Mountaineer Partners Management, LLC 13F holdings, Q4 2025
Holdings as of December 31, 2025 · filings on SEC EDGAR · latest filing →
Mountaineer Partners Management, LLC disclosed 17 US equity positions worth $178.7m in its Q4 2025 13F filing. The largest position was CENX at 13.3% of the reported book, followed by HBM and ATI. Against the Q3 2025 filing, it opened 3 new positions, added to 5 and reduced 9 among the top 17 holdings.
What did Mountaineer Partners Management, LLC own in Q4 2025? Top 17 positions
| # | Stock | Sector | Weight | Value | Shares | Δ shares | vs Q3 2025 |
|---|---|---|---|---|---|---|---|
| 1 | CENX CENTURY ALUM CO | Basic Materials | 13.3% | $23.8m | 608,475 | -8% | reduced |
| 2 | HBM HUDBAY MINERALS INC | Basic Materials | 8.7% | $15.6m | 787,247 | -18% | reduced |
| 3 | ATI ATI INC | Industrials | 8.3% | $14.8m | 128,909 | -10% | reduced |
| 4 | FCX FREEPORT-MCMORAN INC | Basic Materials | 7.6% | $13.5m | 266,327 | -9% | reduced |
| 5 | AA ALCOA CORP | Basic Materials | 7.2% | $12.9m | 241,994 | -18% | reduced |
| 6 | CSTM CONSTELLIUM SE | Basic Materials | 7.2% | $12.8m | 681,464 | -18% | reduced |
| 7 | CRS CARPENTER TECHNOLOGY CORP | Industrials | 6.5% | $11.6m | 36,690 | -10% | reduced |
| 8 | SXT SENSIENT TECHNOLOGIES CORP | Basic Materials | 6.2% | $11.0m | 117,090 | – | new |
| 9 | SARO STANDARDAERO INC | Industrials | 5.9% | $10.5m | 367,498 | 26% | added |
| 10 | BLDR BUILDERS FIRSTSOURCE INC | Industrials | 5.4% | $9.7m | 94,091 | 55% | added |
| 11 | KEX KIRBY CORP | Industrials | 5.4% | $9.6m | 87,444 | 34% | added |
| 12 | DHI D R HORTON INC | Consumer Cyclical | 5.2% | $9.4m | 65,004 | 133% | added |
| 13 | AMBP ARDAGH METAL PACKAGING S A | Consumer Cyclical | 3.4% | $6.0m | 1,469,480 | -4% | reduced |
| 14 | NXE NEXGEN ENERGY LTD | Energy | 2.8% | $4.9m | 538,042 | -5% | reduced |
| 15 | ULCC FRONTIER GROUP HLDGS INC | Industrials | 2.5% | $4.5m | 953,375 | – | new |
| 16 | SAN JUAN BASIN RTY TR | 2.3% | $4.1m | 732,351 | 2% | added | |
| 17 | CCJ CAMECO CORP | Energy | 2.2% | $3.9m | 42,424 | – | new |
Weights are shares of the reported long US equity book (options excluded). Values are as filed, normalised to whole dollars. Share changes compare against the immediately preceding filing only.