Mountaineer Partners Management, LLC
In its 13F for Q1 2025 (holdings as of March 31, 2025, filed May 15, 2025), Mountaineer Partners Management, LLC reported 14 stock positions worth $104.5 million. Its top holding was Century Aluminum (CENX) at 11.4% of the portfolio, followed by Vishay Intertechnology (VSH, 10.0%) and Freeport-McMoran (FCX, 9.1%). Compared with Q4 2024, it sold out of 3, added to 7 and reduced 4. The biggest buy was Vishay Intertechnology (VSH, shares +28%) and the biggest sale an exit from GE Vernova (GEV).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001730532
- Portfolio Value
- $104.5M (Q1 2025)
- SEC Filing
- 0000919574-25-003166 ↗ filed May 15, 2025
Holdings Value
Holdings 14 stocks · $104.5M
| CENX Century Aluminum Company | 11.36% | 639,373 | $11.9M | Reduce -1.3% |
| VSH Vishay Intertechnology Inc. | 10.03% | 659,478 | $10.5M | Add +27.7% |
| FCX Freeport-McMoran Inc. | 9.08% | 250,558 | $9.5M | Add +1.5% |
| ATI Ati Inc. | 9.03% | 181,375 | $9.4M | Reduce -0.7% |
| HBM Hudbay Minerals Inc. | 8.43% | 1,161,055 | $8.8M | Add +5.1% |
| ENTG Entegris Inc. | 8.25% | 98,529 | $8.6M | Reduce -1.3% |
| ECG Everus Construction Group | 8.05% | 226,857 | $8.4M | Add +39.4% |
| AA Alcoa Corp. | 7.76% | 265,965 | $8.1M | Add +3.2% |
| BLDR Builders Firstsource Inc. | 6.96% | 58,211 | $7.3M | Add +4.2% |
| DHI D.R. Horton Inc. | 6.53% | 53,655 | $6.8M | Add +5.2% |
| CSTM Constellium SE | 5.23% | 542,068 | $5.5M | Reduce -38.9% |
| SJT San Juan Basin Royalty TR | 3.81% | 719,054 | $4.0M | No change |
| AMBP Ardagh Metal Packaging SA | 3.06% | 1,057,720 | $3.2M | No change |
| NXE Nexgen Energy Ltd. | 2.43% | 564,507 | $2.5M | No change |
Portfolio Sells Q4 2024 → Q1 2025
| GEV GE Vernova Inc. | Sold out | 0.00% | −7.08 |
| MTRN Materion Corp. | Sold out | 0.00% | −5.77 |
| STNG Scorpio Tankers Inc. | Sold out | 0.00% | −4.27 |
| CSTM Constellium SE | Reduce -38.9% | 5.23% | −1.44 |
| ENTG Entegris Inc. | Reduce -1.3% | 8.25% | +1.00 |
| ATI Ati Inc. | Reduce -0.7% | 9.03% | +1.67 |
| CENX Century Aluminum Company | Reduce -1.3% | 11.36% | +2.71 |
Portfolio Buys Q4 2024 → Q1 2025
| VSH Vishay Intertechnology Inc. | Add +27.7% | 10.03% | +3.63 |
| FCX Freeport-McMoran Inc. | Add +1.5% | 9.08% | +2.19 |
| HBM Hudbay Minerals Inc. | Add +5.1% | 8.43% | +1.88 |
| DHI D.R. Horton Inc. | Add +5.2% | 6.53% | +1.30 |
| BLDR Builders Firstsource Inc. | Add +4.2% | 6.96% | +1.11 |
| AA Alcoa Corp. | Add +3.2% | 7.76% | +0.63 |
| ECG Everus Construction Group | Add +39.4% | 8.05% | +0.22 |
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 |