{"filing":{"accession_number":"0001193125-26-257524","cik":"0000811596","ticker":"KALU","company_name":"KAISER ALUMINUM CORP","form":"8-K","filing_date":"2026-06-04","report_date":null,"primary_document":"kalu-20260604.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/811596/000119312526257524/kalu-20260604.htm"},"events":[{"id":6820,"run_id":5977,"accession_number":"0001193125-26-257524","anchor_item_number":"5.07","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"summary":"Kaiser Aluminum held its 2026 Annual Meeting of Stockholders, with results including election of three Class I directors (Hoffman, Minor, Wilcox), advisory approval of named executive officer compensation (98.68% for), ratification of Deloitte \u0026 Touche LLP as independent auditor (98.20% for), and approval of the Amended 2021 Equity and Incentive Compensation Plan increasing available shares by 395,000 (94.43% for).","company_name":"KAISER ALUMINUM CORP","ticker":"KALU","filing_date":"2026-06-04","form":"8-K","submitted_at":null,"items":[{"id":4351,"accession_number":"0001193125-26-257524","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_compensation","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"The disclosure centers on stockholder approval of an amendment to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, increasing available shares by 395,000 for future awards to executives and employees. This is a compensatory arrangement amendment requiring shareholder approval, directly affecting the pool of equity available for executive compensation. The materiality is evident from the shareholder vote requirement and the substantial increase in authorized shares for compensation purposes.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-05T04:58:44.390830+00:00","company_name":"","ticker":null,"filing_date":""},{"id":4352,"accession_number":"0001193125-26-257524","item_number":"5.07","item_title":"Submission of Matters to a Vote of Security Holders.","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"reasoning":"This Item 5.07 discloses the final voting results from Kaiser Aluminum's 2026 Annual Meeting of Stockholders, including election of three Class I directors (Hoffman, Minor, Wilcox), advisory approval of named executive officer compensation (98.68% for), ratification of Deloitte \u0026 Touche LLP as independent auditor (98.20% for), and approval of the Amended 2021 Plan (94.43% for). The disclosure directly matches the shareholder_vote_results event type and is material to investors assessing governance and compensation matters.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-05T04:58:44.390830+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":4351,"accession_number":"0001193125-26-257524","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_compensation","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"The disclosure centers on stockholder approval of an amendment to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, increasing available shares by 395,000 for future awards to executives and employees. This is a compensatory arrangement amendment requiring shareholder approval, directly affecting the pool of equity available for executive compensation. The materiality is evident from the shareholder vote requirement and the substantial increase in authorized shares for compensation purposes.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-05T04:58:44.390830+00:00","company_name":"KAISER ALUMINUM CORP","ticker":"KALU","filing_date":"2026-06-04"},{"id":4352,"accession_number":"0001193125-26-257524","item_number":"5.07","item_title":"Submission of Matters to a Vote of Security Holders.","event_type":"shareholder_vote_results","event_domain":"governance","is_material":true,"confidence":0.98,"reasoning":"This Item 5.07 discloses the final voting results from Kaiser Aluminum's 2026 Annual Meeting of Stockholders, including election of three Class I directors (Hoffman, Minor, Wilcox), advisory approval of named executive officer compensation (98.68% for), ratification of Deloitte \u0026 Touche LLP as independent auditor (98.20% for), and approval of the Amended 2021 Plan (94.43% for). The disclosure directly matches the shareholder_vote_results event type and is material to investors assessing governance and compensation matters.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-05T04:58:44.390830+00:00","company_name":"KAISER ALUMINUM CORP","ticker":"KALU","filing_date":"2026-06-04"}]}