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

FORM 13F COVER PAGE
OMB APPROVAL
OMB Number:3235-0006
Expires:July 31, 2015
Estimated average burden
hours per response:23.8
Report for the Calendar Year or Quarter Ended:
12-31-2020
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:
Mountaineer Partners Management, LLC
Address:
150 EAST 58TH ST
14TH FLOOR
New York, NY 10155
Form 13F File Number:
028-19269

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:
Mark Lee
Title:
Managing Member
Phone:
646-459-7061


Signature, Place, and Date of Signing:

/s/ Mark Lee
                         [Signature]
New York, NEW YORK
                 [City, State]
02-12-2021
                           [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).)


Form 13F Summary Page

Report Summary:

Number of Other Included Managers:
0
Form 13F Information table Entry Total:
34
Form 13F Information table Value Total:
139355
          (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.
[If there are no entries in this list, state "NONE" and omit the column headings and list entries.]

  
NONE


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

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number:3235-0006
Expires:July 31, 2015
Estimated average burden
hours per response:23.8
COLUMN 1COLUMN 2COLUMN 3COLUMN 4COLUMN 5COLUMN 6COLUMN 7COLUMN 8
VALUESHRS ORSH/PUT/INVESTMENTOTHERVOTING AUTHORITY
NAME OF ISSUERTITLE OF CLASSCUSIP(x$1000)PRN AMTPRNCALLDISCRETIONMANAGERSOLESHAREDNONE
ALLEGHENY TECHNOLOGIES INCCOM01741R1025,103304,307SHSOLE304,307 0 0
ALLEGHENY TECHNOLOGIES INCCOM01741R1022,110125,835SHSOLE 0 0 125,835
BAUSCH HEALTH COS INCCOM0717341077,797374,862SHSOLE374,862 0 0
BAUSCH HEALTH COS INCCOM0717341072,347112,838SHSOLE 0 0 112,838
BUILDERS FIRSTSOURCE INCCOM12008R1077,876192,985SHSOLE192,985 0 0
BUILDERS FIRSTSOURCE INCCOM12008R1072,34057,342SHSOLE 0 0 57,342
BWX TECHNOLOGIES INCCOM05605H1001,69628,134SHSOLE28,134 0 0
BWX TECHNOLOGIES INCCOM05605H10060710,066SHSOLE 0 0 10,066
CLEARWAY ENERGY INCCL C18539C2043,257102,007SHSOLE102,007 0 0
CLEARWAY ENERGY INCCL C18539C2041,19837,504SHSOLE 0 0 37,504
CONSTELLIUM SECL A SHSF211071019,914708,681SHSOLE708,681 0 0
CONSTELLIUM SECL A SHSF211071012,329166,471SHSOLE 0 0 166,471
D R HORTON INCCOM23331A1095,24276,064SHSOLE76,064 0 0
D R HORTON INCCOM23331A1091,97428,636SHSOLE 0 0 28,636
FIRSTENERGY CORPCOM3379321075,413176,830SHSOLE176,830 0 0
FIRSTENERGY CORPCOM3379321071,99565,170SHSOLE 0 0 65,170
MGM GROWTH PPTYS LLCCL A COM55303A1056,315201,761SHSOLE201,761 0 0
MGM GROWTH PPTYS LLCCL A COM55303A1052,19870,239SHSOLE 0 0 70,239
MIDDLEBY CORPCOM5962781016,19048,014SHSOLE48,014 0 0
MIDDLEBY CORPCOM5962781012,19016,986SHSOLE 0 0 16,986
PG&E CORPCOM69331C1087,353590,134SHSOLE590,134 0 0
PG&E CORPCOM69331C1082,362189,566SHSOLE 0 0 189,566
PROG HOLDINGS INCCOM NPV74319R1015,522102,500SHSOLE102,500 0 0
PROG HOLDINGS INCCOM NPV74319R1012,03637,800SHSOLE 0 0 37,800
SABRA HEALTH CARE REIT INCCOM78573L1066,021346,654SHSOLE346,654 0 0
SABRA HEALTH CARE REIT INCCOM78573L1062,221127,846SHSOLE 0 0 127,846
SL GREEN RLTY CORPCOM78440X1012,26237,969SHSOLE 0 0 37,969
SL GREEN RLTY CORPCOM78440X1016,997117,431SHSOLE117,431 0 0
VISHAY INTERTECHNOLOGY INCCOM9282981087,789376,088SHSOLE376,088 0 0
VISHAY INTERTECHNOLOGY INCCOM9282981082,381114,970SHSOLE 0 0 114,970
VORNADO RLTY TRSH BEN INT9290421092,22959,687SHSOLE 0 0 59,687
VORNADO RLTY TRSH BEN INT9290421096,378170,813SHSOLE170,813 0 0
VULCAN MATLS COCOM9291601095,62437,918SHSOLE37,918 0 0
VULCAN MATLS COCOM9291601092,08914,082SHSOLE 0 0 14,082