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:
06-30-2021
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:
950 3rd Avenue
28TH FLOOR
New York, NY 10022
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]
08-13-2021
                           [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:
28
Form 13F Information table Value Total:
137335
          (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
AIR TRANSPORT SERVICES GRP ICOM00922R1054,636199,564SHSOLE199,564 0 0
AIR TRANSPORT SERVICES GRP ICOM00922R1051,70673,436SHSOLE 0 0 73,436
ALLEGHENY TECHNOLOGIES INCCOM01741R1022,372113,777SHSOLE 0 0 113,777
ALLEGHENY TECHNOLOGIES INCCOM01741R1026,736323,062SHSOLE323,062 0 0
BWX TECHNOLOGIES INCCOM05605H1002,41441,533SHSOLE 0 0 41,533
BWX TECHNOLOGIES INCCOM05605H1007,998137,617SHSOLE137,617 0 0
CALERES INCCOM1295001048,902326,213SHSOLE326,213 0 0
CALERES INCCOM1295001042,21781,226SHSOLE 0 0 81,226
CLEARWAY ENERGY INCCL C18539C2045,697215,150SHSOLE215,150 0 0
CLEARWAY ENERGY INCCL C18539C2042,08878,850SHSOLE 0 0 78,850
CONSTELLIUM SECL A SHSF211071012,379125,549SHSOLE 0 0 125,549
CONSTELLIUM SECL A SHSF211071018,863467,681SHSOLE467,681 0 0
EAGLE MATLS INCCOM26969P1082,48217,466SHSOLE 0 0 17,466
EAGLE MATLS INCCOM26969P1088,81662,034SHSOLE62,034 0 0
FIRSTENERGY CORPCOM3379321077,182193,008SHSOLE193,008 0 0
FIRSTENERGY CORPCOM3379321072,39664,392SHSOLE 0 0 64,392
GORES HLDGS V INCCOM CL A3828641062,391236,699SHSOLE 0 0 236,699
GORES HLDGS V INCCOM CL A3828641067,974789,501SHSOLE789,501 0 0
MIDDLEBY CORPCOM5962781012,40613,886SHSOLE 0 0 13,886
MIDDLEBY CORPCOM5962781017,47043,114SHSOLE43,114 0 0
OLIN CORPCOM PAR $16806652052,50754,184SHSOLE 0 0 54,184
OLIN CORPCOM PAR $16806652058,318179,803SHSOLE179,803 0 0
PROG HOLDINGS INCCOM NPV74319R1014,933102,500SHSOLE102,500 0 0
PROG HOLDINGS INCCOM NPV74319R1011,81937,800SHSOLE 0 0 37,800
SPIRIT AEROSYSTEMS HLDGS INCCOM CL A8485741092,37850,390SHSOLE 0 0 50,390
SPIRIT AEROSYSTEMS HLDGS INCCOM CL A8485741099,486201,010SHSOLE201,010 0 0
VISHAY INTERTECHNOLOGY INCCOM9282981082,518111,644SHSOLE 0 0 111,644
VISHAY INTERTECHNOLOGY INCCOM9282981088,251365,888SHSOLE365,888 0 0