--- schema_version: "secwatch.filing_event.v1" accession: "0000949157-23-000053" form_type: "8-K" ticker: "CENX" cik: "0000949157" company_name: "CENTURY ALUMINUM CO" filed_at: "2023-06-09T23:59:59+00:00" generated_at: "2026-06-14T04:35:28.996237+00:00" event_type: "leadership" sentiment: "neutral" materiality_score: 0.5 calibrated_materiality_score: 0.5 confidence: "high" source: SEC EDGAR --- # Century adds director Tamla Olivier; SVP Finance Harrison retires, Trpkovski promoted ## Summary - Tamla Olivier elected to board as seventh independent director, effective June 5, 2023; brings electric utility expertise from Pepco Holdings (Exelon). - Michelle Harrison retires July 1 after 23 years; Peter Trpkovski promoted to SVP Finance and Treasurer. - Annual meeting results: all seven director nominees elected, Deloitte ratified as auditor, say-on-pay approved with annual frequency. ## SEC filing metadata - accession: 0000949157-23-000053 - form_type: 8-K - ticker: CENX - cik: 0000949157 - company_name: CENTURY ALUMINUM CO - filed_at: 2023-06-09T23:59:59+00:00 - event_type: leadership - sentiment: neutral - materiality_score: 0.5 - calibrated_materiality_score: 0.5 - confidence: high - sec_items: 5.02, 5.07, 9.01 - EDGAR index: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/0000949157-23-000053-index.htm - EDGAR primary document: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/cenx-20230605.htm ## Machine-readable alternates - HTML: https://secwatch.observer/filing/0000949157-23-000053 - JSON: https://secwatch.observer/filing/0000949157-23-000053.json - Plain text: https://secwatch.observer/filing/0000949157-23-000053.txt ## Key facts - Executive change Michelle M. Harrison departed as Senior Vice President, Finance and Treasurer at CENTURY ALUMINUM CO. - Action: retire - Role: Senior Vice President, Finance and Treasurer source text: On June 6, 2023, Michelle M. Harrison, Senior Vice President, Finance and Treasurer of the Company notified the Company of her decision to retire after more than 23 years of service with the Company. evidence_url: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/0000949157-23-000053-index.htm - Executive change Peter A. Trpkovski changed role as Senior Vice President, Finance and Treasurer at CENTURY ALUMINUM CO. - Action: promoted - Role: Senior Vice President, Finance and Treasurer source text: In connection with Ms. Harrison's retirement, Peter A. Trpkovski, who is currently serving as Vice President, Finance and Investor Relations of the Company, will be promoted to the role of Senior Vice President, Finance and Treasurer, effective July 1, 2023. evidence_url: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/0000949157-23-000053-index.htm - Shareholder Votes CENTURY ALUMINUM CO shareholders approved Election of Jarl Berntzen, Jennifer Bush, Jesse Gary, Errol Glasser, Wilhelm van Jaarsveld, Andrew Michelmore, and Tamla Olivier to the Company's Board of Directors at the 2023-06-05 meeting. - Proposal: director election - Outcome: passed - Meeting: 2023-06-05 source text: Proposal No. 1: Election of Jarl Berntzen, Jennifer Bush, Jesse Gary, Errol Glasser, Wilhelm van Jaarsveld, Andrew Michelmore, and Tamla Olivier to the Company's Board of Directors The seven persons nominated to serve as directors of the Company received the following number of votes and were elected as directors to serve a one-year term expiring at the annual meeting of stockholders in 2024 evidence_url: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/0000949157-23-000053-index.htm - Shareholder Votes CENTURY ALUMINUM CO shareholders approved Ratification of Appointment of Independent Registered Public Accounting Firm at the 2023-06-05 meeting. - Proposal: auditor ratification - Outcome: passed - Meeting: 2023-06-05 source text: The stockholders ratified the appointment of Deloitte & Touche LLP as the independent registered public accounting firm for the Company for the year ending December 31, 2023 as follows: For Against Abstain Broker Non-Votes 81,302,845 870,854 549,889 - evidence_url: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/0000949157-23-000053-index.htm - Shareholder Votes CENTURY ALUMINUM CO shareholders approved Advisory Vote on the Frequency of Future Advisory Votes on Compensation of Named Executive Officers at the 2023-06-05 meeting. - Proposal: say on pay frequency - Outcome: passed - Meeting: 2023-06-05 source text: The allocation of the votes for the non-binding advisory vote on the frequency of future "say-on-pay" advisory votes was as follows: 1 Year 2 Years 3 Years Abstain Broker Non-Votes 73,713,346 38,107 4,974,621 43,047 3,954,467 evidence_url: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/0000949157-23-000053-index.htm - Shareholder Votes CENTURY ALUMINUM CO shareholders approved Advisory Vote on the Compensation of Named Executive Officers at the 2023-06-05 meeting. - Proposal: say on pay - Outcome: passed - Meeting: 2023-06-05 source text: The stockholders approved, through a non-binding advisory vote, the 2023 compensation of the Company's named executive officers as described in the Company's proxy statement as follows: For Against Abstain Broker Non-Votes 77,489,339 1,252,931 26,851 3,954,467 evidence_url: https://www.sec.gov/Archives/edgar/data/949157/000094915723000053/0000949157-23-000053-index.htm This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.