Mountaineer Partners Management, LLC

Position in CENX — Century Aluminum Co

CIK 1730532 New York, NY

Position in CENX

as of Jun 30, 2026 · filed Aug 13, 2026 Compact

Position Value

$23,157,247

-$11,117,536 QoQ

Shares Held

503,309

-13.8% QoQ

Ownership

0.508%

of shares outstanding

% of Portfolio

17.18%

of 13F equity value

Holder Rank

#34

of 414 holders

Holding Since

Dec 2021

17 quarters on record

Voting authority Sole 90% Shared 0% None 10%

Basic Materials · as of Jun 30, 2026

Mountaineer Partners Management, LLC holds $49,376,451 across 3 Aluminum names. CENX ranks #1 (46.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CENX	Century Aluminum Co This page	503,309	$23,157,247
2	CSTM	Constellium SE	482,130	$15,365,482
3	AA	Alcoa Corp	208,165	$10,853,722

17 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$23,157,247	503,309	-13.8%	Shares	Sole	2026-08-13
2026-03-31	$34,274,783	583,997	-4.0%	Shares	Sole	2026-05-15
2025-12-31	$23,840,050	608,475	-8.0%	Shares	Sole	2026-02-13
2025-09-30	$19,408,222	661,043	-6.3%	Shares	Sole	2025-11-14
2025-06-30	$12,706,802	705,150	+10.3%	Shares	Sole	2025-08-14
2025-03-31	$11,866,762	639,373	-1.3%	Shares	Sole	2025-05-15
2024-12-31	$11,803,735	647,845	-54.0%	Shares	Sole	2025-02-14
2024-09-30	$22,849,096	1,407,831	+5.2%	Shares	Sole	2024-11-15
2024-06-30	$22,419,171	1,338,458	-37.5%	Shares	Sole	2024-08-14
2024-03-31	$32,966,964	2,142,103	-5.7%	Shares	Sole	2024-05-15
2023-12-31	$27,567,572	2,270,805	+11.5%	Shares	Sole	2024-02-14
2023-09-30	$14,637,890	2,035,868	+1.9%	Shares	Sole	2023-11-14
2023-06-30	$17,416,830	1,997,343	+81.0%	Shares	Sole	2023-08-14
2023-03-31	$11,032,010	1,103,201	+14.5%	Shares	Sole	2023-05-15
2022-12-31	$7,879,940	963,318	+76.2%	Shares	Sole	2023-02-14
2022-03-31	$14,382,124	546,641	-21.9%	Shares	Sole	2022-05-16
2021-12-31	$11,596,222	700,255	—	Shares	Sole	2022-02-14
No filing history on record for this holder in this stock.