SEC Form 4 · Updated Daily

CENX

— CENTURY ALUMINUM COMPANY Ownership

Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.

Financials Ownership

Current Reporting Owners

Owner	Role	Shares Owned	As Of	Last Activity
GLENCORE INTERNATIONAL AG	10%+ Owner	12,184,755	2026-03-04	S
Glencore AG	10%+ Owner	12,184,755	2026-03-04	S
Glencore plc	10%+ Owner	12,184,755	2026-03-04	S
Berntzen Jarl	Director	211,123	2026-06-15	A
Gary Jesse E	Director · Officer	142,580	2026-03-16	S
Gudlaugsson Gunnar	Officer	136,393	2026-02-25	S
GLASSER ERROL	Director	120,869	2026-06-15	A
DeZee John	Officer	97,647	2026-02-23	S
Michelmore Andrew G	Director	90,609	2026-06-15	F
Aboud Matt	Officer	64,843	2026-03-03	S
Trpkovski Peter A	Officer	64,125	2026-03-25	S
Hoffman Robert F	Officer	56,643	2026-03-11	S
Bush Jennifer Mary	Director	49,044	2026-06-15	A
Hafberg Agust F	Officer	45,059	2026-02-27	S
Olivier Tamla A	Director	31,845	2026-06-15	A
Calloway Kenneth L	Officer	24,902	2026-03-12	S

Recent Filings

Date	Owner	Activity	Shares	Price	Owned After
2026-06-15	Olivier Tamla A	Grant / award	2,172	$0.00	31,845
2026-06-15	Bush Jennifer Mary	Grant / award	2,172	$0.00	49,044
2026-06-15	Michelmore Andrew G	Tax withholding	652	$54.55	90,609
2026-06-15	Michelmore Andrew G	Grant / award	2,172	$0.00	91,261
2026-06-15	GLASSER ERROL	Grant / award	2,172	$0.00	120,869
2026-06-15	Berntzen Jarl	Grant / award	2,172	$0.00	211,123
2026-03-25	Trpkovski Peter A	Open-market sale	16,739	$50.51	64,125
2026-03-16	Gary Jesse E	Open-market sale	150,000	$55.47	142,580
2026-03-12	Calloway Kenneth L	Open-market sale	18,000	$58.00	24,902
2026-03-11	Hoffman Robert F	Open-market sale	10,529	$56.51	56,643
2026-03-04	Glencore plc	Open-market sale	6,315,245	$51.75	12,184,755
2026-03-04	Glencore AG	Open-market sale	6,315,245	$51.75	12,184,755
2026-03-04	GLENCORE INTERNATIONAL AG	Open-market sale	6,315,245	$51.75	12,184,755
2026-03-04	Hoffman Robert F	Open-market sale	10,000	$56.33	67,172
2026-03-03	Aboud Matt	Open-market sale	2,971	$52.67	64,843
2026-03-02	Aboud Matt	Open-market sale	12,126	$52.50	67,814
2026-02-27	Hafberg Agust F	Open-market sale	22,884	$51.24	45,059
2026-02-25	Gudlaugsson Gunnar	Open-market sale	43,000	$54.10	136,393
2026-02-23	DeZee John	Open-market sale	66,000	$50.72	97,647
2026-02-09	Trpkovski Peter A	Tax withholding	4,240	$54.36	80,864
2026-01-23	Gary Jesse E	Open-market sale	150,000	$48.19	292,580
2026-01-12	Gary Jesse E	Gift	314,611	$0.00	442,580
2026-01-12	Gary Jesse E	Gift	314,611	$0.00	277,227
2026-01-01	Aboud Matt	Grant / award	5,529	$0.00	79,940
2026-01-01	Calloway Kenneth L	Grant / award	5,238	$0.00	42,902
2026-01-01	DeZee John	Grant / award	9,821	$0.00	163,647
2026-01-01	Hoffman Robert F	Grant / award	5,122	$0.00	77,172
2026-01-01	Trpkovski Peter A	Grant / award	13,488	$0.00	85,104
2026-01-01	Hafberg Agust F	Grant / award	5,238	$0.00	67,943
2026-01-01	Gudlaugsson Gunnar	Grant / award	15,624	$0.00	179,393
2026-01-01	Gary Jesse E	Grant / award	57,443	$0.00	591,838
2025-12-31	Aboud Matt	Tax withholding	8,243	$39.18	74,411
2025-12-31	Aboud Matt	Tax withholding	16,485	$39.18	82,654
2025-12-31	Aboud Matt	Grant / award	36,550	$0.00	99,139
2025-12-31	Calloway Kenneth L	Tax withholding	3,723	$39.18	37,664
2025-12-31	Calloway Kenneth L	Tax withholding	5,469	$39.18	41,387
2025-12-31	Calloway Kenneth L	Grant / award	18,150	$0.00	46,856
2025-12-31	DeZee John	Tax withholding	11,971	$39.18	153,826
2025-12-31	DeZee John	Tax withholding	21,163	$39.18	165,797
2025-12-31	DeZee John	Grant / award	54,042	$0.00	186,960

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.