# EDGAR Filing Document

**Accession Number:** 0000949157
**File Stem:** 0001552781-26-000270
**Filing Date:** 2026-4
**Character Count:** 5185
**Document Hash:** 9e266703ed42e590835aac0ad4721c70
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001552781-26-000270.hdr.sgml**: 20260424

**ACCESSION NUMBER**: 0001552781-26-000270

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260424

**DATE AS OF CHANGE**: 20260424

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CENTURY ALUMINUM CO
- **CENTRAL INDEX KEY:** 0000949157
- **STANDARD INDUSTRIAL CLASSIFICATION:** PRIMARY PRODUCTION OF ALUMINUM [3334]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 133070826
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34474
- **FILM NUMBER:** 26890666

**BUSINESS ADDRESS:**
- **STREET 1:** 1 SOUTH WACKER DRIVE
- **STREET 2:** SUITE 1000
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3126963101

**MAIL ADDRESS:**
- **STREET 1:** 1 SOUTH WACKER DRIVE
- **STREET 2:** SUITE 1000
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

**UNITED STATES** **<br> SECURITIES AND EXCHANGE COMMISSION**<br> Washington, D.C. 20549

**SCHEDULE 14A**

**Proxy Statement Pursuant to Section 14(a) of the Securities**

**Exchange Act of 1934 (Amendment No.)**

☒ Filed by the Registrant ☐ Filed by a Party other than the Registrant

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| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;**Check the appropriate box:** | &nbsp;&nbsp;&nbsp;**Check the appropriate box:** |
| &nbsp;&nbsp;&nbsp;☐ | &nbsp;&nbsp;&nbsp;Preliminary Proxy Statement |
| &nbsp;&nbsp;&nbsp;☐ | &nbsp;&nbsp;&nbsp;CONFIDENTIAL, FOR USE OF THE COMMISSION ONLY (AS PERMITTED BY RULE 14a-6(e)(2)) |
| &nbsp;&nbsp;&nbsp;☐ | &nbsp;&nbsp;&nbsp;Definitive Proxy Statement |
| &nbsp;&nbsp;&nbsp;☒ | &nbsp;&nbsp;&nbsp;Definitive Additional Materials |
| &nbsp;&nbsp;&nbsp;☐ | &nbsp;&nbsp;&nbsp;Soliciting Material Under Rule 14a-12 |

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**CENTURY ALUMINUM COMPANY**

*(Name of Registrant as Specified In Its Charter)*

 

 <br> *(Name of Person(s) Filing Proxy Statement, if Other than the Registrant)*

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| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;**Payment of Filing Fee (Check the appropriate box):** | &nbsp;&nbsp;&nbsp;**Payment of Filing Fee (Check the appropriate box):** |
| &nbsp;&nbsp;&nbsp;☒ | &nbsp;&nbsp;&nbsp;**No fee required.** |
| &nbsp;&nbsp;&nbsp;☐ | &nbsp;&nbsp;&nbsp;**Fee paid previously with preliminary materials.** |
| &nbsp;&nbsp;&nbsp;☐ | &nbsp;&nbsp;&nbsp;**Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.** |

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![](cenx_naa-card1.jpg)

Your Vote Counts! Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V95510-P49306 \*Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. CENTURY ALUMINUM COMPANY 1 SOUTH WACKER DRIVE SUITE 1000 CHICAGO, IL 60606 CENTURY ALUMINUM COMPANY You invested in CENTURY ALUMINUM COMPANY and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on June 15, 2026 at 8:30 a.m., Central Time. Get informed before you vote View Century's 2026 Proxy Statement and Annual Report on Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to June 1, 2026. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote in Person at the Meeting\* June 15, 2026 8:30 a.m., Central Time 1 South Wacker Drive Mezzanine Chicago, Illinois 60606 2026 Annual Meeting Vote by June 14, 2026 11:59 p.m. ET. For shares held in a Plan, vote by June 10, 2026 11:59 p.m. ET.

![](cenx_naa-card2.jpg)

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings". V95511-P49306 Voting Items Board Recommends THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. Election of Directors For Nominees: 01) Jarl Berntzen 02) Jennifer Bush 03) Jesse Gary 04) Errol Glasser 05) Wilhelm van Jaarsveld 06) Andrew Michelmore 07) Tamla Olivier 2. Proposal to ratify the appointment of Deloitte & Touche LLP as the Company's independent registered accounting firm for the fiscal year ending December 31, 2026. For 3. Proposal to approve, on an advisory basis, the compensation of the named executive officers. For NOTE: By execution of this Proxy Card, the undersigned hereby authorizes the proxies to vote, in their discretion, on any other business that may properly be brought before the meeting or any postponement thereof.