Century Aluminum (NASDAQ: CENX) CFO sells 16,739 common shares

Rhea-AI Filing Summary

Century Aluminum executive vice president and CFO Peter A. Trpkovski sold 16,739 shares of common stock in an open-market transaction on March 25, 2026 at a weighted average price of $50.51 per share, with trades ranging from $50.50 to $50.64.

After this sale, he directly holds 64,125 shares, which include unvested restricted stock units granted under the company’s long-term incentive plans, so this represents a reduction rather than an exit of his equity position.

Insider Trade Summary

Net Seller: 16,739 shares ($845,487)

Net Sell 1 txn

Insider Trpkovski Peter A

Role EVP, CFO

Sold 16,739 shs ($845K)

Type	Security	Shares	Price	Value
Sale	Common Stock	16,739	$50.51	$845K

Holdings After Transaction: Common Stock — 64,125 shares (Direct)

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 $50.50 to $50.64, 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.

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^*

Trpkovski Peter A

(Last) (First) (Middle)

C/O CENTURY ALUMINUM COMPANY

1 S. WACKER DRIVE, SUITE 1000

(Street)

CHICAGO ILLINOIS 60606

(City) (State) (Zip)

UNITED STATES

(Country)

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, CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	03/25/2026		S		16,739	D	$50.51(1)	64,125(2)	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 price reported above reflects the weighted average sale price for the shares which were sold in multiple transactions at prices ranging from $50.50 to $50.64, 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.

Remarks:

	/s/ Paul Sharobeem, as attorney in fact for Peter A. Trpkovski	03/27/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Century Aluminum (CENX) report for its CFO?

Century Aluminum’s EVP and CFO Peter A. Trpkovski sold 16,739 common shares in an open-market transaction. The sale occurred at a weighted average price of $50.51, with individual trades executed between $50.50 and $50.64 per share.

At what price did the Century Aluminum (CENX) CFO sell his shares?

The CFO’s sale was executed at a weighted average price of $50.51 per share. According to disclosures, the individual transactions took place in a price range from $50.50 to $50.64 per share in the open market.

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

Following the reported transaction, the CFO directly holds 64,125 Century Aluminum common shares. This figure includes unvested restricted stock units granted under the company’s long-term incentive plans, reflecting his remaining equity stake after the open-market sale.

Was the Century Aluminum (CENX) CFO’s sale a one-time open-market transaction?

Yes, the filing describes a single open-market sale of 16,739 common shares. The trades were executed on March 25, 2026, across multiple prices within a narrow band between $50.50 and $50.64 per share.

Does the Century Aluminum (CENX) CFO still have unvested RSUs after the sale?

Yes, his post-transaction holdings of 64,125 shares include unvested restricted stock units. These RSUs were granted under Century Aluminum’s long-term incentive plans and remain part of his reported direct ownership position after the sale.