Dear Fellow Shareholders,

This past year presented Century with many new opportunities and challenges, both strategic and commercial, and your company emerged stronger for it. While aluminum prices fell during the year as higher global interest rates impacted commercial and industrial demand, energy markets returned to normal levels and other input costs began to abate. Century completed its long-held ambition to integrate our bauxite and alumina supply through the Jamalco acquisition in May, and received a significant vote of confidence and long- term support from Congress and the Biden administration in the form of the Section 45X production tax credits. All told, Century enters 2024 well positioned to deliver on our long-term goal of providing innovative aluminum products to our customers through reliable supply chains.

We are particularly proud of the progress we made in 2023 on our most important responsibility, which is to provide a safe and sustainable workplace for our people and the communities in which we operate. Safety performance across our plants improved in 2023 and our teams made significant progress adopting new systems that we hope will drive additional improvements in 2024. We were also excited to publish our new Sustainability Vision in 2023 and have had excellent discussions with many of you reflecting these goals.

On a macro level, global aluminum supply and demand was broadly balanced last year. New supply continued to be limited due to China's adherence to its capacity cap and additional Western smelter curtailments. Broad trends in lightweighting, electrification, and renewable energy drove strong Chinese demand growth in 2023, while Western demand remained muted given continued customer destocking and rising interest rates. We expect demand growth to accelerate in 2024, both in China and the West, as global monetary policy is relaxed.

Our team made considerable progress on several long-term initiatives last year, including our strategic acquisition of a 55% stake in the Jamalco alumina refinery and bauxite mines located in Clarendon, Jamaica. We are very excited to add Jamalco to the Century team and secure a captive supply of high-quality alumina and bauxite for our smelters, resulting in a more balanced operational footprint and meaningful opportunity for long-term value creation for all our stakeholders. We also concluded a new three-year power contract for Mt. Holly that should enable us to continue to invest in this excellent smelter and its employees for years to come. At Sebree, we reached a new, five-year collective bargaining agreement with the United Steelworkers enhancing opportunities for our employees while simultaneously strengthening Sebree's position in the highly competitive aluminum market. In Iceland, we neared completion of our new 150,000 tonne low-carbon billet casthouse, which will begin selling Natur-AlTM billet into the European market in 2024.

Finally, we are grateful to Congress and the Biden Administration for recognizing the vital importance of a strong domestic primary aluminum industry to U.S. national security through the production tax credits of Section 45X of the Inflation Reduction Act. In December, new proposed regulations issued by the Treasury Department confirmed the application of Section 45X to U.S. production of primary aluminum and clarified eligible costs that qualify for the 10% tax credit, resulting in a full-year 2023 adjusted EBITDA benefit of $59 million for Century. Importantly, the language of the IRA and the proposed Treasury regulations made clear that the production tax credit for critical minerals like primary aluminum does not phase out. Overall, the production tax credits provided by Section 45X will help to underpin further investment in our industry, strengthen domestic supply chains and ensure that the U.S. industry will be able to meet U.S. needs for this vital metal. Century is proud to do its part towards accelerating the green energy transition and positioning the U.S. as a global leader in advanced manufacturing.

We want to thank our entire Century team for their hard work and commitment to Century. We remain focused on delivering long-term value to our shareholders and look forward to continued success in the years ahead.

Andrew Michelmore

Jesse Gary

Chairman of the Board

President and Chief Executive Officer

Century Aluminum Company

1 South Wacker Drive

Suite 1000

Chicago, Illinois 60606

Notice of Annual Meeting

of Stockholders

To the Stockholders of Century Aluminum Company:

We cordially invite you to attend our 2024 Annual Meeting of Stockholders. The meeting this year will be held on Monday, June 3, 2024, at 8:30 a.m., Central Time, at Hyatt Place Chicago/Downtown - The Loop, 28 North Franklin Street, Chicago, Illinois 60606. At the meeting, we will hold votes to:

  • Elect as Directors, the seven nominees named in this Proxy Statement, each for a term of one year
  • Ratify Deloitte & Touche LLP as our independent registered public accounting firm for 2024
  • Approve by non-binding advisory vote, the compensation of our named executive officers
  • Address any other business that properly comes before the meeting

All holders of our common stock as of the close of business on April 8, 2024, are entitled to vote at the meeting. You can also vote before the meeting - by telephone, online or by mail. Your vote is important. Whether or not you plan to attend the meeting, please vote as soon as possible to ensure that your shares are represented and voted at the meeting. Instructions on how to vote are found in the section "How do I vote?" on page 67.

