UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE
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OMB Number:3235-0006
Expires:July 31, 2015
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hours per response:23.8
Report for the Calendar Year or Quarter Ended:
06-30-2023
Check here if Amendment: ☐ Amendment Number:
This Amendment (Check only one.):☐ is a restatement.
☐ adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:
Arthur J. Gallagher & Co.
Address:
2850 GOLF ROAD
ROLLING MEADOWS, IL 60008-4050
Form 13F File Number:
028-14530

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.


Person Signing this Report on Behalf of Reporting Manager:
Name:
Seth Diehl
Title:
Assistant Secretary
Phone:
630-773-3800


Signature, Place, and Date of Signing:

/s/Seth Diehl
                         [Signature]
Rolling Meadows, ILLINOIS
                 [City, State]
08-14-2023
                           [Date]
                          

Report Type (Check only one.):

☐ 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) 

☒ 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).) 

☐ 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)



List of Other Managers Reporting for this Manager
[If there are no entries in this list, omit this section.]



Form 13F File NumberNameCIK
028-14533
Gallagher Fiduciary Advisors, LLC
0001527781