Intimation for Trading Window Closure for the quarter ended September 30, 2026.

www.stl.tech September 28, 2026 National Stock Exchange of India Limited BSE Limited Exchange Plaza, 5th Floor, Phiroze Jeejeebhoy Towers, Plot No. C-1, G Block, Dalal Street, Bandra Kurla Complex, Bandra (East) Mumbai - 400 001 Mumbai - 400 051 Scrip ID - STLTECH Scrip Code - 532374 Sub.: Intimation of Closure of Trading Window Dear Sir/Madam, In terms of provisions of Securities and Exchange Board of India (Prohibition of Insider Trading) Regulations, 2015 and ‘Code of Conduct for Regulating, Monitoring and Reporting of trading by insiders’ of Sterlite Technologies Limited, the “Trading Window” for trading in the equity shares of the Company by Designated Persons and their immediate relatives will remain closed from Thursday, October 1, 2026 till the expiry of 48 hours after the declaration of unaudited standalone and consolidated financial results for the quarter and half year ended September 30, 2026 (both days inclusive). The date of Board meeting at which approval of the unaudited standalone and consolidated financial results for the quarter and half year ended September 30, 2026 will be considered, shall be announced in due course. Kindly take this on your record. Thanking you. Yours faithfully, For Sterlite Technologies Limited Mrunal Asawadekar Company Secretary and Compliance Officer Membership No.: A24346 Sterlite Technologies Limited Reg istered office: 4th Floor, Godrej Millennium, Koregaon Road 9, STS 12/1, Pune, Maharashtra- 411 001, India. CIN - L31300PN2000PLC202408