Mountaineer Partners Management, LLC
Registered adviserRegulatory profile
From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.
| Rosters | Regulatory AUM | Main clients |
|---|---|---|
| Apr 2026 to Oct 2026 | $305,735,762 | Diversified |
| Apr 2025 to Mar 2026 | $187,368,276 | Charitable organizations (51%) |
| Apr 2024 to Mar 2025 | $252,656,089 | Charitable organizations (58%) |
| May 2023 to Mar 2024 | $302,979,422 | Charitable organizations (58%) |
| Apr 2023 | $302,979,422 | Charitable organizations (58%) |
| Apr 2022 to Mar 2023 | $315,649,815 | Charitable organizations (54%) |
Portfolio style
Measured from the filed 13F common-share book for Jun 30, 2026, never from the firm's own description.
Closest benchmark: the S&P MidCap 400 as of 2026-06-30, active share 97.7%; sector active share 80.6% against the combined 13F book's sector weights.
Over time 26 measured quarters
How the bands are measured
Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.
Clone Performance
Build a hypothetical price-return history from this filer's public 13F holdings.
View clone backtestPortfolio 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.