FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Gary Jesse E
  2. Issuer Name and Ticker or Trading Symbol
CENTURY ALUMINUM CO [CENX] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President and CEO
(Last)
(First)
(Middle)
C/O CENTURY ALUMINUM COMPANY, 1 S. WACKER DRIVE, SUITE 1000		 3. Date of Earliest Transaction (Month/Day/Year)
12/31/2023
(Street)

CHICAGO, IL 60606		 4. If Amendment, Date Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4) 		7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 12/31/2023   A   26,745 (1) A $ 0 303,013 D  
Common Stock 12/31/2023   F   11,849 (2) D $ 12.14 291,164 D  
Common Stock 12/31/2023   F   24,742 (3) D $ 12.14 266,422 D  
Common Stock 01/01/2024   A   135,746 (4) A $ 0 402,168 (5) D  
Common Stock               76,443 (6) I By Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5) 		6. Date Exercisable and Expiration Date
(Month/Day/Year) 		7. Title and Amount of Underlying Securities
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4) 		10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4) 		11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Gary Jesse E
C/O CENTURY ALUMINUM COMPANY
1 S. WACKER DRIVE, SUITE 1000
CHICAGO, IL 60606		   X     President and CEO  

Signatures

 /s/ Paul Sharobeem, attorney-in-fact for Jesse E. Gary   01/03/2024
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents shares of common stock acquired by the Reporting Person upon the vesting of PSUs granted in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d).
(2) Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of PSUs granted to the Reporting Person.
(3) Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of TVSUs previously granted to the Reporting Person on January 2, 2021 in the amount of 42,110 shares and on July 1, 2021 in the amount of 13,740 shares.
(4) Represents TVSUs granted to the Reporting Person in connection with the Issuer's 2024-2026 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest on December 31, 2026, subject to the Plan's terms and conditions.
(5) Includes unvested TVSUs granted to the Reporting Person under the Issuer's Long-Term Incentive Plans.
(6) Shares held in a self-settled, revocable trust for which the Reporting Person serves as trustee.

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