Century Aluminum (CENX) CEO completes 150K-share 10b5-1 stock sale

Rhea-AI Filing Summary

Century Aluminum President and CEO Gary Jesse reported an open-market sale of 150,000 shares of Common Stock at a weighted average price of $55.47 per share, executed under a Rule 10b5-1 trading plan adopted on August 20, 2025.

The sale was executed by a self-settled, revocable trust for which he serves as trustee, at prices ranging from $54.08 to $56.80. After the transaction, he indirectly held 142,580 shares through the trust and directly held 277,227 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

OMB APPROVAL

OMB Number:			3235-0287
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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).

X

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^*

Gary Jesse E

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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(1)	03/16/2026		S		150,000	D	$55.47(2)	142,580(3)	I	By Trust
Common Stock								277,227(4)	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. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 20, 2025 (the 'Trading Plan'). There are no additional shares available for sale under the Trading Plan and, as such, the Trading Plan is now complete.

2. The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $54.08 to $56.80, inclusive. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the specific number of shares and prices at which the transactions were effected.

3. Shares held in a self-settled, revocable trust for which the Reporting Person serves as trustee.

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

Remarks:

	/s/ Paul Sharobeem, attorney-in-fact for Jesse E. Gary	03/17/2026
	** 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 did Century Aluminum (CENX) CEO Gary Jesse report in this Form 4?

Gary Jesse reported an open-market sale of 150,000 Century Aluminum shares at a weighted average price of $55.47 per share. The transaction was executed under a pre-established Rule 10b5-1 trading plan and involved shares held in a revocable trust he controls.

At what prices were Gary Jesse’s Century Aluminum (CENX) shares sold?

The reported sale used a weighted average price of $55.47 per share. Footnotes state the shares were sold in multiple transactions, with prices ranging from $54.08 to $56.80, and full trade details are available on request to relevant parties.

Was the Century Aluminum (CENX) CEO’s share sale part of a Rule 10b5-1 plan?

Yes. The filing notes the sale was made under a Rule 10b5-1 trading plan adopted on August 20, 2025. The plan now has no additional shares available for sale, and the company states that this trading plan is complete.

How many Century Aluminum (CENX) shares does Gary Jesse hold after this sale?

Following the transaction, Gary Jesse indirectly held 142,580 shares through a self-settled revocable trust. He also directly held 277,227 shares of Century Aluminum common stock, which the filing explains include unvested restricted stock units granted under long-term incentive plans.

How are the sold Century Aluminum (CENX) shares held for the CEO?

The sold shares were held in a self-settled, revocable trust for which Gary Jesse serves as trustee. This structure gives him control over the trust’s holdings, and the filing attributes the reported open-market sale to that trust account.

Do Gary Jesse’s remaining Century Aluminum (CENX) holdings include unvested RSUs?

Yes. The filing states his 277,227 directly held shares include unvested restricted stock units granted under Century Aluminum’s long-term incentive plans. These RSUs represent compensation that vests over time rather than previously purchased common shares.