Kindly refer to the intimation of trading window closure.

GUJARAT THEMIS BIOSYN LIMITED CIN: L24230GJ1981PLC004878 REGD. OFFICE &FACTORY: 69/C GIDC INDUSTRIAL ESTATE, VAPI – 396 195, DIST. VALSAD, GUJARAT, INDIA TEL: 0260-2430027 / 2400639 E-mail:hrm@gtbl.in.net GTBL/BSE/NSE/2026-27/65 23rd September, 2026 Listing Department Department of Corporate Services National Stock Exchange of India Limited BSE Limited Exchange Plaza, C-1, Block-G Phiroze Jeejeebhoy Towers, Dalal Street Bandra Kurla Complex Mumbai 400001 Bandra East, Mumbai 400051 Symbol: GUJTHEM Scrip Code: 506879 Dear Sir / Madam, Sub:- Intimation of closure of Trading Window in terms of SEBI (Prohibition of Insider Trading) Regulations, 2015: Pursuant to the provisions of SEBI (Prohibition of Insider Trading) Regulations, 2015 and Company’s Code of Conduct for prevention of Insider Trading, it is hereby notified that the Trading Window i.e. period for trading in Company’s shares / securities will be closed with effect from Thursday, 1st October , 2026 and will re-open after completion of 48 hours from the declaration of un-audited financial results for the quarter and half year ending 30th September, 2026 by the Board of Directors of the Company. The date of Board Meeting for considering the said financial results for the quarter and half year ending 30th September, 2026 will be intimated in due course. We request you to kindly take this intimation on record. Thanking you, Yours faithfully For Gujarat Themis Biosyn Limited Vineet Gawankar Company Secretary & Compliance Officer MUMBAI OFFICE: Themis House, 11/12 Udyog Nagar, S.V Road, Goregaon (West), Mumbai – 400 104 Tel: 91-22-67607080 / 28757836 Fax: 28746621 / 67607019; E-mail: gtblmumbai@gtbl.in Website Address: www.gtbl.in