Stocks/Funds/CIK 1730532

Mountaineer Partners Management, LLC

long-term holderconcentrated
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1730532
Assets
$201M
+92.7% YoY
Holdings
16
Lifetime alpha vs market
+2.60% annual
Average hold time
2.6 yr
median 2.3 yr

Quarterly history

Cum return +69% vs S&P +52% · α +16% lifetimeAUM $201M · peak $205MFlow $-2M (-1%)2018-122020-032021-062022-092023-122025-032026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
+8.07%
adds when stocks drop
when a holding falls −10%+
Middle response
-0.71%
baseline attrition
Rally response
-7.79%
trims into rallies
when a holding rises +10%+

Top positions · 16

Ticker$ value% portYoYHold time
CENXCentury Aluminum Company$34M17.0%+216.2%4.0 yr
CSTMConstellium SE$16M8.0%+143.6%5.8 yr
AAAlcoa Corporation$16M7.7%+119.9%3.5 yr
HBMHudbay Minerals Inc.$15M7.3%+175.7%3.3 yr
FCXFreeport-McMoRan Inc.$14M7.0%+57.4%3.5 yr
CRSCarpenter Technology Cor$14M7.0%+118.3%1.0 yr
SXTSensient Technologies Co$14M6.7%+18.1%0.5 yr
ATIATI Inc.$13M6.6%+179.6%7.3 yr
KEXKirby Corporation$12M5.9%+31.6%2.0 yr
SAROStandardAero, Inc.$11M5.2%-3.0%1.0 yr
HMYHarmony Gold Mining Comp$10M5.1%+5.3%0.3 yr
DHID.R. Horton, Inc.$9M4.5%+9.2%2.5 yr
BLDRBuilders FirstSource, In$8M4.0%-34.1%4.0 yr
AMBPArdagh Metal Packaging S$8M3.8%+49.4%2.0 yr
CCJCameco Corporation$5M2.3%+164.4%0.5 yr

Portfolio composition (YoY)

Industry mix
Aluminum32.8%+8.4pp$66M
Copper14.4%-3.1pp$29M
Manufacturing - Metal Fabrication13.7%+4.6pp$28M
Chemicals - Specialty6.7%$14M
Marine Shipping5.9%$12M
Aerospace & Defense5.2%$11M
Gold5.1%$10M
Residential Construction4.5%-2.0pp$9M
Construction4.0%-2.9pp$8M
Packaging & Containers3.8%+0.7pp$8M
Country
US73.5%-7.4pp
CA9.6%-1.2pp
FR8.0%+2.8pp
ZA5.1%
LU3.8%+0.7pp
Top 5: 47.1% · Top 10: 78.6% · Top 25: 100.0%

Winners

TickerPrev $PnLYoY %
CENX$12M+0.03B216.2%
ATI$9M+0.02B179.6%
HBM$9M+0.02B175.7%
AA$8M+0.01B119.9%
CSTM$5M+0.01B143.6%

Losers

TickerPrev $PnLYoY %
BLDR$7M-0.00B-34.1%

Top buys this quarter · 7

HMY Harmony Gold Mining Company Linew+$10M
SXT Sensient Technologies Corporat+$3M
AMBP Ardagh Metal Packaging S.A.+$2M
SARO StandardAero, Inc.+$11M
BLDR Builders FirstSource, Inc.+$8M
DHI D.R. Horton, Inc.+$9M
KEX Kirby Corporation+$0M

Top sells this quarter · 9

NXE NexGen Energy Ltd.exit$6M
ATI ATI Inc.$5M
HBM Hudbay Minerals Inc.$2M
FCX Freeport-McMoRan Inc.$14M
CENX Century Aluminum Company$24M
CSTM Constellium SE$13M
AA Alcoa Corporation$13M
CRS Carpenter Technology Corporati$12M
SJT San Juan Basin Royalty Trustexit$0M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$201M16+92.74%+17.59%+75.14%-0.00B
2025-12-31$179M17+51.67%+17.72%+33.96%-0.02B
2025-09-30$172M18+15.84%+17.52%-1.68%+0.00B
2025-06-30$151M16-1.06%+14.94%-16.00%+0.02B
2025-03-31$105M14-21.22%+8.30%-29.52%-0.02B
2024-12-31$137M17-4.29%+24.89%-29.17%-0.01B
2024-09-30$160M15+18.49%+36.04%-17.55%-0.02B
2024-06-30$183M15+14.30%+24.49%-10.19%-0.02B
2024-03-31$205M15+31.70%+29.62%+2.08%+0.00B
2023-12-31$185M13+17.57%+26.18%-8.60%+0.02B
2023-09-30$147M13+13.70%+21.57%-7.87%-0.01B
2023-06-30$173M13+19.47%+19.42%+0.05%+0.02B
2023-03-31$131M12-15.68%-7.82%-7.87%+0.03B
2022-12-31$105M9+7.77%+7.56%+0.21%+0.02B
2022-09-30$79M9-2.36%-4.93%+2.57%-0.02B
2022-06-30$97M9-17.68%-16.11%-1.57%-0.04B