and Principal Executive Officer, and HONG T. LE, Treasurer and Principal Financial Officer of Washington Mutual Investors Fund (the "Registrant"), each certify to the best of her or his knowledge that:

1.The Registrant's periodic report on Form N-CSR for the period ended October 31, 2024 (the "Form N-CSR") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Form N-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Principal Executive Officer

Washington Mutual Investors Fund

/s/ Michael W. Stockton

Michael W. Stockton, Executive Vice President and Principal Executive Officer

Date: January 07, 2025

Principal Financial Officer

Washington Mutual Investors Fund

/s/ Hong T. Le

Hong T. Le, Treasurer and Principal Financial Officer

Date: January 07, 2025

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Washington Mutual Investors Fund and will be retained by Washington Mutual Investors Fund and furnished to the Securities and Exchange Commission (the "Commission") or its staff upon request.

This certification is being furnished to the Commission solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Form N-CSR filed with the Commission.



v3.24.4
Form N-CSR Cover
 6 Months Ended
Oct. 31, 2024
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Washington Mutual Investors Fund
Entity Central Index Key 0000104865
Entity Investment Company Type N-1A
Document Period End Date Oct. 31, 2024

v3.24.4
Shareholder Report
 6 Months Ended
Oct. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Washington Mutual Investors Fund
Entity Central Index Key 0000104865
Entity Investment Company Type N-1A
Document Period End Date Oct. 31, 2024
Washington Mutual Investors Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class A
Trading Symbol AWSHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-A
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-A
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$
30		0.56
%
*
*Annualized.
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.56% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class C
Trading Symbol WSHCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-C
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-C
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$
70		1.31
%
*
*Annualized.
Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.31% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of n
e
t assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class T  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class T
Trading Symbol TWMMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class T
$
17		0.31
%
*
*Annualized.
Expenses Paid, Amount $ 17
Expense Ratio, Percent 0.31% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class F-1  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class F-1
Trading Symbol WSHFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-F1
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-F1
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-1
$
34		0.63
%
*
*Annualized.
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.63% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class F-2  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class F-2
Trading Symbol WMFFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-F2
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-F2
Expenses [Text Block]
What were t
he
fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-2
$
20		0.37
%
*
*Annualized.
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.37% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class F-3  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class F-3
Trading Symbol FWMIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-F3
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-F3
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 inves
t
ment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-3
$
14		0.26
%
*
*Annualized.
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.26% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund Class 529-A  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class 529-A
Trading Symbol CWMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529A
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-529A
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-A
$
32		0.60
%
*
*Annualized.
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.60% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class 529-C  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class 529-C
Trading Symbol CWMCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529C
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-529C
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-C
$
72		1.35
%
*
*Annualized.
Expenses Paid, Amount $ 72
Expense Ratio, Percent 1.35% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class 529-E  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class 529-E
Trading Symbol CWMEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529E
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-529E
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-E
$
45		0.84
%
*
*Annualized.
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.84% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class 529-T  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class 529-T
Trading Symbol TMWMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-T
$
20		0.37
%
*
*Annualized.
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.37% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class 529-F-1  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class 529-F-1
Trading Symbol CWMFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529F1
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-529F1
Expenses [Text Block]
What were the fund costs for the
las
t six
months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-1
$
24		0.44
%
*
*Annualized.
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.44% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund sta
tisti
cs
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Port
fol
io hol
din
gs by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class 529-F-2  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class 529-F-2
Trading Symbol FWMMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529F2
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-529F2
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-2
$
19		0.35
%
*
*Annualized.
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.35% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class 529-F-3  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class 529-F-3
Trading Symbol FWWMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529F3
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-529F3
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-3
$
17		0.32
%
*
*Annualized.
Expenses Paid, Amount $ 17
Expense Ratio, Percent 0.32% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Port
folio
holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class R-1  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-1
Trading Symbol RWMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R1
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R1
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-1
$
71		1.34
%
*
*Annualized.
Expenses Paid, Amount $ 71
Expense Ratio, Percent 1.34% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio h
oldin
gs by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund - Class R-2  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-2
Trading Symbol RWMBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R2
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R2
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-2
$
72		1.35
%
*
*Annualized.
Expenses Paid, Amount $ 72
Expense Ratio, Percent 1.35% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Po
rtfoli
o holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund Class R-2E  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-2E
Trading Symbol RWEBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R2E
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R2E
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-2E
$
57		1.06
%
*
*Annualized.
Expenses Paid, Amount $ 57
Expense Ratio, Percent 1.06% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund Class R-3  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-3
Trading Symbol RWMCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R3
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R3
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-3
$
49		0.91
%
*
*Annualized.
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.91% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund Class R-4  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-4
Trading Symbol RWMEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R4
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R4
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-4
$
33		0.61
%
*
*Annualized.
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.61% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund Class R-5E  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-5E
Trading Symbol RWMHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R5E
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R5E
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-5E
$
22		0.41
%
*
*Annualized.
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.41% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund Class R-5  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-5
Trading Symbol RWMFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R5
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R5
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-5
$
17		0.31
%
*
*Annualized.
Expenses Paid, Amount $ 17
Expense Ratio, Percent 0.31% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund sta
tisti
cs
Fund net assets (in millions)
$
189,223
%
Total number of portfolio holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Washington Mutual Investors Fund Class R-6  
Shareholder Report [Line Items]  
Fund Name Washington Mutual Investors Fund
Class Name Class R-6
Trading Symbol RWMGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Washington Mutual Investors Fund (the "fund") for the period from May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R6
. You can also request this information by contacting us at (800) 421-4225.
Additional Information Phone Number (800) 421-4225
Additional Information Website capitalgroup.com/mutual-fund-literature-R6
Expenses [Text Block]
What were the fund costs for the
last six months
?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-6
$
14		0.26
%
*
*Annualized.
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.26% [1]
Net Assets $ 189,223,000,000
Holdings Count | Holding 197
Investment Company, Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in
millions)
$
189,223
%
Total number of
portfolio
holdings
$
197
%
Portfolio turnover rate
$
12
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
[1] Annualized.

