Century Aluminum (CENX) SVP sells 10,000 shares at $56.33

Rhea-AI Filing Summary

Century Aluminum senior vice president and chief accounting officer Robert F. Hoffman sold 10,000 shares of common stock in an open-market transaction on March 4, 2026, at a weighted average price of $56.33 per share, with individual trades ranging from $56.15 to $56.50.

After the sale, he directly owned 67,172 shares, which include unvested restricted stock units, and had an additional 14.5476 shares held indirectly through a 401(k) plan as reported by the plan trustee.

Insider Trade Summary

Net Seller: 10,000 shares ($563,300)

Net Sell 2 txns

Insider Hoffman Robert F

Role SVP, IT and CAO

Sold 10,000 shs ($563K)

Type	Security	Shares	Price	Value
Sale	Common Stock	10,000	$56.33	$563K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 67,172 shares (Direct); Common Stock — 14.548 shares (Indirect, By 401(k) plan)

Footnotes (1)

1. The price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $56.15 to $56.50, 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. Includes unvested RSUs granted to the Reporting Person under the Issuer's Long-Term Incentive Plans. As reported by 401(k) plan trustee on March 4, 2026.

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^*

Hoffman Robert 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, IT and CAO

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)

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	03/04/2026		S		10,000	D	$56.33(1)	67,172(2)	D
Common Stock								14.5476(3)	I	By 401(k) plan

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 price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $56.15 to $56.50, 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.

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

3. As reported by 401(k) plan trustee on March 4, 2026.

Remarks:

	/s/ Paul Sharobeem, attorney-in-fact for Robert F. Hoffman	03/06/2026
	** 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 executive Robert F. Hoffman report?

Robert F. Hoffman reported selling 10,000 Century Aluminum common shares in an open-market transaction. The sale occurred on March 4, 2026, and was executed at a weighted average price of $56.33 per share, within a range from $56.15 to $56.50.

What price did CENX shares sell for in Robert F. Hoffman's Form 4 filing?

The reported weighted average sale price was $56.33 per Century Aluminum share. Individual trades that made up the 10,000-share sale took place between $56.15 and $56.50, with the executive offering to provide detailed trade-level data upon request.

How many Century Aluminum shares does Robert F. Hoffman hold after this sale?

After the sale, Robert F. Hoffman directly owned 67,172 Century Aluminum common shares. That figure includes unvested restricted stock units granted under the company’s long-term incentive plans, plus an additional 14.5476 shares held indirectly through a 401(k) plan account.

What role does Robert F. Hoffman have at Century Aluminum (CENX)?

Robert F. Hoffman serves as senior vice president, information technology, and chief accounting officer at Century Aluminum. His Form 4 filing reflects personal holdings and transactions in the company’s common stock, including unvested restricted stock units and 401(k) plan shares.

How were the transactions in Robert F. Hoffman's CENX Form 4 executed?

The 10,000-share transaction was a sale in the open market. The filing notes it was executed through multiple trades at prices between $56.15 and $56.50, and the executive undertook to provide full trade details to regulators or shareholders upon request.