Chicago, Illinois

By Order of the Board of Directors,

April 18, 2024

John DeZee

Executive Vice President, General Counsel and Corporate Secretary

Important Notice Regarding the Availability of Proxy Materials for the 2024 Annual Meeting of Stockholders to be held on Monday, June 3, 2024: Our Proxy Statement and 2023 Annual Report are available free of charge on our website at www.centuryaluminum.com or www.proxyvote.com.

Cautionary Statement Regarding Forward-Looking Statements

This proxy statement contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended (the "Securities Act") and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Forward-looking statements are statements about future events and are based on our current expectations. These forward-looking statements may be identified by the words "believe," "expect," "hope," "target," "anticipate," "intend," "plan," "seek," "estimate," "potential," "project," "scheduled," "forecast" or words of similar meaning, or future or conditional verbs such as "will," "would," "should," "could," "might," or "may." Any statement that reflects expectations, assumptions or projections about the future, other than statements of historical fact, is a forward-looking statement. Where we express an expectation or belief as to future events or results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. However, our forward-looking statements are based on current expectations and assumptions that are subject to risks and uncertainties which may cause actual results to differ materially from future results expressed, projected or implied by those forward-looking statements. Important factors that could cause actual results and events to differ from those described in such forward-looking statements can be found in the risk factors and forward-looking statements cautionary language contained in our Annual Report on Form 10-K, quarterly reports on Form 10-Q and in other filings made with the Securities and Exchange Commission (the "SEC"). Although we have attempted to identify those material factors that could cause actual results or events to differ from those described in such forward-looking statements, there may be other factors that could cause actual results or events to differ from those anticipated, estimated or intended. Many of these factors are beyond our ability to control or predict. Given these uncertainties, investors are cautioned not to place undue reliance on our forward-looking statements. We undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events, or otherwise.

Incorporation by Reference

Neither the Compensation Committee Report nor the Audit Committee Report shall be deemed soliciting material or filed with the SEC and neither of them shall be deemed incorporated by reference into any prior or future filings made by us under the Securities Act or the Exchange Act, except to the extent that we specifically incorporate such information by reference. In addition, this document includes references to our website as well as to our Sustainability Report; however, the information contained on our website, or any other website, or in our Sustainability Report is not incorporated by reference into or otherwise made a part of this proxy statement.

Table of

Contents

Page

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

Cautionary Statement Regarding Forward-Looking Statements

Incorporation by Reference

PROXY STATEMENT SUMMARY

Notice of Availability of Proxy Materials

1

2024 Annual Meeting Details

1

Voting Proposals and Board Vote Recommendations

2

Ways to Vote

2

Board Nominees

2

2023 Performance Highlights

3

Corporate Governance Snapshot

3

2023 Executive Compensation Summary

4

BOARD OF DIRECTORS AND CORPORATE GOVERNANCE

Proposal No. 1 Election of Directors

6

2024 Director Nominees

7

Board Composition, Skills and Diversity

11

Corporate Governance

13

Board Leadership and Independent Chairman

13

Director Independence

13

Board Committees and Meeting Attendance

13

Audit Committee

14

Compensation Committee

15

Governance and Nominating Committee

16

Health, Safety and Sustainability Committee

16

Board Oversight of Risk Management

17

Corporate Governance Guidelines and Code of Ethics

18

Related Party Transaction Policy

18

-i-

Page

Health, Safety and Sustainability

18

2023 Shareholder Engagement

19

2023 Non-Employee Director Compensation

19

Non-Employee Director Stock Ownership Guidelines

21

Stockholder Communications with the Board of Directors

21

INDEPENDENT AUDITORS

Proposal No. 2 Ratification of the Appointment of Independent Registered Public Accounting Firm

23

Summary of Fees Paid to Independent Auditor

23

Audit Committee Report

25

EXECUTIVE COMPENSATION

Proposal No. 3 Advisory Vote to Approve the Compensation of Our Named Executive Officers

