Please find enclosed ESG Rating assigned by SES ESG Research Private Limited

July 29, 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 read with Schedule III of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 (‘SEBI Listing Regulations’) This is to inform you that SES ESG Research Private Limited (SES) has, vide its report received by the Company on July 28, 2026, assigned an Environmental, Social, and Governance (ESG) Score (Adjusted) of 67.8 to Tata Chemicals Limited based on the data pertaining to FY 2025-26. Please note that the Company has not engaged SES for ESG Rating. SES has independently prepared the report based on data pertaining to FY 2025-26 of the Company available in public domain. This disclosure is in compliance with Regulation 30 of SEBI Listing Regulations read with the SEBI Master Circular HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated January 30, 2026. This is also being made available on the website of the Company at www.tatachemicals.com. This is for your information and records. Thanking you. Yours faithfully, For Tata Chemicals Limited Jeraz E. Mahernosh Company Secretary (FCS 7008)