v3.24.4
Shareholder Report, Holdings (Details)
Oct. 31, 2024
Washington Mutual Investors Fund - Class A | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class A | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class A | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class A | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class A | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class A | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class A | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class A | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class A | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class A | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class C | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class C | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class C | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class C | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class C | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class C | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class C | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class C | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class C | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class C | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class T | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class T | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class T | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class T | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class T | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class T | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class T | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class T | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class T | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class T | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class F-1 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class F-1 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class F-1 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class F-1 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class F-1 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class F-1 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class F-1 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class F-1 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class F-1 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class F-1 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class F-2 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class F-2 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class F-2 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class F-2 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class F-2 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class F-2 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class F-2 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class F-2 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class F-2 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class F-2 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class F-3 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class F-3 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class F-3 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class F-3 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class F-3 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class F-3 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class F-3 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class F-3 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class F-3 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class F-3 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund Class 529-A | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund Class 529-A | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund Class 529-A | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund Class 529-A | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund Class 529-A | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund Class 529-A | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund Class 529-A | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund Class 529-A | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund Class 529-A | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund Class 529-A | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class 529-C | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class 529-C | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class 529-C | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class 529-C | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class 529-C | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class 529-C | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class 529-C | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class 529-C | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class 529-C | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class 529-C | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class 529-E | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class 529-E | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class 529-E | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class 529-E | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class 529-E | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class 529-E | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class 529-E | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class 529-E | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class 529-E | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class 529-E | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class 529-T | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class 529-T | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class 529-T | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class 529-T | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class 529-T | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class 529-T | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class 529-T | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class 529-T | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class 529-T | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class 529-T | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class 529-F-1 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class 529-F-1 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class 529-F-1 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class 529-F-1 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class 529-F-1 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class 529-F-1 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class 529-F-1 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class 529-F-1 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class 529-F-1 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class 529-F-1 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class 529-F-2 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class 529-F-2 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class 529-F-2 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class 529-F-2 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class 529-F-2 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class 529-F-2 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class 529-F-2 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class 529-F-2 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class 529-F-2 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class 529-F-2 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class 529-F-3 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class 529-F-3 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class 529-F-3 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class 529-F-3 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class 529-F-3 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class 529-F-3 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class 529-F-3 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class 529-F-3 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class 529-F-3 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class 529-F-3 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class R-1 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class R-1 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class R-1 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class R-1 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class R-1 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class R-1 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class R-1 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class R-1 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class R-1 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class R-1 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund - Class R-2 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund - Class R-2 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund - Class R-2 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund - Class R-2 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund - Class R-2 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund - Class R-2 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund - Class R-2 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund - Class R-2 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund - Class R-2 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund - Class R-2 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund Class R-2E | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund Class R-2E | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund Class R-2E | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund Class R-2E | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund Class R-2E | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund Class R-2E | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund Class R-2E | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund Class R-2E | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund Class R-2E | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund Class R-2E | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund Class R-3 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund Class R-3 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund Class R-3 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund Class R-3 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund Class R-3 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund Class R-3 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund Class R-3 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund Class R-3 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund Class R-3 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund Class R-3 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund Class R-4 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund Class R-4 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund Class R-4 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund Class R-4 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund Class R-4 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund Class R-4 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund Class R-4 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund Class R-4 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund Class R-4 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund Class R-4 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund Class R-5E | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund Class R-5E | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund Class R-5E | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund Class R-5E | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund Class R-5E | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund Class R-5E | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund Class R-5E | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund Class R-5E | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund Class R-5E | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund Class R-5E | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund Class R-5 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund Class R-5 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund Class R-5 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund Class R-5 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund Class R-5 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund Class R-5 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund Class R-5 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund Class R-5 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund Class R-5 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund Class R-5 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Washington Mutual Investors Fund Class R-6 | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.97%
Washington Mutual Investors Fund Class R-6 | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.99%
Washington Mutual Investors Fund Class R-6 | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.55%
Washington Mutual Investors Fund Class R-6 | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.95%
Washington Mutual Investors Fund Class R-6 | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.14%
Washington Mutual Investors Fund Class R-6 | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.43%
Washington Mutual Investors Fund Class R-6 | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.02%
Washington Mutual Investors Fund Class R-6 | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.75%
Washington Mutual Investors Fund Class R-6 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Washington Mutual Investors Fund Class R-6 | Short Term Securities And Other Assets Less Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00% 

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