Peter A. Trpkovski - 31 Dec 2025 Form 4 Insider Report for CENTURY ALUMINUM CO (CENX)

Role
EVP, CFO and Treasurer
Signature
/s/ Paul Sharobeem, as attorney in fact for Peter A. Trpkovski
Issuer symbol
CENX
Transactions as of
31 Dec 2025
Net transactions value
-$475,449
Form type
4
Filing time
05 Jan 2026, 16:55:21 UTC
Previous filing
25 Mar 2025
Next filing
11 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Trpkovski Peter A EVP, CFO and Treasurer C/O CENTURY ALUMINUM COMPANY, 1 S. WACKER DRIVE, SUITE 1000, CHICAGO /s/ Paul Sharobeem, as attorney in fact for Peter A. Trpkovski 05 Jan 2026 0001980271

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CENX Common Stock Award $0 +18,260 +28% $0.000000 83,751 31 Dec 2025 Direct F1
transaction CENX Common Stock Tax liability $316,966 -8,090 -9.7% $39.18 75,661 31 Dec 2025 Direct F2
transaction CENX Common Stock Tax liability $158,483 -4,045 -5.3% $39.18 71,616 31 Dec 2025 Direct F3
transaction CENX Common Stock Award $0 +13,488 +19% $0.000000 85,104 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.