Century Aluminum (CENX) EVP Gudlaugsson sells 43,000 shares

Rhea-AI Filing Summary

Century Aluminum Company executive vice president of global operations Gunnar Gudlaugsson reported an open-market sale of common stock. On February 25, 2026, he sold 43,000 shares at $54.10 per share. After this transaction, he held 136,393 shares, which the disclosure notes include unvested restricted stock units granted under the company’s long-term incentive plans.

Insider Trade Summary

Net Seller: 43,000 shares ($2,326,300)

Net Sell 1 txn

Insider Gudlaugsson Gunnar

Role EVP - Global Operations

Sold 43,000 shs ($2.33M)

Type	Security	Shares	Price	Value
Sale	Common Stock	43,000	$54.10	$2.33M

Holdings After Transaction: Common Stock — 136,393 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^*

Gudlaugsson Gunnar

(Last) (First) (Middle)

C/O CENTURY ALUMINUM COMPANY

1 S. WACKER DR., 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)
	EVP - Global Operations

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

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	02/25/2026		S		43,000	D	$54.1	136,393(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, as attorney in fact for Gunnar Gudlaugsson	02/27/2026
	** 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 Century Aluminum (CENX) report for Gunnar Gudlaugsson?

Century Aluminum reported that EVP of Global Operations Gunnar Gudlaugsson sold 43,000 shares of common stock. The transaction occurred on February 25, 2026, as an open-market sale at a reported price of $54.10 per share.

At what price did Gunnar Gudlaugsson sell Century Aluminum (CENX) shares?

Gunnar Gudlaugsson sold Century Aluminum common stock at a reported price of $54.10 per share. This price applies to the 43,000 shares involved in his February 25, 2026 open-market sale transaction disclosed in the insider report.

How many Century Aluminum (CENX) shares does Gunnar Gudlaugsson hold after the sale?

After the reported sale, Gunnar Gudlaugsson beneficially owned 136,393 Century Aluminum common shares. The disclosure specifies that this figure includes unvested restricted stock units granted to him under the company’s long-term incentive plans.

What role does Gunnar Gudlaugsson hold at Century Aluminum (CENX)?

Gunnar Gudlaugsson serves as Executive Vice President of Global Operations at Century Aluminum. His position is identified in the insider report, which links his leadership role to the disclosed open-market sale of common stock.

Does Gunnar Gudlaugsson’s Century Aluminum (CENX) holding include unvested RSUs?

Yes. The filing states that Gudlaugsson’s reported beneficial ownership of 136,393 shares includes unvested restricted stock units. These RSUs were granted to him under Century Aluminum’s long-term incentive plans and are counted within the disclosed share total.