X0202 SCHEDULE 13G/A 0000921739 XXXXXXXX LIVE 1 Common Stock, par value $0.01 per share 03/31/2026 0000811596 KAISER ALUMINUM CORP 483007704 1550 West McEwen Drive Suite 500 Franklin TN 37067 Rule 13d-1(b) NOMURA ASSET MANAGEMENT INTERNATIONAL INC. DE 0 714176 0 714176 714176 4.4 HC The percent of class is calculated based on 16,340,124 shares of Common Stock outstanding as of March 31, 2026, as reported in the Issuer's quarterly report on Form 10-Q for the fiscal quarter ended March 31, 2026 filed with the SEC on April 23, 2026. NOMURA INVESTMENT MANAGEMENT BUSINESS TRUST DE 0 714176 0 714176 714176 4.4 IA The percent of class is calculated based on 16,340,124 shares of Common Stock outstanding as of March 31, 2026, as reported in the Issuer's quarterly report on Form 10-Q for the fiscal quarter ended March 31, 2026 filed with the SEC on April 23, 2026. KAISER ALUMINUM CORP 1550 West McEwen Drive, Suite 500, Franklin, Tennessee, 37067 Nomura Asset Management International Inc. Nomura Investment Management Business Trust This Schedule 13G excludes securities beneficially owned, if any, by Nomura Holdings Inc. and certain of its subsidiaries whose beneficial ownership of securities are disaggregated from that of Nomura Asset Management International Inc. and the advisory entities underneath Nomura Asset Management International Inc. in accordance with SEC Release No. 34-39538 (January 12, 1998). Each of Nomura Asset Management International Inc. and Nomura Investment Management Business Trust: 100 Independence 610 Market Street Philadelphia, PA 19106-2354 Each of Nomura Asset Management International Inc. and Nomura Investment Management Business Trust: Delaware N IA HC Items 5-11 of the cover pages are incorporated by reference. Items 5-11 of the cover pages are incorporated by reference. Items 5-11 of the cover pages are incorporated by reference. Items 5-11 of the cover pages are incorporated by reference. Items 5-11 of the cover pages are incorporated by reference. Items 5-11 of the cover pages are incorporated by reference. N Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Exhibit A - Joint Filing Agreement NOMURA ASSET MANAGEMENT INTERNATIONAL INC. /s/ Fernando del Puerto 05/15/2026 NOMURA INVESTMENT MANAGEMENT BUSINESS TRUST /s/ Fernando del Puerto 05/15/2026