Kaiser Aluminum CORP 8-K Filing

Ticker: KALU · Form: 8-K · Filed: Nov 5, 2025 · CIK: 811596

Sentiment: neutral

Filing Stats: 964 words · 4 min read · ~3 pages · Grade level 10.4 · Accepted 2025-11-05 16:50:50

Key Financial Figures

Filing Documents

Financial Statements and Exhibits

Financial Statements and Exhibits. (d) Exhibits. Number Exhibit 4.1 Indenture, dated November 5, 2025, among Kaiser Aluminum Corporation, each of the guarantors named therein and Computershare Trust Company, N.A., as Trustee. 4.2 Form of 5.875% Senior Note due 2034 (included in Exhibit 4.1). 99.1 Press release dated November 5, 2025. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. KAISER ALUMINUM CORPORATION Date: November 5, 2025 By: /s/ John M. Donnan John M. Donnan Executive Vice President, Chief Administrative Officer and General Counsel -3-

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