Please refer the attached intimation.

September 24, 2026 Listing Compliance Department BSE Limited, Phiroze Jeejeebhoy Towers, Dalal Street, Fort Mumbai — 400 001. REF: SCRIP CODE: 500422 ISIN: INE019B01010 Dear Sir/ Madam, Subject: Intimation of Closure of Trading Window This is to inform you that in terms of the Company’s “Code of Conduct for Prevention of Insider Trading” adopted by the Company under the Securities and Exchange Board of India (Prohibition of Insider Trading) Regulations, 2015 read with amendments thereto and further referring to the clarifications regarding trading restriction period given by BSE Limited vide its circular dated April 02, 2019 vide Ref No: LIST/COMP/01/2019-20, the Trading Window for dealing in the securities of the Company shall remain closed for all Designated Persons and their immediate relatives with effect from October 01, 2026 till the end of 48 hours after declaration of the Un-Audited Financial Results (Standalone and Consolidated) for the quarter and half-year ended September 30, 2026. In accordance with the SEBI circular SEBI/HO/ISD/ISD-PoD-2/P/CIR/2023/124 dated July 19, 2023 and SEBI/HO/ISD/ISD-PoD-2/P/CIR/2025/55 dated April 21, 2025, the Company has updated the information on NSDL portal for restricting the trading by Designated Persons and their immediate relatives by freezing their PAN at security level. The date of Board Meeting for consideration and declaration of the Un-Audited Financial Results (Standalone and Consolidated) for the quarter and half-year ended September 30, 2026, shall be intimated to you separately. Request you to kindly take the above information on your records. Thanking you. Yours faithfully, For Transchem Limited Neeraja Karandikar Company Secretary ACS – 10130 CIN: L66120MH1976PLC019327 Registered Office: 111, Maker Chambers IV, 11th Floor, Nariman Point, Mumbai - 400021 Tel.: +91 22 43347000 Fax: + 91 22 43347002 E-mail: secretary@transchem.net Website: www.transchem.net