Glencore International trims Century Aluminum (CENX) stake with 6.3M-share sale

Rhea-AI Filing Summary

Glencore International AG, a major shareholder of Century Aluminum, reported an open-market sale of 6,315,245 shares of common stock at $51.75 per share. After this transaction, Glencore International AG held 12,184,755 shares of Century Aluminum common stock.

The filing also lists Glencore plc and Glencore AG as reporting persons. The footnote explains that the shares sold and held are directly owned by Glencore International AG, while Glencore plc, as its parent, may be deemed an indirect beneficial owner of these securities.

Insights

Equity capital markets analyst

Large shareholder Glencore International AG disclosed a significant open-market sale of Century Aluminum shares.

Glencore International AG, identified as a more than ten percent owner, executed an open-market sale of 6,315,245 common shares at $51.75 per share. Following the sale, its reported ownership stands at 12,184,755 shares of Century Aluminum common stock.

The filing clarifies via footnote that these shares are held directly by Glencore International AG, while Glencore plc, its parent, may be deemed an indirect beneficial owner of securities held by Glencore International AG and Glencore AG. This structure concentrates the disclosed transaction at the subsidiary level.

For investors analyzing ownership dynamics, this Form 4 documents a net-sell transaction by a large shareholder on March 4, 2026. Subsequent company filings may provide additional context on any further changes in significant shareholdings.

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

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

GLENCORE INTERNATIONAL AG

(Last) (First) (Middle)

BAARERMATTSTRASSE 3

P.O. BOX 1363

(Street)

BAAR V8 CH-6341

(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)
03/04/2026

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
Common Stock	03/04/2026		S		6,315,245	D	$51.75	12,184,755	D(1)

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

1. Name and Address of Reporting Person^*

GLENCORE INTERNATIONAL AG

(Last) (First) (Middle)

BAARERMATTSTRASSE 3

P.O. BOX 1363

(Street)

BAAR V8 CH-6341

(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 AG

(Last) (First) (Middle)

BAARERMATTSTRASSE 3

P.O. BOX 1363

(Street)

BAAR V8 CH-6341

(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-6341

(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. The Common Stock reported on Line 1 of Table I is held directly by Glencore International AG. Glencore International AG is wholly-owned by Glencore plc, which may be deemed an indirect beneficial owner of the securities held by Glencore AG and Glencore International AG.

	GLENCORE AG By: /s/ John Burton Name: John Burton Title: Attorney-in-Fact	03/04/2026
	GLENCORE INTERNATIONAL AG By: /s/ John Burton Name: John Burton Title: Attorney-in-Fact	03/04/2026
	GLENCORE PLC By: /s/ John Burton Name: John Burton Title: Company Secretary	03/04/2026
	** Signature of Reporting Person	Date
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FAQ

What did Glencore International AG report in its Form 4 for CENX?

Glencore International AG reported an open-market sale of 6,315,245 shares of Century Aluminum common stock at $51.75 per share. After this transaction, it held 12,184,755 shares, remaining a significant shareholder in the company.

Who are the reporting persons in the Century Aluminum (CENX) Form 4?

The Form 4 lists Glencore International AG, Glencore AG, and Glencore plc as reporting persons, each identified as more than ten percent owners. The footnote explains that Glencore International AG directly holds the shares, while Glencore plc may be an indirect beneficial owner.

How many Century Aluminum (CENX) shares were sold and at what price?

The Form 4 shows a sale of 6,315,245 shares of Century Aluminum common stock in an open-market transaction. The reported sale price was $51.75 per share, reflecting a single, large disposition by Glencore International AG on the transaction date.

How many Century Aluminum (CENX) shares does Glencore International AG hold after the sale?

Following the reported transaction, Glencore International AG held 12,184,755 shares of Century Aluminum common stock. This post-transaction figure indicates it remains a large shareholder, even after selling more than six million shares in the disclosed trade.

What does the Form 4 footnote say about Glencore plc’s ownership in CENX?

The footnote states that the common stock is held directly by Glencore International AG, which is wholly owned by Glencore plc. As a result, Glencore plc may be deemed an indirect beneficial owner of the securities held by Glencore AG and Glencore International AG.

Was the Century Aluminum (CENX) transaction a buy or a sell?

The transaction was a sale. The Form 4 uses transaction code “S” and describes it as a sale in an open market or private transaction, with Glencore International AG disposing of 6,315,245 Century Aluminum common shares at a price of $51.75 per share.