27

Compensation Discussion and Analysis

28

Our Philosophy on Executive Compensation and Overview of 2022 NEO Compensation

29

Compensation Program Structure

30

Consideration of "Say-on-Pay" Results

31

Our Process for Executive Compensation

31

The Compensation Committee

31

Compensation Considerations

32

Benchmarking Executive Compensation

32

Role of the Chief Executive Officer

33

Role of Compensation Committee Consultants

33

Components of Executive Compensation

34

Base Salary

34

Annual Incentive Program

35

Long-Term Incentive Plan

38

CEO Transition Payments

41

Retirement Benefits

41

Severance and Change in Control Benefits

42

Employment Agreements

42

Other Compensation Considerations and Policies

43

Stock Ownership Guidelines

43

Company Policy Prohibiting "Short Sales," Pledging and Hedging of Company Stock

43

Incentive Compensation Recoupment Policy

43

-ii-

Page

Timing of Equity Awards

44

Income Tax Consequences

44

Compensation Risk Assessment

44

Compensation Committee Report

45

Compensation Tables

46

Summary Compensation Table

46

Grants of Plan-Based Awards

47

Outstanding Equity Awards at Fiscal Year-end

48

Option Exercises and Stock Vested

49

Post-Employment Compensation

49

Potential Payments and Benefits upon Termination or Change-in-Control

50

CEO Pay Ratio Disclosure

55

Pay vs. Performance

56

OTHER IMPORTANT MATTERS

Stock Ownership of Certain Beneficial Owners

61

Stock Ownership of Directors and Executive Officers

62

Delinquent Section 16(a) Reports

62

Transactions with Related Parties in 2023

63

Matters Raised at the 2024 Annual Meeting Not Included in This Statement

64

Stockholder Proposals and Director Nominations for the 2025 Annual Meeting

64

Non-GAAP Financial Measures

65

Questions & Answers

66

-iii-

For the 2024 Annual Meeting

Proxy Statement

Summary

Our Board is soliciting proxies for the 2024 Annual Meeting of Stockholders (the "2024 Annual Meeting") of Century Aluminum Company ("Century" or the "Company"). This proxy statement contains information about the items you will vote on at the 2024 Annual Meeting. Further information and instructions on how to vote online, or in the alternative, request a paper copy of these proxy materials and a proxy card, will be as set forth in the Notice of Internet Availability of Proxy Materials ("Notice") as described below.

Notice of Availability of Proxy Materials

We are pleased to take advantage of the Securities and Exchange Commission ("SEC"') rules that permit public companies to furnish proxy materials to stockholders over the Internet. On or about April 19, 2024, we will begin mailing the Notice and making available to stockholders these proxy materials and the proxy card. The Notice contains instructions on how to vote online, or in the alternative, request a paper copy of the proxy materials and a proxy card. By furnishing a Notice and access to our proxy materials by the Internet, we are lowering the costs and reducing the environmental impact of the 2024 Annual Meeting. If you received a Notice by mail, you will not receive a paper copy of the proxy materials unless you request such materials by following the instructions contained on the Notice. Your vote is important no matter the extent of your holdings.

This summary highlights information contained elsewhere in this proxy statement. This summary does not contain all of the information that you should consider, and you should read the entire proxy statement carefully before voting. For more complete information regarding Century Aluminum Company's 2023 performance, please review our 2023 Annual Report filed on Form 10-K with the Securities and Exchange Commission and any amendments thereto. References to "Century," "the Company", "we", "us" or "our" refer to Century Aluminum Company.

2024 Annual Meeting Details

Time and Date:

Place:

Voting:

8:30 a.m. Central Time,

Hyatt Place Chicago/Downtown -

Only holders of our common

Monday, June 3, 2024

The Loop, 28 North Franklin

stock as of the record date (April

Street, Chicago, Illinois 60606

8, 2024) are entitled to vote.

Admission:

An admission ticket is required to enter Century's 2024 Annual Meeting of Stockholders. See instructions on page 66.

