Mountaineer Partners Management, LLC: 13F holdings, Q2 2026
Hedge fund · SEC EDGAR filings (CIK 1730532) · Explore on the interactive board
Mountaineer Partners Management, LLC disclosed 11 US equity positions worth $134.8m in its Q2 2026 13F filing (holdings as of June 30, 2026, filed August 14, 2026). Its largest position is CENX at 17.2% of the reported book, followed by SXT, CSTM. The top ten holdings are 97.0% of the book, and the portfolio behaves like about 9 equal-weight positions. Versus the prior filing it opened 1 new position, added to 1, reduced 9 and exited 6. Note: this manager's most recent filing is 3934 quarters behind the newest quarter on file, so these figures are history rather than current positioning.
What does Mountaineer Partners Management, LLC own? Top holdings as of June 30, 2026
Change is measured in shares against the previous filing (Q1 2026), so price moves do not read as decisions. This quarter: 1 new, 1 added, 9 reduced, 6 exited.
| # | Stock | Sector | Weight | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|---|
| 1 | CENX CENTURY ALUM CO | Basic Materials | 17.2% | $23.2m | 503,309 | -14% | reduced |
| 2 | SXT SENSIENT TECHNOLOGIES CORP | Basic Materials | 12.1% | $16.2m | 131,727 | -16% | reduced |
| 3 | CSTM CONSTELLIUM SE | Basic Materials | 11.4% | $15.4m | 482,130 | -27% | reduced |
| 4 | SARO STANDARDAERO INC | Industrials | 10.3% | $13.9m | 464,595 | 14% | added |
| 5 | CRS CARPENTER TECHNOLOGY CORP | Industrials | 9.6% | $12.9m | 20,894 | -42% | reduced |
| 6 | ATI ATI INC | Industrials | 8.8% | $11.9m | 60,419 | -34% | reduced |
| 7 | MIDD MIDDLEBY CORP | Industrials | 8.6% | $11.6m | 67,536 | – | new |
| 8 | AA ALCOA CORP | Basic Materials | 8.1% | $10.9m | 208,165 | -11% | reduced |
| 9 | HMY HARMONY GOLD MNG LTD | Basic Materials | 6.9% | $9.3m | 612,949 | -8% | reduced |
| 10 | AMBP ARDAGH METAL PACKAGING S A | Consumer Cyclical | 4.0% | $5.4m | 1,148,027 | -39% | reduced |
| 11 | CCJ CAMECO CORP | Energy | 3.0% | $4.1m | 39,903 | -6% | reduced |
What did Mountaineer Partners Management, LLC sell? Positions exited since the previous filing
| Stock | Prior weight | Prior value |
|---|---|---|
| HBM HUDBAY MINERALS INC | 24.1% | $14.8m |
| FCX FREEPORT MCMORAN INC | 23.1% | $14.2m |
| KEX KIRBY CORP | 19.3% | $11.8m |
| DHI D R HORTON INC | 14.9% | $9.1m |
| BLDR BUILDERS FIRSTSOURCE INC | 13.2% | $8.1m |
| ULCC FRONTIER GROUP HLDGS INC | 5.5% | $3.4m |
Sector mix
| Sector | Weight |
|---|---|
| Basic Materials | 55.6% |
| Industrials | 37.3% |
| Consumer Cyclical | 4.0% |
| Energy | 3.0% |
Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.
Filing history
How concentrated is Mountaineer Partners Management, LLC's portfolio?
Across every quarter Mountaineer Partners Management, LLC has filed, its median largest position is 17.1% of the book and its median top-ten weight is 87.8%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 6.0 completed holding spells, the median lasted 1.0 quarters; 11.0 positions are still open and their final length is unknown.