Mountaineer Partners Management, LLC
Clone Performance
Aug 2023–Aug 2026 · vs SPYHypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.
Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. Returns use comparable raw closes and exclude dividends; a captured split can shorten the simulated window. It tracks 100% of reported value on average across 13 quarters. Past performance does not predict future results.
Portfolio Concentration
11 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026Portfolio Trend
Sector Breakdown
As of Jun 30, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Basic Materials | 55.6% | $74,940,025 |
| Industrials | 37.3% | $50,309,736 |
| Consumer Cyclical | 4.0% | $5,441,647 |
| Energy | 3.0% | $4,064,518 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| SARO | StandardAero, Inc. | +57,160 | 464,595 | $13,896,036 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reduced| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| AMBP | Ardagh Metal Packaging S.A. | −730,055 | 1,148,027 | $5,441,647 | |
| CSTM | Constellium SE | −176,360 | 482,130 | $15,365,482 | |
| CENX | Century Aluminum Co | −80,688 | 503,309 | $23,157,247 | |
| HMY | Harmony Gold Mining Co Ltd | −53,786 | 612,949 | $9,322,953 | |
| ATI | Ati Inc | −31,365 | 60,419 | $11,908,584 | |
| AA | Alcoa Corp | −25,522 | 208,165 | $10,853,722 | |
| SXT | Sensient Technologies Corp | −24,857 | 131,727 | $16,240,621 | |
| CRS | Carpenter Technology Corp | −15,035 | 20,894 | $12,888,254 | |
| CCJ | Cameco Corp | −2,521 | 39,903 | $4,064,518 | |
| No positions match the current search. | |||||
New Positions
Positions the filer opened this quarter| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| MIDD | MIDDLEBY Corp | 67,536 | $11,616,862 | |
| No positions match the current search. | ||||
Sold Out
Positions the filer fully exited| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| HBM | Hudbay Minerals Inc. | 706,040 | $14,756,235 | |
| FCX | Freeport-Mcmoran Inc | 240,973 | $14,164,392 | |
| KEX | Kirby Corp | 89,017 | $11,828,578 | |
| DHI | Horton D R Inc /De/ | 66,541 | $9,130,755 | |
| BLDR | Builders FirstSource, Inc. | 98,203 | $8,085,052 | |
| ULCC | Frontier Group Holdings, Inc. | 953,375 | $3,365,412 | |
| No positions match the current search. | ||||
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| CENX |
Century Aluminum Co
Basic Materials
|
Reduced | 503,309 | $23,157,247 | 17.18% | |
| SXT |
Sensient Technologies Corp
Basic Materials
|
Reduced | 131,727 | $16,240,621 | 12.05% | |
| CSTM |
Constellium SE
Basic Materials
|
Reduced | 482,130 | $15,365,482 | 11.40% | |
| SARO |
StandardAero, Inc.
Industrials
|
Added | 464,595 | $13,896,036 | 10.31% | |
| CRS |
Carpenter Technology Corp
Industrials
|
Reduced | 20,894 | $12,888,254 | 9.56% | |
| ATI |
Ati Inc
Industrials
|
Reduced | 60,419 | $11,908,584 | 8.84% | |
| MIDD |
MIDDLEBY Corp
Industrials
|
NEW | 67,536 | $11,616,862 | 8.62% | |
| AA |
Alcoa Corp
Basic Materials
|
Reduced | 208,165 | $10,853,722 | 8.05% | |
| HMY |
Harmony Gold Mining Co Ltd
Basic Materials
|
Reduced | 612,949 | $9,322,953 | 6.92% | |
| AMBP |
Ardagh Metal Packaging S.A.
Consumer Cyclical
|
Reduced | 1,148,027 | $5,441,647 | 4.04% | |
| CCJ |
Cameco Corp
Energy
|
Reduced | 39,903 | $4,064,518 | 3.02% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.