CENX Century Aluminum Co

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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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 * Glencore AG	2. Issuer Name and Ticker or Trading Symbol CENTURY ALUMINUM CO [ CENX ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    __X__ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) BAARERMATTSTRASSE 3, P.O. BOX 1301	3. Date of Earliest Transaction (MM/DD/YYYY) 6/30/2021
(Street) BAAR, V8 CH-6341 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _ X _ 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	6/30/2021		C		17768	A	(1)(2)	11178573	D (3)

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
Series A Convertible Preferred Stock	(2)	6/30/2021		C			177.68	(2)	(2)	Common Stock	17768	(2)	63273.74	D (3)

Explanation of Responses:
(1)	Represents shares of Common Stock acquired upon conversion of 177.68 shares of Series A Convertible Preferred Stock on June 30, 2021.
(2)	Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.
(3)	The shares of Common Stock reported in Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by Glencore International AG and its parent, Glencore plc.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Glencore AG BAARERMATTSTRASSE 3 P.O. BOX 1301 BAAR, V8 CH-6341		X
GLENCORE INTERNATIONAL AG BAARERMATTSTRASSE 3 P.O. BOX 1363 BAAR, V8 CH-6341		X
Glencore plc BAARERMATTSTRASSE 3 BAAR, V8 CH-6341		X

Signatures
GLENCORE AG: By: /s/ Stephan Huber; Name: Stephan Huber; Title: Director		7/1/2021
**Signature of Reporting Person		Date
GLENCORE AG: By: /s/ Martin Haering; Name: Martin Haering; Title: Director		7/1/2021
**Signature of Reporting Person		Date
GLENCORE INTERNATIONAL AG: By: /s/ Martin Haering; Name: Martin Haering; Title: Officer		7/1/2021
**Signature of Reporting Person		Date
GLENCORE INTERNATIONAL AG: By: /s/ Derrick Crowley; Name: Derrick Crowley; Title: Officer		7/1/2021
**Signature of Reporting Person		Date
GLENCORE PLC: By: /s/ John Burton; Name: John Burton; Title: Company Secretary		7/1/2021
**Signature of Reporting Person		Date