Mountaineer Partners Management, LLC
In its 13F for Q2 2025 (holdings as of June 30, 2025, filed August 14, 2025), Mountaineer Partners Management, LLC reported 16 stock positions worth $151.3 million. Its top holding was Everus Construction (ECG) at 8.7% of the portfolio, followed by Century Aluminum (CENX, 8.4%) and Hudbay Minerals (HBM, 7.9%). Compared with Q1 2025, it opened 3 new positions, sold out of 1, added to 8 and reduced 3. The biggest buy was a new position in Carpenter Technology (CRS) and the biggest sale an exit from D.R. Horton (DHI).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001730532
- Portfolio Value
- $151.3M (Q2 2025)
- SEC Filing
- 0000919574-25-004802 ↗ filed Aug 14, 2025
Holdings Value
Holdings 16 stocks · $151.3M
| ECG Everus Construction Group | 8.66% | 206,218 | $13.1M | Reduce -9.1% |
| CENX Century Aluminum Company | 8.40% | 705,150 | $12.7M | Add +10.3% |
| HBM Hudbay Minerals Inc. | 7.89% | 1,124,432 | $11.9M | Reduce -3.1% |
| VSH Vishay Intertechnology Inc. | 7.79% | 742,505 | $11.8M | Add +12.6% |
| CSTM Constellium SE | 7.43% | 845,682 | $11.2M | Add +56.0% |
| CRS Carpenter Technology | 7.30% | 39,982 | $11.1M | New |
| FCX Freeport-McMoran Inc. | 7.25% | 252,961 | $11.0M | Add +1.0% |
| ATI Ati Inc. | 7.02% | 122,970 | $10.6M | Reduce -32.2% |
| ENTG Entegris Inc. | 6.73% | 126,230 | $10.2M | Add +28.1% |
| SARO Standardaero Inc. | 6.08% | 290,730 | $9.2M | New |
| AA Alcoa Corp. | 5.94% | 304,781 | $9.0M | Add +14.6% |
| KEX Kirby Corp. | 4.90% | 65,431 | $7.4M | New |
| BLDR Builders Firstsource Inc. | 4.82% | 62,464 | $7.3M | Add +7.3% |
| AMBP Ardagh Metal Packaging SA | 4.35% | 1,538,484 | $6.6M | Add +45.5% |
| SJT San Juan Basin Royalty TR | 2.84% | 719,054 | $4.3M | No change |
| NXE Nexgen Energy Ltd. | 2.59% | 564,507 | $3.9M | No change |
Portfolio Sells Q1 2025 → Q2 2025
Portfolio Buys Q1 2025 → Q2 2025
| CRS Carpenter Technology | New | 7.30% | +7.30 |
| SARO Standardaero Inc. | New | 6.08% | +6.08 |
| KEX Kirby Corp. | New | 4.90% | +4.90 |
| CSTM Constellium SE | Add +56.0% | 7.43% | +2.20 |
| AMBP Ardagh Metal Packaging SA | Add +45.5% | 4.35% | +1.30 |
| ENTG Entegris Inc. | Add +28.1% | 6.73% | −1.52 |
| AA Alcoa Corp. | Add +14.6% | 5.94% | −1.82 |
| FCX Freeport-McMoran Inc. | Add +1.0% | 7.25% | −1.83 |
| BLDR Builders Firstsource Inc. | Add +7.3% | 4.82% | −2.14 |
| VSH Vishay Intertechnology Inc. | Add +12.6% | 7.79% | −2.24 |
| CENX Century Aluminum Company | Add +10.3% | 8.40% | −2.96 |
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 |