Statement of Changes in Beneficial Ownership (4)

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

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3235-0287

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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 & CEO
(Last)          (First)          (Middle) C/O CENTURY ALUMINUM COMPANY, ONE SOUTH WACKER DRIVE, SUITE 1000	3. Date of Earliest Transaction (MM/DD/YYYY) 7/1/2021
(Street) CHICAGO, IL 60606 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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	7/1/2021		A		171276 (1)	A	$0	332732 (2)	D
Common Stock								64400 (3)	I	By Trust

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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

Explanation of Responses:
(1)	Represents awards granted to the Reporting Person consisting of (i) 13,740 time vesting share units under the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023 and (ii) 157,536 time vesting share units, 78,768 of which vest in the ordinary course on July 1, 2022, 47,261 of which vest in the ordinary course on July 1, 2023 and 31,507 of which vest in the ordinary course on July 1, 2024.
(2)	Includes unvested time vesting share units granted to the Reporting Person (i) pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d) and (ii) 157,536 time vesting share units, 78,768 of which vest in the ordinary course on July 1, 2022, 47,261 of which vest in the ordinary course on July 1, 2023 and 31,507 of which vest in the ordinary course on July 1, 2024.
(3)	Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes. The Reporting Person serves as the trustee of the trust.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Gary Jesse E C/O CENTURY ALUMINUM COMPANY ONE SOUTH WACKER DRIVE, SUITE 1000 CHICAGO, IL 60606	X		President & CEO

Signatures
/s/ John DeZee, Attorney-in-Fact for Jesse E. Gary		7/2/2021
**Signature of Reporting Person		Date