Intimation of Closure of trading window for the half year ended 30 September, 2026.

CHEMIESYNTH (VAPI) LIMITED Regd office: Plot No. 27, GIDC, Phase-1, Vapi – 396195, Gujarat. CIN: L24110GJ1986PLC008634, GST Reg no: 24AAACC9688H1ZC, Telephone no: 022-21010500, Web: https://www.chemiesynth.com Email id: compliance@chemiesynth.com Date: 25.09.2026 The General Manager Listing Department, BSE Limited Phiroze Jeejeebhoy Towers, Dalal Street, Mumbai 400001, Maharashtra. Sub : Intimation of Closure of Trading Window. Scrip Code : 539230 Dear Sir/Madam, We hereby inform you that pursuant to Company’s Code of Internal Procedures and Conduct for Regulating, Monitoring and Reporting of Trading by insiders and in compliance with SEBI (Prohibition of Insider trading) Regulations, 2015, the Trading window for dealing in the Company's securities shall remain closed from Thursday, 01st October, 2026 until 48 hours after the announcement of the un-audited financial results of the Company for the half year ended September 30, 2026. The board meeting where inter-alia, the approval of un-audited financial statements for the half year ended September 30, 2026 will be held on or before November14, 2026. Accordingly, all designated persons and their immediate relatives have been advised no to trade in the securities of the Company during the aforesaid period of closure of trading window. Kindly take the above information on record. Thanking You, Yours Faithfully, For Chemiesynth (Vapi) Limited Pranali Dholabhai Company Secretary & Compliance Officer M’ship no. A 50933. Place: Vapi, Gujarat.