Century Aluminum (CENX) HR executive sells 18,000 shares at $58

Rhea-AI Filing Summary

Century Aluminum senior vice president of human resources Kenneth L. Calloway reported an open-market sale of 18,000 shares of common stock at $58 per share. After this transaction, he directly holds 24,902 shares, which include unvested RSUs granted under the company’s long-term incentive plans.

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

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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^*

Calloway Kenneth L

(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, Human Resources

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

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	03/12/2026		S		18,000	D	$58	24,902(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 Kenneth L. Calloway	03/13/2026
	** 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).
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FAQ

What insider transaction did Kenneth L. Calloway report for CENTURY ALUMINUM CO (CENX)?

Kenneth L. Calloway reported selling 18,000 shares of Century Aluminum common stock in an open-market transaction. The sale was disclosed on a Form 4 filing and reflects a direct disposition of shares by the company’s senior vice president of human resources.

At what price did Kenneth L. Calloway sell Century Aluminum (CENX) shares?

Kenneth L. Calloway sold his Century Aluminum common shares at a price of $58 per share. This reported price represents the transaction value for the 18,000 shares sold in the open market, as disclosed in the Form 4 insider filing.

How many Century Aluminum (CENX) shares does Kenneth L. Calloway hold after the sale?

After selling 18,000 shares, Kenneth L. Calloway directly holds 24,902 Century Aluminum common shares. This amount includes unvested restricted stock units granted to him under the company’s long-term incentive plans, according to the footnote disclosure in the Form 4 filing.

What is Kenneth L. Calloway’s role at Century Aluminum (CENX) in this Form 4 filing?

In the Form 4 filing, Kenneth L. Calloway is identified as the senior vice president of human resources at Century Aluminum. His position indicates he is an executive officer, which requires reporting his transactions in company stock to provide transparency to shareholders.

Does Kenneth L. Calloway’s reported Century Aluminum (CENX) holding include RSUs?

Yes. A footnote states that his reported holdings include unvested restricted stock units granted under Century Aluminum’s long-term incentive plans. This means the 24,902 shares shown after the transaction consist of both owned shares and unvested RSUs tied to his executive compensation.

Was Kenneth L. Calloway’s Century Aluminum (CENX) transaction an open-market sale?

Yes. The Form 4 classifies the transaction with code “S” and describes it as an open-market or private sale. The filing further labels the action as an open-market sale, indicating the 18,000 shares were sold through regular trading rather than a derivative or gift transaction.