Century Aluminum (CENX) SVP sells 22884 common shares

Rhea-AI Filing Summary

Century Aluminum Company executive Agust F. Hafberg, the SVP & Chief Commercial Officer, reported an open-market sale of 22884 shares of common stock on February 27, 2026 at $51.24 per share.

After this transaction, he directly holds 45059 shares, which the filing notes include unvested restricted stock units granted under the company’s long-term incentive plans.

Insider Trade Summary

Net Seller: 22,884 shares ($1,172,576)

Net Sell 1 txn

Insider Hafberg Agust F

Role SVP & Chief Commercial Officer

Sold 22,884 shs ($1.17M)

Type	Security	Shares	Price	Value
Sale	Common Stock	22,884	$51.24	$1.17M

Holdings After Transaction: Common Stock — 45,059 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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).

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^*

Hafberg Agust F

(Last) (First) (Middle)

C/O CENTURY ALUMINUM COMPANY

1 S. WACKER DRIVE, SUITE 1000

(Street)

CHICAGO IL 60606

(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		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP & Chief Commercial Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

4. If Amendment, Date of 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

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	02/27/2026		S		22,884	D	$51.24	45,059(1)	D

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

Explanation of Responses:

1. Includes unvested RSUs granted to the Reporting Person under the Issuer's Long-Term Incentive Plans.

Remarks:

	/s/ Paul Sharobeem, attorney-in-fact for Agust F. Hafberg	03/03/2026
	** 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.

FAQ

What insider transaction did CENX report for Agust F. Hafberg?

Century Aluminum reported that Agust F. Hafberg, SVP & Chief Commercial Officer, sold 22884 shares of common stock in an open-market transaction at $51.24 per share. Following the sale, he directly holds 45059 shares, including unvested restricted stock units under long-term incentive plans.

What price did the CENX insider receive per share in this Form 4?

The reported sale by Century Aluminum executive Agust F. Hafberg was executed at $51.24 per share. This price applies to all 22884 common shares sold in the open-market transaction disclosed, providing clear transparency into the per-share value of this insider sale.

How many Century Aluminum (CENX) shares does Agust F. Hafberg hold after the sale?

After selling 22884 shares, Agust F. Hafberg directly holds 45059 Century Aluminum common shares. The filing notes that this figure includes unvested restricted stock units previously granted to him under the company’s long-term incentive plans, indicating both vested and unvested equity are reflected.

What role does the insider in this CENX Form 4 hold at the company?

The reporting person in this Form 4, Agust F. Hafberg, serves as Senior Vice President & Chief Commercial Officer of Century Aluminum. His position is identified in the filing, clarifying that the transaction involves a senior executive with commercial leadership responsibilities at the company.

Does the CENX Form 4 mention unvested RSUs for the reporting person?

Yes. A footnote explains that the share amount held after the transaction includes unvested restricted stock units granted to Agust F. Hafberg under Century Aluminum’s long-term incentive plans, indicating that both unvested RSUs and other directly held shares are counted in the reported total.