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:
03-31-2023
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:
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]
05-12-2023
                           [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).)


Form 13F Summary Page

Report Summary:

Number of Other Included Managers:
0
Form 13F Information table Entry Total:
26
Form 13F Information table Value Total:
137624533
          (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
ALCOA CORPCOM0138721062,136,00150,188SHSOLE 0 0 50,188
ALCOA CORPCOM0138721065,866,045137,830SHSOLE137,830 0 0
CENTURY ALUM COCOM1564311082,501,740250,174SHSOLE 0 0 250,174
CENTURY ALUM COCOM1564311088,530,270853,027SHSOLE853,027 0 0
CONSTELLIUM SECL A SHSF211071015,571,012364,595SHSOLE364,595 0 0
CONSTELLIUM SECL A SHSF211071012,028,573132,760SHSOLE 0 0 132,760
DIAMONDBACK ENERGY INCCOM25278X1095,021,16037,147SHSOLE37,147 0 0
DIAMONDBACK ENERGY INCCOM25278X1091,818,30713,452SHSOLE 0 0 13,452
ENTEGRIS INCCOM29362U1041,800,85821,959SHSOLE 0 0 21,959
ENTEGRIS INCCOM29362U1044,972,84060,637SHSOLE60,637 0 0
FREEPORT-MCMORAN INCCL B35671D8572,467,89660,325SHSOLE 0 0 60,325
FREEPORT-MCMORAN INCCL B35671D8577,657,043187,168SHSOLE187,168 0 0
HUDBAY MINERALS INCCOM4436281022,702,396514,742SHSOLE514,742 0 0
HUDBAY MINERALS INCCOM443628102972,605185,258SHSOLE 0 0 185,258
NEXGEN ENERGY LTDCOM65340P106503,377131,430SHSOLE 0 0 131,430
NEXGEN ENERGY LTDCOM65340P1061,384,549361,501SHSOLE361,501 0 0
OLIN CORPCOM PAR $16806652051,829,39132,962SHSOLE 0 0 32,962
OLIN CORPCOM PAR $16806652055,051,72191,022SHSOLE91,022 0 0
RPC INCCOM7496601061,497,412194,722SHSOLE 0 0 194,722
RPC INCCOM7496601064,141,988538,620SHSOLE538,620 0 0
SABRA HEALTH CARE REIT INCCOM78573L1067,471,723649,715SHSOLE649,715 0 0
SABRA HEALTH CARE REIT INCCOM78573L1062,528,770219,893SHSOLE 0 0 219,893
SPIRIT AEROSYSTEMS HLDGS INCCOM CL A8485741092,499,24772,379SHSOLE 0 0 72,379
SPIRIT AEROSYSTEMS HLDGS INCCOM CL A8485741097,771,253225,058SHSOLE225,058 0 0
VISHAY INTERTECHNOLOGY INCCOM9282981082,552,509112,843SHSOLE 0 0 112,843
VISHAY INTERTECHNOLOGY INCCOM92829810846,345,8472,048,888SHSOLE2,048,888 0 0