Glencore International Ag - Nov 10, 2025 Form 4 Insider Report for CENTURY ALUMINUM CO (CENX)

Role
10%+ Owner
Signature
GLENCORE INTERNATIONAL AG By: /s/ John Burton Name: John Burton Title: Attorney-in-Fact
Stock symbol
CENX
Transactions as of
Nov 10, 2025
Transactions value $
-$272,250,000
Form type
4
Date filed
11/13/2025, 05:59 PM
Previous filing
Oct 2, 2025
SEC
View on sec.gov

Reporting Owners (3)

Name Relationship Address Signature Signature date CIK
GLENCORE INTERNATIONAL AG 10%+ Owner BAARERMATTSTRASSE 3, P.O. BOX 1363, BAAR, SWITZERLAND GLENCORE INTERNATIONAL AG By: /s/ John Burton Name: John Burton Title: Attorney-in-Fact 2025-11-13 0001032383
Glencore AG 10%+ Owner BAARERMATTSTRASSE 3, P.O. BOX 1363, BAAR, SWITZERLAND GLENCORE AG By: /s/ John Burton Name: John Burton Title: Attorney-in-Fact 2025-11-13 0001449539
Glencore plc 10%+ Owner BAARERMATTSTRASSE 3, P.O. BOX 1363, BAAR, SWITZERLAND GLENCORE PLC By: /s/ John Burton Name: John Burton Title: Company Secretary 2025-11-13 0001521365

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CENX Common Stock Sale -$272M -9M -32.73% $30.25 18.5M Nov 10, 2025 Direct
transaction CENX Common Stock Conversion of derivative security +4.95M +39.41% 17.5M Nov 10, 2025 See Footnote F1, F2, F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction CENX Series A Convertible Preferred Stock Conversion of derivative security -49.5K -100% 0 Nov 10, 2025 Common Stock 4.95M See Footnote F1, F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents shares of Common Stock acquired upon the automatic conversion of 49,485.91 shares of Series A Convertible Preferred Stock upon the consummation of the transaction reported in Line 1 of Table 1.
F2 Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock was acquired on July 8, 2008 and has no expiration date.
F3 The shares of Common Stock reported in Line 2 of Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and may be deemed to be indirectly beneficially owned by Glencore International AG. The Common Stock reported on Line 1 of Table I is held directly by Glencore International AG. Glencore International AG is wholly-owned by Glencore plc, which may be deemed an indirect beneficial owner of the securities held by Glencore AG and Glencore International AG.

Remarks:

Exhibit List: Exhibit 24.1 and Exhibit 24.2.