Kaiser Aluminum Corporation – Material Contracts Watch

from 8-K 4 pages Keith A. Harvey Re: Transition Letter, Executive Chairman Dear Keith,

from 8-K 28 pages Kaiser Aluminum Corporation Key Employee Severance Benefit Plan 1

from 8-K 4 pages Material contract

from 8-K 26 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan

from 10-Q 16 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (As Amended and Restated) Performance Shares Award Agreement You Have Been Selected to Receive a Grant of Performance Shares Pursuant to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as Amended and Restated (The “Plan”), as Specified Below: Participant: [ ] Date of Grant: [ ] Number of Performance Shares Granted: [ ] End of Performance Period: December 31, 2028

from 10-Q 13 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (As Amended and Restated) Restricted Stock Unit Award Agreement You Have Been Selected to Receive a Grant of Restricted Stock Units Pursuant to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as Amended and Restated (The “Plan”), as Specified Below: Participant: [ ] Date of Grant: [ ] Number of Restricted Stock Units Granted: [ ] Vesting Schedule: The Restricted Stock Units Granted Shall Vest as Follows: Date(s) on Which Restricted Stock Units Granted Vest Number of Restricted Stock Units Which Vest Thereon

from 10-Q 6 pages Kaiser Aluminum 2026-2028 Long-Term Incentive Plan Performance Shares

from 10-Q 6 pages Kaiser Aluminum 2026 Short-Term Incentive Plan for Key Managers

from 8-K 3 pages Keith A. Harvey Chairman, Chief Executive Officer and President January 7, 2026

from 10-Q 11 pages Amended and Restated Director Designation Agreement

from 10-Q 16 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (As Amended and Restated) Performance Shares Award Agreement You Have Been Selected to Receive a Grant of Performance Shares Pursuant to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as Amended and Restated (The “Plan”), as Specified Below: Participant: [ ] Date of Grant: [ ] Number of Performance Shares Granted: [ ] End of Performance Period: December 31, 2027

from 10-Q 12 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (As Amended and Restated) Restricted Stock Unit Award Agreement You Have Been Selected to Receive a Grant of Restricted Stock Units Pursuant to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as Amended and Restated (The “Plan”), as Specified Below: Participant: [ ] Date of Grant: [ ] Number of Restricted Stock Units Granted: [ ] Vesting Schedule: The Restricted Stock Units Granted Shall Vest as Follows: Date(s) on Which Restricted Stock Units Granted Vest Number of Restricted Stock Units Which Vest Thereon

from 10-Q 6 pages Kaiser Aluminum 2025-2027 Long-Term Incentive Plan Performance Shares

from 10-Q 6 pages Kaiser Aluminum 2025 Short-Term Incentive Plan for Key Managers

from 10-K 6 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (Amended and Restated Effective June 11, 2024) Restricted Stock Award Agreement as a Director of Kaiser Aluminum Corporation, a Delaware Corporation (The “Company”), You Are Receiving This Grant of Restricted Stock Pursuant to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as Amended and Restated (The “Plan”), as Specified Below: Director: Date of Grant: Number of Shares of Restricted Stock Granted: Lapse of Restrictions: Restrictions Placed on the Shares of Restricted Stock Shall Lapse on the Dates and in the Numbers Listed Below: Date on Which Restrictions Lapse Number of Shares for Which Restrictions Lapse This Restricted Stock Award Agreement, Effective as of the Date of Grant Set Forth Above (This “Agreement”), Represents the Grant of Restricted Stock by the Company to the Director Named Above, Pursuant to the Provisions of the Plan

from 8-K 28 pages Kaiser Aluminum Corporation Key Employee Severance Benefit Plan 1

from 10-Q 2 pages Compensation of Directors Effective as of June 11, 2024

from 8-K 26 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (Amended and Restated Effective June 11, 2024) 1. Purpose. the Purpose of This Plan Is to Permit Award Grants to Non-Employee Directors and Officers, Other Employees and Certain Service Providers of the Company and Its Subsidiaries and to Provide to Such Persons Incentives and Rewards for Service and/or Performance. 2. Definitions. as Used in This Plan: (A) “Appreciation Right” Means a Right Granted Pursuant to Section 5 of This Plan, and Will Include Tandem Appreciation Rights and Free-Standing Appreciation Rights. (B) “Base Price” Means the Price to Be Used as the Basis for Determining the Spread Upon the Exercise of a Free-Standing Appreciation Right or a Tandem Appreciation Right. (C) “Board” Means the Board of Directors of the Company. (D) “Cash Incentive Award” Means a Cash Award Granted Pursuant to Section 8 of This Plan. (E) “Change in Control” Has the Meaning Set Forth in Section 12 of This Plan. (F) “Code” Means the Internal Revenue Code of 1986, as Amended, and the Regulations Thereunder, as Such Law and Regulations May Be Amended From Time to Time. (G) “Committee” Means the Compensation Committee of the Board (Or Its Successor(s)), or Any Other Committee of the Board Designated by the Board to Administer This Plan Pursuant to Section 10 of This Plan. (H) “Common Shares” Means the Shares of Common Stock, Par Value $0.01 Per Share, of the Company or Any Security Into Which Such Common Stock May Be Changed by Reason of Any Transaction or Event of the Type Referred to in Section 11 of This Plan. (I) “Company” Means Kaiser Aluminum Corporation, a Delaware Corporation, and Its Successors

from 10-Q 16 pages Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan Performance Shares Award Agreement You Have Been Selected to Receive a Grant of Performance Shares Pursuant to the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan (The “Plan”), as Specified Below: Participant: [ ] Date of Grant: [ ] Number of Performance Shares Granted: [ ] End of Performance Period: December 31, 2026

from 10-Q 6 pages Kaiser Aluminum 2024-2026 Long-Term Incentive Plan Performance Shares