Closure of Trading Window

HeidelbergCement India Limited CIN: L26942HR1958FLC042301 Registered Office 2nd Floor, Block B, DLF Cyber Greens, DLF Cyber City, Phase-III, Gurugram, Haryana 122002, India Phone +91-124-4503700 Fax +91-124-4147698 Website: www.mycemco.com HCIL:SECTL:SE:2026-27 25 September 2026 BSE Ltd. National Stock Exchange of India Ltd. Listing Department Listing Department, Phiroze Jeejeebhoy Towers Exchange Plaza, C/1, Block G, Dalal Street, Fort, Bandra Kurla Complex, Bandra (E) Mumbai - 400001 Mumbai - 400 051 Scrip Code:500292 Trading Symbol: Heidelberg Dear Sir/Madam, Sub: Closure of Trading Window for dealing in Equity Shares In accordance with the SEBI (Prohibition of Insider Trading) Regulations, 2015 read with the Company’s Code of Conduct to Regulate, Monitor and Report Trading by Insiders, please note that the Trading Window for dealing in Equity Shares of the Company by the Promoters and Persons Acting in Concert, Directors, Designated Persons and their Immediate Relatives shall remain closed with effect from 01 October 2026. The Trading Window will reopen two days after the declaration of Unaudited Financial Results for the 2nd quarter ended 30 September 2026. The date of Board Meeting for consideration and approval of the said Unaudited financial results will be communicated separately in due course of time. Thanking you, Yours Faithfully, For HeidelbergCement India Ltd. Ravi Arora Company Secretary & Compliance Officer