Closure of Trading Window

September 24, 2026 National Stock Exchange of India Limited BSE Limited Exchange Plaza Listing Operations Bandra-Kurla Complex, Bandra (E) P J Towers Dalal Street Mumbai-400051 Mumbai-400001 Symbol-ACI Scrip Code- 543657 Dear Sirs, Sub: Intimation of closure of Trading Window under SEBI (Prohibition of Insider Trading) Regulations, 2015 – Un-Audited Financial Results for the quarter and half year ending September 30, 2026 Pursuant to the SEBI (Prohibition of Insider Trading) Regulations, 2015, as amended from time to time and Company’s Code of Conduct for Prevention of Insider Trading, it is hereby informed that in view of finalization of Un-Audited Financial Results (both Standalone and Consolidated) for the quarter and half year ending September 30, 2026, the trading window for dealing in the Company's equity shares by the designated persons and their immediate relatives (as defined in the said Code) shall remain closed from October 01, 2026 till 48 hours after the declaration of said financial results. The date of the Board Meeting would be intimated in due course. Kindly take the same on record. Thanking you, Yours faithfully For Archean Chemical Industries Limited Vijayaraghavan N E Company Secretary & Compliance Officer M. No. A41671 Corporate Office: SKCL Summit, No. 47/C3, 10th Floor, Gandhi Mandapam Road, Kotturpuram, Chennai – 600085 Registered Office: No.2, North Crescent Road, T Nagar, Chennai, Tamil Nadu, India – 600017 CIN: L24298TN2009PLC072270 | info@archeanchemicals.com | Ph: +91 44 - 610 99 999 | www.archeanchemicals.com