Trading Window

Biocon Limited 20th KM, Hosur Road Electronic City Bangalore 560 100, India T: 91 80 2808 2808 F: 91 80 2852 3423 CIN: L24234KA1978PLC003417 www.biocon.com Email: co.secretary@biocon.com BIO/SECL/TG/2026-27/69 September 30, 2026 To, To, The Manager The Manager BSE Limited National Stock Exchange of India Limited Department of Corporate Services Corporate Communication Department Phiroze Jeejeebhoy Towers, Exchange Plaza, Bandra Kurla Complex Dalal Street, Mumbai – 400 001 Mumbai – 400 051 Scrip Code – 532523 Scrip Symbol – Biocon Dear Sir/Madam, Subject: Intimation regarding closure of Trading Window Pursuant to the provisions of the Securities and Exchange Board of India (Prohibition of Insider Trading) Regulations, 2015 and Code of Conduct for Prevention of Insider Trading of the Company for regulating, monitoring and reporting of trading by insiders, we hereby inform you that the Trading Window for dealing in shares of Biocon Limited shall remain closed from Thursday, October 01, 2026 until 48 hours after declaration of the financial results of the Company for the quarter and half year ending September 30, 2026. The date of the Board Meeting for declaration of financial results of the Company for the quarter and half year ending September 30, 2026, will be intimated in due course. Kindly take the above information on record. Thanking You, Yours faithfully, For Biocon Limited Rajesh U. Shanoy Company Secretary and Compliance Officer M. No.: ACS 16328