Century Aluminum | 2024 Proxy Statement

1

Proxy Summary

Table of Contents

Voting Proposals and Board Vote Recommendations

Voting Proposals

Board Recommendation Page Reference

  • Item 1 - Election of the Seven Directors Named in this Proxy Statement to Serve a One- Year Term
  • Item 2 - Ratification of the Appointment of Deloitte & Touche LLP as the Company's Independent Registered Public Accounting Firm for 2024
  • Item 3 - Advisory Vote to Approve the Compensation of our Named Executive Officers

FOR each

6

Director Nominee

FOR

23

FOR

27

Ways to Vote

Internet:

Mobile Device:

Mail:

In Person:

The website for voting prior

If you are located in the United

To vote by mail, mark, sign and

If you are the stockholder

to the 2024 Annual Meeting

States or Canada, you can vote

date your proxy card and return it

of record, or hold a valid proxy

ishttp://www.ProxyVote.com

your shares by calling

in the postage-paid envelope

from a stockholder of record, you

1-800-690-6903.

provided.

may vote by attending the 2024

Annual Meeting in person.

Board Nominees

The following table provides summary information about each director nominee standing for election at the 2024 Annual Meeting, the Board Committees on which such director currently serves, if any, and the number of other public company boards they serve on.

Director

Other Public

Name

Age

Since

Independent

AC

CC

G&NC

HSSC

Company Boards

Andrew Michelmore (Chairman)

71

2018

Yes

Jarl Berntzen

57

2006

Yes

Jennifer Bush

50

2021

Yes

Jesse Gary

44

2021

No

Errol Glasser

70

2014

Yes

-

-

Cummins India, Ltd.

-

-

-

-

Regency Affiliates,

Inc.

Wilhelm van Jaarsveld

39

2017

No

-

-

-

-

-

Tamla Olivier

51

2023

Yes

-

AC Audit Committee CC

Compensation Committee G&NC

Governance & Nominating Committee

HSSC Health, Safety & Sustainability Committee

Committee Chair

Committee Member

2

Century Aluminum | 2024 Proxy Statement

Table of Contents

Proxy Summary

2023 Performance Highlights

$49 million

$105 million

$120 million

$312 million

Reduced total debt by $49 million

Net cash provided by operating

Produced $120 million of

Strong year-end liquidity of $312

activities

Adjusted EBITDA*

million

* Adjusted EBITDA is a non-GAAP measure, and a reconciliation to the most directly comparable GAAP measure is included on page 65.

While 2023 presented a complex macro environment, the global aluminum market continues to benefit from positive, long-term trends towards lightweighting, electrification, and renewable energy. At the same time, supply remains constrained, especially in our core markets in the US and Europe, where our growing value-added product portfolio will allow us to meet the increasing need for these products. We are well positioned and excited to execute on these opportunities in 2024.

The following are key performance highlights for 2023:

  • Reduced workplace injuries by 20% compared to prior year levels.
  • Completed the strategic acquisition of a 55% stake in the Jamalco alumina refinery.
  • Reached agreement on a new, three-year power contract for our Mt. Holly smelter.
  • Agreed to a new, five-year collective bargaining agreement with the United Steelworkers at our Sebree smelter.
  • Continued progress on our low-carbon billet casthouse at Grundartangi, which is expected to begin production in 2024.

Corporate Governance Snapshot

Century is committed to strong corporate governance practices, which we believe promote long-term value creation for our stockholders by strengthening Board and management accountability. Our key corporate governance practices are listed below and described in more detail below under "Corporate Governance."

  • Independent Board Chairman
  • Regular meetings of the Independent Directors
  • Fully independent Audit, Compensation and Governance & Nominating Committees
  • 97.8% director attendance at Board meetings in 2023 by all directors
  • 100% director attendance at Committee meetings in 2023
  • Commitment to and emphasis on board diversity, including through the inclusion of the "Rooney Rule" in nominating process
  • Annual elections for all directors
  • Annual Board and Committee self-evaluations
  • Proactive shareholder outreach with regular board updates
  • Stock ownership guidelines that apply to all executive officers and directors
  • Policies prohibiting short sales, hedging, margin accounts and pledging of Century stock by employees, directors and officers

Century Aluminum | 2024 Proxy Statement

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Disclaimer

Century Aluminum Company published this content on 18 April 2024 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 19 April 2024 03:01:07 UTC.