Century Aluminum director receives 2,172 RSU award

Bush Jennifer Mary reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Bush Jennifer Mary reported acquisition or exercise transactions in this Form 4 filing.

Century Aluminum director Jennifer Mary Bush received an equity award in the form of restricted stock units. She was granted 2,172 shares of common stock on a grant/award basis at no cash price, as part of her annual compensation.

The RSUs vest in full on the earlier of the 12-month anniversary of the grant date, the company’s next regular annual meeting of stockholders, or certain other events described in the award terms. After this grant, she holds 49,044 shares of common stock directly, including shares issuable from vested RSUs whose settlement she has elected to defer.

Insider Trade Summary

Grant/Award: 2,172 shares

Grant/Award 1 txn

Insider Bush Jennifer Mary

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,172	$0.00	$0.00

Holdings After Transaction: Common Stock — 49,044 shares (Direct)

Footnotes (2)

1. F1. Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in accordance with the terms of the award.
2. F2. Includes shares of common stock issuable pursuant to vested RSUs, the settlement of which have been deferred pursuant to an annual deferral election previously made by the Reporting Person.

Key Figures

RSUs granted: 2,172 shares Shares after transaction: 49,044 shares Grant price: $0.0000 per share +1 more

4 metrics

RSUs granted 2,172 shares Annual equity award of common stock RSUs

Shares after transaction 49,044 shares Total direct holdings after RSU grant, including deferred RSUs

Grant price $0.0000 per share Equity award, no cash exercise price

Transaction code A Grant, award, or other acquisition of common stock

Key Terms

restricted stock units ("RSUs"), annual grant, deferral election, annual meeting of stockholders

4 terms

restricted stock units ("RSUs") financial

"Represents annual grant of restricted stock units ("RSUs"), all of which vest in full..."

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

annual grant financial

"Represents annual grant of restricted stock units ("RSUs"), all of which vest in full..."

deferral election financial

"settlement of which have been deferred pursuant to an annual deferral election previously made..."

annual meeting of stockholders financial

"vest in full on the earlier of (i) the 12-month anniversary... (ii) the date of the Issuer's next regular annual meeting of stockholders..."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Century Aluminum (CENX) disclose for Jennifer Mary Bush?

Century Aluminum reported that director Jennifer Mary Bush received an annual grant of 2,172 restricted stock units, representing common stock awarded as compensation. The grant carries no cash exercise price and is structured as equity-based director pay rather than an open-market share purchase or sale.

How many Century Aluminum (CENX) shares does Jennifer Mary Bush hold after this Form 4?

After the reported grant, Jennifer Mary Bush holds 49,044 Century Aluminum common shares directly. This figure includes stock underlying vested RSUs whose settlement she elected to defer, meaning some shares are not yet delivered but are already earned under prior equity awards.

What are the vesting terms of the RSUs granted to the Century Aluminum (CENX) director?

The RSUs granted to the director vest in full on the earlier of the 12-month anniversary of the grant date, the next regular annual meeting of stockholders, or specified events in the award terms. These conditions define when the award converts into deliverable common shares.

Was the Century Aluminum (CENX) insider transaction a market purchase or sale?

The transaction was not a market purchase or sale. It was reported with code “A” as a grant or award acquisition, reflecting equity compensation in restricted stock units with a per-share price of $0.0000, rather than an open-market trade for cash.

What does the deferral election mentioned in the Century Aluminum (CENX) filing mean?

The deferral election means the director chose to delay settlement of some vested RSUs into actual common shares. Those deferred RSUs are already vested and counted in her reported holdings, but delivery of the underlying shares occurs later according to her deferral arrangement.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/17/2026 - 04:38 PM Learn about SEC filing dates

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^*

Bush Jennifer Mary

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026

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	06/15/2026		A		2,172(1)	A	$0	49,044(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. Represents annual grant of restricted stock units ("RSUs"), all of which vest in full on the earlier of (i) the 12-month anniversary of the grant date, (ii) the date of the Issuer's next regular annual meeting of stockholders, or (iii) the occurrence of certain other events in accordance with the terms of the award.

2. Includes shares of common stock issuable pursuant to vested RSUs, the settlement of which have been deferred pursuant to an annual deferral election previously made by the Reporting Person.

Remarks:

	/s/ John DeZee, as attorney in fact for Jennifer Bush	06/17/2026
	** 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.
* Form 4: SEC 1474 (03-26)