Intimation on Closure of Trading Window is enclosed.

castrol.co.in 24 September 2026 BSE Limited National Stock Exchange of India Limited Phiroze Jeejeebhoy Towers, Exchange Plaza, C-1, Block G, Dalal Street, Bandra Kurla Complex, Bandra East, Mumbai – 400 001 Mumbai – 400 051 Scrip Code: 500870 Scrip Symbol: CASTROLIND Dear Sir/Madam, Sub.: Intimation of Closure of Trading Window We wish to inform you that in terms of the Company’s Code of Conduct to Regulate, Monitor and Report Trading by Designated Persons, framed pursuant to the SEBI (Prohibition of Insider Trading) Regulations, 2015, the trading window for dealing in the shares of the Company will remain closed for Designated Persons and Insiders, from the end of the quarter i.e. 30 September 2026 till two trading days after the declaration of the unaudited financial results of the Company for the quarter ending 30 September 2026. The date of the Board Meeting to consider the unaudited financial results of the Company for the quarter ending 30 September 2026 will be intimated in due course. The above information will also be made available on the Company's website at www.castrol.co.in This is for your information and records. Thank you. Yours faithfully, For Castrol India Limited Hemangi Ghag Company Secretary & Compliance Officer Registered address: Castrol India Limited CIN: L23200MH1979PLC021359 Technopolis Knowledge Park, Mahakali Caves Road, Andheri (East), Mumbai – 400093 Tel: +91 22 7177 7111/ Fax: +91 22 66 984 101 Customer Service Toll Free No: 1800222100 / 18002098100