Form 4: Trpkovski Peter A reports disposition transactions in CENX

Rhea-AI Filing Summary

Trpkovski Peter A reported disposition transactions in a Form 4 filing for CENX. The filing lists transactions totaling 4,240 shares at a weighted average price of $54.36 per share. Following the reported transactions, holdings were 80,864 shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Trpkovski Peter A

Role EVP, CFO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	4,240	$54.36	$230K

Holdings After Transaction: Common Stock — 80,864 shares (Direct)

Footnotes (1)

1. Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of RSUs previously granted to the Reporting Person on February 9, 2023. 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

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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^*

Trpkovski Peter A

(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)
	EVP, CFO

3. Date of Earliest Transaction (Month/Day/Year)
02/09/2026

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	02/09/2026		F		4,240(1)	D	$54.36	80,864(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. Shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of RSUs previously granted to the Reporting Person on February 9, 2023.

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	02/11/2026
	** 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 EVP, CFO Peter Trpkovski report?

Peter A. Trpkovski reported a tax-withholding disposition of Century common stock. On February 9, 2026, the issuer withheld 4,240 shares to satisfy tax obligations arising from the vesting of restricted stock units previously granted to him on February 9, 2023.

How many CENX shares were involved in the February 9, 2026 Form 4?

The Form 4 shows 4,240 shares of Century common stock were withheld. These shares were retained by the issuer at a reported price of $54.36 per share to cover Peter A. Trpkovski’s tax liability from vesting restricted stock units.

Was the CENX insider transaction an open-market sale or tax withholding?

The transaction was a tax-withholding disposition, not an open-market sale. The issuer withheld 4,240 shares of common stock to pay tax obligations tied to RSUs vesting for EVP, CFO Peter A. Trpkovski, as described in the filing’s explanatory footnote.

How many CENX shares does Peter Trpkovski own after this transaction?

After the reported transaction, Peter A. Trpkovski beneficially owned 80,864 shares of Century common stock. The filing explains this amount includes unvested restricted stock units granted to him under the issuer’s long-term incentive plans, reflecting both vested holdings and ongoing equity awards.

What do the footnotes in the CENX Form 4 filing explain about the RSUs?

The footnotes state that shares were withheld by the issuer to satisfy tax obligations from RSU vesting. They also clarify that the post-transaction beneficial ownership figure includes unvested RSUs granted under Century’s long-term incentive plans to Peter A. Trpkovski.

What is Peter Trpkovski’s role at CENX mentioned in the Form 4?

The Form 4 identifies Peter A. Trpkovski as an officer of Century, serving as EVP, CFO. This means he is the company’s executive vice president and chief financial officer, and the filing reflects his equity-related tax-withholding transaction.