Gunnar Gudlaugsson - 31 Dec 2025 Form 4 Insider Report for CENTURY ALUMINUM CO (CENX)

Role
EVP - Global Operations
Signature
/s/ Paul Sharobeem, as attorney in fact for Gunnar Gudlaugsson
Issuer symbol
CENX
Transactions as of
31 Dec 2025
Net transactions value
-$2,461,640
Form type
4
Filing time
05 Jan 2026, 17:00:48 UTC
Previous filing
03 Jan 2025
Next filing
27 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Gudlaugsson Gunnar EVP - Global Operations C/O CENTURY ALUMINUM COMPANY, 1 S. WACKER DR., SUITE 1000, CHICAGO /s/ Paul Sharobeem, as attorney in fact for Gunnar Gudlaugsson 05 Jan 2026 0001846594

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CENX Common Stock Award $0 +82,794 +58% $0.000000 226,598 31 Dec 2025 Direct F1
transaction CENX Common Stock Tax liability $1,641,093 -41,886 -18% $39.18 184,712 31 Dec 2025 Direct F2
transaction CENX Common Stock Tax liability $820,547 -20,943 -11% $39.18 163,769 31 Dec 2025 Direct F3
transaction CENX Common Stock Award $0 +15,624 +9.5% $0.000000 179,393 01 Jan 2026 Direct F4, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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).
F2 Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of PSUs granted to the Reporting Person.
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.
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.