Form 4 for CENX CENTURY ALUMINUM CO

Accepted 2026-01-05 00:00:00 ET · period of report 2025-12-31 · accession 0001628280-26-000589 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
M	2026-01-05	2025-12-31	CENX	Gudlaugsson Gunnar	EVP - Gbl Ops	F - Tax	$39.18	-62.8K	163.8K	-28%	-$2.46M
M	2026-01-05	2025-12-31+	CENX	Gudlaugsson Gunnar	EVP - Gbl Ops	A - Grant	$0.00	+98.4K	179.4K	+122%	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2025-12-31	F	D	41,886	$39.18	184,712	D	—	—	(F2) Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of PSUs granted to the Reporting Person.
2	Common	Common Stock	2025-12-31	A	A	82,794	$0.00	226,598	D	—	—	(F1) Represents shares of common stock acquired by the Reporting Person upon the vesting of PSUs granted in connection with the Issuer's 2023-2025 Long-Term Incentive Plan under Rule 16b-3(d).
3	Common	Common Stock	2025-12-31	F	D	20,943	$39.18	163,769	D	—	—	(F3) Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of RSUs previously granted to the Reporting Person on January 1, 2023.
4	Common	Common Stock	2026-01-01	A	A	15,624	$0.00	179,393	D	—	—	(F4) Represents RSUs granted to the Reporting Person in connection with the Issuer's 2026-2028 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest on December 31, 2028, subject to the Plan's terms and conditions. (F5) Includes unvested RSUs granted to the Reporting Person under the Issuer's Long-Term Incentive Plans.