State Street Corporation (CENX) discloses 5.6% beneficial stake in Century common

Rhea-AI Filing Summary

State Street Corporation reported beneficial ownership of 5,542,720 shares of CENTURY common stock (CUSIP 156431108) as of June 30, 2026, representing 5.6% of the class.

All voting power and dispositive power are held on a shared basis through investment adviser subsidiaries, including SSGA Funds Management, Inc., State Street Global Advisors Europe Limited, State Street Global Advisors Limited, State Street Global Advisors Trust Company, and State Street Global Advisors, Ltd. State Street reports no sole voting or dispositive power and indicates that no group filing or ownership on behalf of another person over 5% applies.

Key Figures

Shares beneficially owned: 5,542,720 shares Percent of class: 5.6% Shared voting power: 5,372,092 shares +3 more

6 metrics

Shares beneficially owned 5,542,720 shares Century common stock beneficially owned by State Street Corporation as of June 30, 2026

Percent of class 5.6% Percentage of Century common stock class beneficially owned by State Street Corporation

Shared voting power 5,372,092 shares Shares of Century common stock over which State Street has shared voting power

Sole voting power 0 shares Century common shares over which State Street has sole voting power

Shared dispositive power 5,542,720 shares Century common shares over which State Street has shared power to dispose or direct disposition

Sole dispositive power 0 shares Century common shares over which State Street has sole dispositive power

Key Terms

beneficially owned, shared voting power, shared dispositive power, investment company, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 5542720.00"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"Shared Voting Power 5,372,092.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 5,542,720.00"

investment company financial

"shareholders of an investment company registered under the Investment Company Act of 1940"

parent holding company financial

"subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company"

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Available on EDGAR 08/07/2026 - 08:58 AM Accepted by SEC EDGAR 08/07/2026 - 08:57 AM Learn about SEC filing dates

FAQ

What ownership stake in CENX does State Street Corporation report on this Schedule 13G?

State Street Corporation reports beneficial ownership of 5,542,720 shares of CENTURY common stock, representing 5.6% of the outstanding class as of June 30, 2026, with all authority held on a shared basis.

How much voting power in CENX stock does State Street Corporation have?

State Street reports 0 shares with sole voting power and 5,372,092 shares with shared voting power. This means voting decisions are made jointly through affiliated investment adviser entities rather than by State Street alone.

What is the difference between voting and dispositive power in this CENX Schedule 13G?

Voting power concerns how shares are voted, while dispositive power covers the ability to sell or direct the sale. State Street shows shared voting over 5,372,092 shares and shared dispositive power over 5,542,720 shares of CENTURY stock.

Which State Street subsidiaries hold the CENX shares reported in this filing?

The filing attributes the holdings to investment adviser subsidiaries including SSGA Funds Management, Inc., State Street Global Advisors Europe Limited, State Street Global Advisors Limited, State Street Global Advisors Trust Company, and State Street Global Advisors, Ltd., each classified as an investment adviser (IA).

Does State Street report any sole dispositive power over CENX shares?

No. State Street reports 0 shares with sole dispositive power and 5,542,720 shares with shared dispositive power. This indicates decisions to sell or direct the sale are made jointly through its investment adviser subsidiaries.

Is there a filing group or other 5% holder identified in the CENX Schedule 13G?

The Schedule 13G notes no applicable group and no other person identified as having rights to dividends or sale proceeds over 5% of the class. Group-related and more-than-5%-on-behalf-of-another disclosures are both marked not applicable.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

CENTURY ALUMINUM CO

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

156431108

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 156431108

1

Names of Reporting Persons

STATE STREET CORPORATION

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 5,372,092.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 5,542,720.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,542,720.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.6 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CENTURY ALUMINUM CO
(b)	Address of issuer's principal executive offices: 1 SOUTH WACKER DRIVE SUITE 1000, CHICAGO, ILLINOIS, 60606
Item 2.
(a)	Name of person filing: STATE STREET CORPORATION;
(b)	Address or principal business office or, if none, residence: ONE CONGRESS STREET, SUITE 1, BOSTON MA 02114, UNITED STATES
(c)	Citizenship: MA
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP Number(s): 156431108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 5542720.00
(b)	Percent of class: 5.6 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 5,372,092
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 5,542,720
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. NOT APPLICABLE
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. SSGA FUNDS MANAGEMENT, INC. (IA);STATE STREET GLOBAL ADVISORS EUROPE LIMITED (IA);STATE STREET GLOBAL ADVISORS LIMITED (IA);STATE STREET GLOBAL ADVISORS TRUST COMPANY (IA);STATE STREET GLOBAL ADVISORS, LTD. (IA);
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. NOT APPLICABLE
Item 9.	Notice of Dissolution of Group.
	Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5. NOT APPLICABLE

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

STATE STREET CORPORATION

Signature:	ELIZABETH SCHAEFER
Name/Title:	SENIOR VICE PRESIDENT, CHIEF ACCOUNTING OFFICER
Date:	08/07/2026