Update on Acquisition

October 1, 2026 BSE Limited National Stock Exchange of India Limited Luxembourg Stock Exchange Scrip Code: 500440 Scrip Code: HINDALCO Scrip Code: US4330641022 Sub: Sixth Update: Acquisition of AluChem Companies, Inc. by Aditya Holdings LLC, a step-down wholly owned subsidiary of Hindalco Industries Limited [“Company”]. Ref: a. Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015 b. ISIN: INE038A01020 and c. Our Intimations dated June 24, 2025, October 23, 2025, February 11, 2026 , February 26, 2026 , May 20, 2026 and August 7, 2026. Pursuant to the above referred intimations regarding the proposed acquisition of AluChem Companies, Inc. [“AlucChem”], and its specialty calcined and tabular alumina business, AluChem and the Company, after due consideration, have jointly decided to terminate the Equity Purchase Agreement due to extended closure delays beyond the control of either party. Hindalco’s broader strategy of scaling high-value, technology led value-added products (VAP) in its specialty alumina business remains unchanged, and the Company will continue to evaluate opportunities, including in the United States, consistent with this strategy. AluChem will continue to independently serve their customers across the specialty alumina value chain, as they have been doing for the last 48 years. This will also be made available on the website of the Company www.hindalco.com The above is for your information and dissemination. Sincerely, or Hindalco Industries Limited Geetika Anand Company Secretary & Compliance Officer Hindalco Industries Limited Registered Office: 21st Floor, One Unity Center, Senapati Bapat Marg, Prabhadevi, Mumbai – 400013, India |T: +91 22 69477000 / 69477150 I F: +91 2269477001/69477090 W: www.hindalco.com |E: hilinvestors@adityabirla.com | Corporate ID No.: L27020MH1958PLC011238