Chemplast Sanmar Ltdhas informed BSE that the meeting of the Board of Directors of the Company is scheduled on 04/11/2026 ,inter alia, to consider and approve and take on record the Unaudited Standalone as well as Consolidated Financial Results along with the Limited Review Report thereon of the Company for the quarter and half year ended 30th September, 2026.

28th October, 2026 BSE Limited National Stock Exchange of India Limited Floor 24 P J Towers Exchange Plaza, Dalal Street Plot No. C/1G, Block Mumbai 400 001 Bandra-Kurla Complex, Bandra (East) Scrip Code: 543336 Mumbai 400 051 Scrip Symbol: CHEMPLASTS Dear Sir/Madam, Sub: Intimation of Board Meeting for approval of Unaudited Standalone and Consolidated Financial Results for the quarter and half year ended 30th September, 2026 and Update on Trading window closure. Pursuant to Regulation 29 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, we wish to inform you that meeting of the Board of Directors of Chemplast Sanmar Limited (“the Company”) is scheduled to be held on Wednesday, the 4th November, 2026, inter alia, to consider, approve and take on record the Unaudited Standalone as well as Consolidated Financial Results along with the Limited Review Report thereon of the Company for the quarter and half year ended 30th September, 2026. In continuation of our letter dated 28th September, 2026 regarding Trading Window Closure, we would like to inform you that pursuant to the Company's 'Code of Conduct' for Prevention of Insider Trading (Code of Conduct) under the SEBI (Prohibition of Insider Trading) Regulations, 2015, as amended, the Trading Window for dealing in equity shares of the Company shall remain closed for the Designated Persons and their immediate relatives defined under the 'Code of Conduct' from Thursday, the 1st October, 2026 till Friday, the 6th November, 2026. i.e., [end date of two clear trading days after the communication of Unaudited Financial Results of the Company for the quarter and half year ended 30th September, 2026 to the Stock Exchanges]. This is for your information and records. Thanking you, Yours faithfully, For CHEMPLAST SANMAR LIMITED P Srinivasan Company Secretary & Compliance Officer Memb. No. ACS 10129