Resignation

September 16, 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 under Regulation 30 of the Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations, 2015 (“SEBI Listing Regulations”) – Resignation of Mr Vadalur Subramanian Radhakrishnan (“V S Radhakrishnan”) from the Board of Directors of the Company In terms of Regulation 30 of the SEBI Listing Regulations, we hereby inform that Mr V S Radhakrishnan (DIN: 08064705), Non-Executive Non-Independent Director of the Company vide letter dated September 15, 2026 has submitted his resignation from the Directorship of the Company, with immediate effect. (Letter received from Mr V S Radhakrishnan is attached). The requisite details under Regulation 30(6) read with Schedule III Part A Para A [7 & 7(C)] of the SEBI Listing Regulations and SEBI Master Circular No. HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated January 30, 2026 are as under; S. No. Disclosure Requirements Details 1. Reason for Change viz., Resignation appointment, re-appointment resignation, removal, death or otherwise 2. Date of appointment/re- With immediate effect appointment/cessation (as (i.e., September 15, 2026) applicable) & term of appointment/re- appointment; 3. Brief profile (in case of Not Applicable appointment); 4. Disclosure of relationships Not Applicable between Directors (in case of appointment of a Director). Date and Time of occurrence of the information: September 15, 2026: 9.26 PM (IST) We request you to take the above on your record. Thanking you, Yours Faithfully, For Chemplast Sanmar Limited P Srinivasan Company Secretary and Compliance Officer Memb.No. ACS-10129