General Updates

September 12, 2026 The General Manager The Manager Corporate Relations Department Listing Department BSE Limited National Stock Exchange of India Limited Phiroze Jeejeebhoy Towers Exchange Plaza Dalal Street Bandra-Kurla Complex, Bandra (E) Mumbai – 400 001 Mumbai – 400 051 Scrip Code: 500770 Symbol: TATACHEM Dear Sirs, Sub.: Intimation under Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 Further to our letter and Press Release dated August 29, 2026, informing that Tata Chemicals North America Inc. (‘TCNA’), a wholly owned subsidiary of Tata Chemicals Limited, was declared the successful bidder in the Chapter 11 bankruptcy proceedings of Searles Valley Minerals Inc. (‘SVM’), USA, for the acquisition of North American soda ash customer contracts representing over 500,000 metric tonnes to be serviced over a period of two years, we wish to inform that TCNA has successfully completed the acquisition of customer contracts on September 11, 2026, following the satisfaction of all conditions precedent and other terms set out in the Assignment and Assumption Agreement. We request you to take the aforesaid disclosure on record. This intimation is also being made available on the website of the Company at www.tatachemicals.com. Thanking you, Yours faithfully, For Tata Chemicals Limited Jeraz E. Mahernosh Company Secretary (FCS 7008)