Archean Chemical Industries Ltdhas informed BSE that the meeting of the Board of Directors of the Company is scheduled on 29/10/2026 ,inter alia, to consider and approve the Un-Audited Financial Results (both the standalone & consolidated) for the quarter and half year ended September 30, 2026.

October 22, 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 Sir/Madam, Sub: Board Meeting Intimation Ref: Company’s trading window closure intimation letter dated – September 24, 2026 Pursuant to Regulation 29(1) of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015, we wish to inform you that, a meeting of the Board of Directors of the Company is scheduled to be held on Thursday, October 29, 2026, at Chennai, inter alia to consider and approve the Un-Audited Financial Results (both the standalone & consolidated) for the quarter and half year ended September 30, 2026. A copy of the Un-Audited Financial Results will be forwarded to you immediately after the Meeting. Further we will be publishing the Financial Results as required under Regulation 47 of SEBI LODR. Furtherance to our earlier letter dated September 24, 2026 and considering the above, as per SEBI (Prohibition of Insider Trading) Regulations, 2015 and the Code of Conduct for prevention of Insider Trading, the trading window for dealing in the Company's equity shares by the Designated Persons and their Immediate Relatives shall remain closed till the end of October 31, 2026. The aforesaid intimation is also being hosted on the website of the Company www.archeanchemicals.com . Thanking you Yours faithfully For Archean Chemical Industries Limited Vijayaraghavan N E Company Secretary & Compliance Officer M. No. A41671 Enc: as above 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