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[Form 4] CENTURY ALUMINUM CO Insider Trading Activity

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Century Aluminum director Andrew G. Michelmore reported routine equity compensation activity involving company stock. He received a grant of 2,172 shares of Common Stock as an annual award of restricted stock units, with all RSUs vesting on the grant date. To satisfy associated tax obligations upon vesting, 652 shares were withheld by the company at a price of $54.55 per share. After these transactions, Michelmore directly holds 91,261 shares of Century Aluminum common stock.

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Insider Michelmore Andrew G
Role null
Type Security Shares Price Value
Grant/Award Common Stock 2,172 $0.00 --
Tax Withholding Common Stock 652 $54.55 $36K
Holdings After Transaction: Common Stock — 91,261 shares (Direct, null)
Footnotes (1)
  1. Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant. Represents shares withheld by the Issuer upon vesting of the RSUs to satisfy tax obligations.
RSU award size 2,172 shares Annual restricted stock unit grant, all vested on grant date
Shares withheld for taxes 652 shares Withheld upon RSU vesting to satisfy tax obligations
Tax-withholding price $54.55 per share Valuation used for 652-share tax-withholding disposition
Shares held after transactions 91,261 shares Common Stock directly owned by Michelmore after Form 4 events
restricted stock units ("RSUs") financial
"Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant."
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.
vested on the date of grant financial
"Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant."
tax obligations financial
"Represents shares withheld by the Issuer upon vesting of the RSUs to satisfy tax obligations."
tax-withholding disposition financial
"transaction_action: tax-withholding disposition for 652 shares at $54.55 per share."
A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Michelmore Andrew G
(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)
XDirector10% 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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/15/2026A2,172(1)A$091,261D
Common Stock06/15/2026F652(2)D$54.5590,609D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents annual grant of restricted stock units ("RSUs"), all of which vested on the date of grant.
2. Represents shares withheld by the Issuer upon vesting of the RSUs to satisfy tax obligations.
Remarks:
/s/ John DeZee, as attorney in fact for Andrew Michelmore06/17/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR