Mountaineer Partners Management, LLC
In its 13F for Q4 2024 (holdings as of December 31, 2024, filed February 14, 2025), Mountaineer Partners Management, LLC reported 17 stock positions worth $136.6 million. Its top holding was Century Aluminum (CENX) at 8.6% of the portfolio, followed by Everus Construction (ECG, 7.8%) and Ati (ATI, 7.4%). Compared with Q3 2024, it opened 2 new positions, added to 5 and reduced 6. The biggest buy was a new position in Everus Construction (ECG) and the biggest sale Vishay Intertechnology (VSH, shares −53%).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001730532
- Portfolio Value
- $136.6M (Q4 2024)
- SEC Filing
- 0000919574-25-001213 ↗ filed Feb 14, 2025
Holdings Value
Holdings 17 stocks · $136.6M
| CENX Century Aluminum Company | 8.64% | 647,845 | $11.8M | Reduce -54.0% |
| ECG Everus Construction Group | 7.83% | 162,722 | $10.7M | New |
| ATI Ati Inc. | 7.36% | 182,670 | $10.1M | Add +29.9% |
| ENTG Entegris Inc. | 7.24% | 99,860 | $9.9M | Add +1.7% |
| AA Alcoa Corp. | 7.13% | 257,778 | $9.7M | Reduce -7.9% |
| GEV GE Vernova Inc. | 7.08% | 29,373 | $9.7M | Reduce -23.8% |
| FCX Freeport-McMoran Inc. | 6.88% | 246,840 | $9.4M | Add +3.3% |
| CSTM Constellium SE | 6.67% | 887,239 | $9.1M | Add +61.6% |
| HBM Hudbay Minerals Inc. | 6.55% | 1,104,563 | $8.9M | Reduce -1.7% |
| VSH Vishay Intertechnology Inc. | 6.41% | 516,570 | $8.8M | Reduce -53.1% |
| BLDR Builders Firstsource Inc. | 5.85% | 55,875 | $8.0M | No change |
| MTRN Materion Corp. | 5.77% | 79,742 | $7.9M | Reduce -2.5% |
| DHI D.R. Horton Inc. | 5.22% | 51,015 | $7.1M | Add +0.2% |
| STNG Scorpio Tankers Inc. | 4.27% | 117,417 | $5.8M | No change |
| NXE Nexgen Energy Ltd. | 2.73% | 564,507 | $3.7M | No change |
| AMBP Ardagh Metal Packaging SA | 2.33% | 1,057,720 | $3.2M | New |
| SJT San Juan Basin Royalty TR | 2.02% | 719,054 | $2.8M | No change |
Portfolio Sells Q3 2024 → Q4 2024
Portfolio Buys Q3 2024 → Q4 2024
| ECG Everus Construction Group | New | 7.83% | +7.83 |
| AMBP Ardagh Metal Packaging SA | New | 2.33% | +2.33 |
| ATI Ati Inc. | Add +29.9% | 7.36% | +1.49 |
| CSTM Constellium SE | Add +61.6% | 6.67% | +1.10 |
| ENTG Entegris Inc. | Add +1.7% | 7.24% | +0.36 |
| FCX Freeport-McMoran Inc. | Add +3.3% | 6.88% | −0.56 |
| DHI D.R. Horton Inc. | Add +0.2% | 5.22% | −0.83 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026Amended | 11 | $137.5M | CENX, SXT, CSTM, SARO, CRS |
| Q1 2026 | 16 | $201.3M | CENX, CSTM, AA, HBM, FCX |
| Q4 2025 | 17 | $178.7M | CENX, HBM, ATI, FCX, AA |
| Q3 2025 | 18 | $171.9M | CENX, ECG, HBM, CSTM, ATI |
| Q2 2025 | 16 | $151.3M | ECG, CENX, HBM, VSH, CSTM |
| Q1 2025 | 14 | $104.5M | CENX, VSH, FCX, ATI, HBM |
| Q4 2024 | 17 | $136.6M | CENX, ECG, ATI, ENTG, AA |
| Q3 2024Amended | 15 | $160.4M | CENX, VSH, FCX, ENTG, BLDR |
| Q2 2024 | 16 | $192.2M | VSH, CENX, FCX, ATI, FANG |
| Q1 2024 | 16 | $216.6M | VSH, CENX, MTRN, FCX, FANG |