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Super Investors Mountaineer Partners Management, LLC
MP

Mountaineer Partners Management, LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$137M
Positions
11
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (31 quarters reported)

$217M $70.3M
Q4 18 Q3 20 Q2 22 Q1 24 Q4 25 Q2 26

$118M in Q4 2018 → $137M now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
CA Century Alum Co 16.8% Trimmed 14% 503,309 $23.2M
Sensient Technologies Corp 11.8% Trimmed 16% 131,727 $16.2M
Constellium Se 11.2% Trimmed 27% 482,130 $15.4M
Standardaero Inc 10.1% Added 14% 464,595 $13.9M
Carpenter Technology Corp 9.4% Trimmed 42% 20,894 $12.9M
Ati Inc 8.7% Trimmed 34% 60,419 $11.9M
Middleby Corp 8.5% New 67,536 $11.6M
Alcoa Corp 7.9% Trimmed 11% 208,165 $10.9M
HG Harmony Gold Mng Ltd 6.8% Trimmed 8.1% 612,949 $9.32M
AM Ardagh Metal Packaging S A 5.9% Trimmed 8.3% 1,722,234 $8.16M
Cameco Corp 3.0% Trimmed 5.9% 39,903 $4.06M

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

Company Action Shares changed Value of change % of portfolio
Hudbay Minerals Inc Exited −706,040 −$14.8M —
Freeport Mcmoran Inc Exited −240,973 −$14.2M —
Kirby Corp Exited −89,017 −$11.8M —
Middleby Corp New +67,536 +$11.6M 8.5%
Carpenter Technology Corp Trimmed −15,035 −$9.27M 9.4%
D R Horton Inc Exited −66,541 −$9.13M —
Builders Firstsource Inc Exited −98,203 −$8.09M —
Ati Inc Trimmed −31,365 −$6.18M 8.7%
Constellium Se Trimmed −176,360 −$5.62M 11.2%
CA Century Alum Co Trimmed −80,688 −$3.71M 16.8%

Showing the 10 largest of 17 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
HG Harmony Gold Mng Ltd New +666,735 +$10.2M 5.1%
Ati Inc Trimmed −37,125 −$5.4M 6.6%
Nexgen Energy Ltd Exited −538,042 −$4.95M —
SJ San Juan Basin Rty Tr Exited −732,351 −$4.12M —
Sensient Technologies Corp Added +39,494 +$3.41M 6.7%
Hudbay Minerals Inc Trimmed −81,207 −$1.7M 7.3%
AM Ardagh Metal Packaging S A Added +408,602 +$1.65M 3.8%
Freeport Mcmoran Inc Trimmed −25,354 −$1.49M 7.0%
CA Century Alum Co Trimmed −24,478 −$1.44M 17.0%
Standardaero Inc Added +39,937 +$1.03M 5.2%

Showing the 10 largest of 16 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 13, 2026

Company Action Shares changed Value of change % of portfolio
EC Everus Constr Group Exited −169,844 −$14.6M —
Entegris Inc Exited −123,234 −$11.4M —
Vishay Intertechnology Inc Exited −742,177 −$11.4M —
Sensient Technologies Corp New +117,090 +$11M 6.2%
D R Horton Inc Added +37,128 +$5.35M 5.2%
FG Frontier Group Hldgs Inc New +953,375 +$4.49M 2.5%
Uranium Energy Corp Exited −320,952 −$4.28M —
Cameco Corp New +42,424 +$3.88M 2.2%
Builders Firstsource Inc Added +33,332 +$3.43M 5.4%
Hudbay Minerals Inc Trimmed −168,172 −$3.34M 8.7%

Showing the 10 largest of 21 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

Company Action Shares changed Value of change % of portfolio
D R Horton Inc New +27,876 +$4.72M 2.7%
Uranium Energy Corp New +320,952 +$4.28M 2.5%
EC Everus Constr Group Trimmed −36,374 −$3.12M 8.5%
Hudbay Minerals Inc Trimmed −169,013 −$2.56M 8.4%
Ati Inc Added +21,050 +$1.71M 6.8%
Freeport-mcmoran Inc Added +41,088 +$1.61M 6.7%
CA Century Alum Co Trimmed −44,107 −$1.29M 11.3%
Entegris Inc Trimmed −2,996 −$277K 6.6%
Alcoa Corp Trimmed −8,139 −$268K 5.7%
Carpenter Technology Corp Added +867 +$213K 5.8%

Showing the 10 largest of 13 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
Carpenter Technology Corp New +39,982 +$11.1M 7.3%
Standardaero Inc New +290,730 +$9.2M 6.1%
Kirby Corp New +65,431 +$7.42M 4.9%
D R Horton Inc Exited −53,655 −$6.82M —
Ati Inc Trimmed −58,405 −$5.04M 7.0%
Constellium Se Added +303,614 +$4.04M 7.4%
Entegris Inc Added +27,701 +$2.23M 6.7%
AM Ardagh Metal Packaging S A Added +480,764 +$2.06M 4.4%
Vishay Intertechnology Inc Added +83,027 +$1.32M 7.8%
EC Everus Constr Group Trimmed −20,639 −$1.31M 8.7%

Showing the 10 largest of 15 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
Ge Vernova Inc Exited −29,373 −$9.66M —
Materion Corp Exited −79,742 −$7.88M —
Scorpio Tankers Inc Exited −117,417 −$5.83M —
Constellium Se Trimmed −345,171 −$3.48M 5.2%
EC Everus Constr Group Added +64,135 +$2.38M 8.1%
Vishay Intertechnology Inc Added +142,908 +$2.27M 10.0%
Hudbay Minerals Inc Added +56,492 +$429K 8.4%
D R Horton Inc Added +2,640 +$336K 6.5%
Builders Firstsource Inc Added +2,336 +$292K 7.0%
Alcoa Corp Added +8,187 +$250K 7.8%

Showing the 10 largest of 14 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 14, 2025

Company Action Shares changed Value of change % of portfolio
CA Century Alum Co Trimmed −759,986 −$13.8M 8.6%
EC Everus Constr Group New +162,722 +$10.7M 7.8%
Vishay Intertechnology Inc Trimmed −585,708 −$9.92M 6.4%
Constellium Se Added +338,105 +$3.47M 6.7%
AM Ardagh Metal Packaging S A New +1,057,720 +$3.18M 2.3%
Ge Vernova Inc Trimmed −9,192 −$3.02M 7.1%
Ati Inc Added +42,020 +$2.31M 7.4%
Alcoa Corp Trimmed −22,053 −$833K 7.1%
Freeport-mcmoran Inc Added +7,795 +$297K 6.9%
Materion Corp Trimmed −2,034 −$201K 5.8%

Showing the 10 largest of 13 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 15, 2024

Company Action Shares changed Value of change % of portfolio
Vishay Intertechnology Inc Trimmed −931,474 −$17.6M 13.0%
Diamondback Energy Inc Exited −56,504 −$11.3M —
Builders Firstsource Inc New +55,875 +$10.8M 6.8%
Ge Vernova Inc New +38,565 +$9.83M 6.1%
D R Horton Inc New +50,921 +$9.71M 6.1%
West Fraser Timber Co Ltd Exited −122,541 −$9.41M —
Olin Corp Exited −187,085 −$8.82M —
Transocean Ltd Exited −901,657 −$4.82M —
Ati Inc Trimmed −68,423 −$4.58M 5.9%
Entegris Inc Added +30,618 +$3.45M 6.9%

Showing the 10 largest of 19 changes.

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