Mountaineer Partners Management, LLC

CIK

1730532

Location

New York, NY

Portfolio Value

Small $201,324,443

Diversification

Diversified

Filing Date

Global Rank

#4,176 / 8,605 ▲ 411 · as of Mar 2026

Top Industry

Aluminum 32.8%

3Y Alpha vs SPY

+3.6%

Period ended 3 months ago

Filed May 15, 2026 · 55d

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

+90.8%

SPY

+76.5%

Annualised alpha

+3.2%

Max drawdown

−40.6%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

16 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025

Top Position

17.0%

+3.7 pts

Top 5

47.1%

+2.0 pts

Top 10

78.6%

+2.4 pts

HHI

802

Diversified+83

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Basic Materials	58.9%	$118,664,386	7
Industrials	30.5%	$61,315,401	6
Consumer Cyclical	8.3%	$16,736,986	2
Energy	2.3%	$4,607,670	1

Last Quarter's Activity

Export CSV

Mar 31, 2026 vs Dec 31, 2025

Added To

Positions the filer increased

6 positions

Ticker	Company	Δ Shares	Shares	Value
AMBP	Ardagh Metal Packaging S.A.	+408,602	1,878,082	$7,606,231
SARO	StandardAero, Inc.	+39,937	407,435	$10,524,045
SXT	Sensient Technologies Corp	+39,494	156,584	$13,535,120
BLDR	Builders FirstSource, Inc.	+4,112	98,203	$8,085,052
KEX	Kirby Corp	+1,573	89,017	$11,828,578
DHI	Horton D R Inc /De/	+1,537	66,541	$9,130,755
No positions match the current search.

Trimmed

Positions the filer reduced

7 positions

Ticker	Company	Δ Shares	Shares	Value
HBM	Hudbay Minerals Inc.	−81,207	706,040	$14,756,235
ATI	Ati Inc	−37,125	91,784	$13,350,900
FCX	Freeport-Mcmoran Inc	−25,354	240,973	$14,164,392
CENX	Century Aluminum Co	−24,478	583,997	$34,274,783
CSTM	Constellium SE	−22,974	658,490	$16,185,683
AA	Alcoa Corp	−8,307	233,687	$15,500,457
CRS	Carpenter Technology Corp	−761	35,929	$14,161,414
No positions match the current search.

New Positions

Positions the filer opened this quarter

1 positions

Ticker	Company	Shares	Value	Open
HMY	Harmony Gold Mining Co Ltd	666,735	$10,247,716
No positions match the current search.

Sold Out

Positions the filer fully exited

2 positions

Ticker	Company	Shares	Value
NXE	NexGen Energy Ltd.	538,042	$4,949,986
SJT	San Juan Basin Royalty Trust	732,351	$4,115,811
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

16 positions · $201,324,443 total · as of Mar 31, 2026

All sectors Basic Materials Consumer Cyclical Energy Industrials

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
CENX	Century Aluminum Co Basic Materials	Reduced	583,997	-24,478	$34,274,783	+43.8%	17.02%
CSTM	Constellium SE Basic Materials	Reduced	658,490	-22,974	$16,185,683	+26.0%	8.04%
AA	Alcoa Corp Basic Materials	Reduced	233,687	-8,307	$15,500,457	+20.5%	7.70%
HBM	Hudbay Minerals Inc. Basic Materials	Reduced	706,040	-81,207	$14,756,235	−5.6%	7.33%
FCX	Freeport-Mcmoran Inc Basic Materials	Reduced	240,973	-25,354	$14,164,392	+4.7%	7.04%
CRS	Carpenter Technology Corp Industrials	Reduced	35,929	-761	$14,161,414	+22.6%	7.03%
SXT	Sensient Technologies Corp Basic Materials	Added	156,584	+39,494	$13,535,120	+23.0%	6.72%
ATI	Ati Inc Industrials	Reduced	91,784	-37,125	$13,350,900	−9.8%	6.63%
KEX	Kirby Corp Industrials	Added	89,017	+1,573	$11,828,578	+22.8%	5.88%
SARO	StandardAero, Inc. Industrials	Added	407,435	+39,937	$10,524,045	−0.1%	5.23%
HMY	Harmony Gold Mining Co Ltd Basic Materials	NEW	666,735	NEW	$10,247,716	NEW	5.09%
DHI	Horton D R Inc /De/ Consumer Cyclical	Added	66,541	+1,537	$9,130,755	−2.5%	4.54%
BLDR	Builders FirstSource, Inc. Industrials	Added	98,203	+4,112	$8,085,052	−16.5%	4.02%
AMBP	Ardagh Metal Packaging S.A. Consumer Cyclical	Added	1,878,082	+408,602	$7,606,231	+26.2%	3.78%
CCJ	Cameco Corp Energy	Held	42,424	0	$4,607,670	+18.7%	2.29%
ULCC	Frontier Group Holdings, Inc. Industrials	Held	953,375	0	$3,365,412	−25.1%	1.67%