Detailed disclosure is attached.

27 September 2026 BSE Limited (Security Code: 524314) Phiroze Jeejeeboy Towers, Dalal Street, Fort, Mumbai- 400 001. Dear Sirs, Sub: Intimation of Closure of trading window under SEBI (PIT) Regulations, 2015 This is to inform you that pursuant to the provisions of the SEBI (Prohibition of Insider Trading) Regulations, 2015 read with the Company’s Code of Conduct to Regulate, Monitor and Report Trading by designated persons & their immediate relatives (including all insiders), the Trading Window in respect of dealings in the Equity Shares of the Company, will remain closed, for all the designated persons of the Company & their immediate relatives (including all insiders), with effect from 1 October 2026 till the end of forty eight hours after the declaration of Unaudited Financial Results of the Company for the Second quarter ending on 30 September 2026. The trading window in respect of dealing in the shares of the Company shall reopen after mandatory period of window closure is over. Please also note that the date of Board Meeting for considering the Unaudited Financial Results for the second quarter ending on 30 September 2026 will be intimated in due course. Kindly take note of the same and acknowledge. Thanking you, Yours Faithfully, For Gujarat Terce Laboratories Limited Ashka Solanki Company Secretary (Membership.No.: A56817)