SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* GLENCORE INTERNATIONAL AG (Last) (First) (Middle) BAARERMATTSTRASSE 3 P.O. BOX 1363 (Street) BAAR V8 CH-6340 (City) (State) (Zip)	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)
	3. Date of Earliest Transaction (Month/Day/Year) 05/07/2021
	4. If Amendment, Date of Original Filed (Month/Day/Year)	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. 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

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 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: 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
Cash Settled Total Return Swap	(1)(2)(4)	05/07/2021(4)		X/K			1	(1)(2)(4)	(1)(2)(4)	Common Stock	4,400,000(1)(2)	(1)(2)(3)(4)	0(1)(2)(4)	D(1)(5)

1. Name and Address of Reporting Person* GLENCORE INTERNATIONAL AG (Last) (First) (Middle) BAARERMATTSTRASSE 3 P.O. BOX 1363 (Street) BAAR V8 CH-6340 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Glencore plc (Last) (First) (Middle) BAARERMATTSTRASSE 3 P.O. BOX 1363 (Street) BAAR V8 CH-6340 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

2. Upon expiration of the Swap, (i) Glencore International is obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted average price of the common stock from the $16.6582 per share volume weighted average price calculated during the initial averaging period for the Swap in March 2011 to the volume weighted average price of the common stock during the final valuation period at the expiration of the term of the Swap, or (ii) Citi is obligated to make a cash payment to Glencore International with respect to any appreciation in such volume weighted average price during the same period.

3. Under the terms of the Swap, generally, Glencore International was obligated to pay to Citi certain fees and commissions and Citi was obligated to pay to Glencore International an amount in cash equal to any dividends that would have been paid by the issuer on the number of shares referenced by the Swap.

4. On April 17, 2021 the Swap expired in accordance with its terms and a net settlement amount of $4,039,728 (equal to the difference between (i) a final valuation amount based on the volume weighted average price of the common stock during a final valuation period ending on May 7, 2021, and (ii) the original valuation amount equal to the per share initial reference price of $16.6582 multiplied by the 4,400,000 shares referenced by the Swap), became due from Glencore International to Citi.

5. The Swap was held directly by Glencore International, and may be deemed to have been beneficially owned indirectly by Glencore plc. The Swap did not give the reporting persons direct or indirect voting, investment or dispositive control over any securities of the issuer, and accordingly, the reporting persons disclaim any beneficial ownership in the shares of common stock referenced by the swaps.

	GLENCORE INTERNATIONAL AG: By: /s/ John Burton; Name: John Burton; Title: Director	05/10/2021
	GLENCORE INTERNATIONAL AG: By: /s/ Martin Haering; Name: Martin Haering; Title: Officer	05/10/2021
	GLENCORE PLC: By: /s/ John Burton; Name: John Burton; Title: Company Secretary	05/10/2021
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.