We submit herewith disclosure of closure of Trading Window w.e.f. October 01, 2026.

September 28, 2026 BSE Limited National Stock Exchange of India Limited 25, P. J. Towers, Exchange Plaza, C-1, Block G, Dalal Street, Bandra — Kurla Complex, Bandra (E) Mumbai – 400 001 Mumbai — 400 051 Scrip Code: 500120 Symbol: DIAMINESQ Sub: Intimation of Closure of Trading Window Dear Sir/Ma’am, This is to inform you that pursuant to SEBI (Prohibition of Insider Trading) Regulations, 2015, as amended and as per the ‘Code of Internal procedures and conduct for regulating, monitoring and reporting of trading by insiders’ adopted by the Company, the Trading Window for the Designated Persons, Immediate Relatives of Designated Persons and Connected Persons will remain closed from October 01, 2026 until 48 hours after the declaration of Unaudited Financial Results for the quarter and half year ending September 30, 2026. The date of the Board Meeting at which the said Unaudited Financial Results for the quarter and half year ending September 30, 2026, will be considered, shall be intimated in due course. Kindly take the above information on your records. Yours faithfully, For Diamines and Chemicals Limited Hemaxi Pawar Company Secretary Membership No.: A52581 Diamines and Chemicals Limited (CIN No.L24110GJ1976PLC002905) Plot No. 13 P.C.C. Area, P.O. Petrochemicals, Dist. Vadodara 391346, Gujarat (India). T: +91 265 3534200, F: +91 265 2230218 E: info@dacl.co.in, W:dacl.co.in