Trading Window

September 21, 2026 The General Manager The Manager Corporate Relations Department National Stock Exchange of India Ltd. BSE Limited Exchange Plaza Phiroze Jeejeebhoy Towers Bandra-Kurla Complex Dalal Street Bandra (E) Mumbai – 400 001 Mumbai – 400 051 Scrip Code: 500770 S ymbol: TATACHEM Dear Sirs, Sub: Intimation of Closure of Trading Window In accordance with the ‘Tata Code of Conduct for Prevention of Insider Trading’ pursuant to the SEBI (Prohibition of Insider Trading) Regulations, 2015, as amended from time to time, the Trading Window for dealing in the Company’s securities will be closed from Thursday, September 24, 2026. The closure is in connection with the declaration of the Financial Results of the Company for the second quarter and half-year ending September 30, 2026. The Trading Window will open 48 hours after the said financial results are declared to the Stock Exchanges. The date of the Board Meeting for the approval of the said Financial Results will be intimated in due course. The above information is also available on the website of the Company at www.tatachemicals.com. You are requested to take the same on record. Thanking you, Yours faithfully, For Tata Chemicals Limited Jeraz E. Mahernosh Company Secretary (FCS 7008)