Mountaineer Partners Management, LLC
In its 13F for Q3 2024 (holdings as of September 30, 2024, filed November 15, 2024), Mountaineer Partners Management, LLC reported 15 stock positions worth $160.4 million. Its top holding was Century Aluminum (CENX) at 14.2% of the portfolio, followed by Vishay Intertechnology (VSH, 13.0%) and Freeport-McMoran (FCX, 7.4%). Compared with Q2 2024, it opened 3 new positions, sold out of 4, added to 4 and reduced 8. The biggest buy was a new position in Builders Firstsource (BLDR) and the biggest sale Vishay Intertechnology (VSH, shares −46%).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001730532
- Portfolio Value
- $160.4M (Q3 2024)
- SEC Filing
- 0000919574-24-006813 ↗ filed Nov 15, 2024
Holdings Value
Holdings 15 stocks · $160.4M
| CENX Century Aluminum Company | 14.25% | 1,407,831 | $22.8M | Add +5.2% |
| VSH Vishay Intertechnology Inc. | 13.00% | 1,102,278 | $20.8M | Reduce -45.8% |
| FCX Freeport-McMoran Inc. | 7.44% | 239,045 | $11.9M | Reduce -2.5% |
| ENTG Entegris Inc. | 6.89% | 98,148 | $11.0M | Add +45.3% |
| BLDR Builders Firstsource Inc. | 6.75% | 55,875 | $10.8M | New |
| AA Alcoa Corp. | 6.73% | 279,831 | $10.8M | Add +6.9% |
| HBM Hudbay Minerals Inc. | 6.44% | 1,123,352 | $10.3M | Reduce -2.9% |
| GEV GE Vernova Inc. | 6.13% | 38,565 | $9.8M | New |
| DHI D.R. Horton Inc. | 6.06% | 50,921 | $9.7M | New |
| ATI Ati Inc. | 5.87% | 140,650 | $9.4M | Reduce -32.7% |
| MTRN Materion Corp. | 5.70% | 81,776 | $9.1M | Reduce -14.5% |
| CSTM Constellium SE | 5.57% | 549,134 | $8.9M | Add +9.7% |
| STNG Scorpio Tankers Inc. | 5.22% | 117,417 | $8.4M | Reduce -1.4% |
| NXE Nexgen Energy Ltd. | 2.30% | 564,507 | $3.7M | Reduce -2.5% |
| SJT San Juan Basin Royalty TR | 1.66% | 719,054 | $2.7M | Reduce -2.6% |
Portfolio Sells Q2 2024 → Q3 2024
| VSH Vishay Intertechnology Inc. | Reduce -45.8% | 13.00% | −10.60 |
| FANG Diamondback Energy Inc. | Sold out | 0.00% | −5.89 |
| WFG West Fraser Timber Co. Ltd. | Sold out | 0.00% | −4.90 |
| OLN Olin Corp. | Sold out | 0.00% | −4.59 |
| RIG Transocean Ltd. | Sold out | 0.00% | −2.51 |
| ATI Ati Inc. | Reduce -32.7% | 5.87% | −0.16 |
| SJT San Juan Basin Royalty TR | Reduce -2.6% | 1.66% | +0.10 |
| STNG Scorpio Tankers Inc. | Reduce -1.4% | 5.22% | +0.18 |
| NXE Nexgen Energy Ltd. | Reduce -2.5% | 2.30% | +0.20 |
| MTRN Materion Corp. | Reduce -14.5% | 5.70% | +0.32 |
| HBM Hudbay Minerals Inc. | Reduce -2.9% | 6.44% | +0.99 |
| FCX Freeport-McMoran Inc. | Reduce -2.5% | 7.44% | +1.24 |
Portfolio Buys Q2 2024 → Q3 2024
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 |