Certificate under Reg.74(5) of SEBI (DP)Regulations, 2018

October 13, 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: Certificate under Regulation 74 (5) of SEBI (Depositories and Participants) Regulations, 2018 for the quarter ended September 30, 2026 Please find enclosed herewith the Certificate received from KFin Technologies Limited, the Registrar and Share Transfer Agent of the Company, for the quarter ended September 30, 2026. This report is submitted in compliance with Regulation 74(5) of the SEBI (Depositories and Participants) Regulations, 2018. We request you to take the above on record. Thanking you, Yours faithfully, For CHEMPLAST SANMAR LIMITED P SRINIVASAN Company Secretary & Compliance Officer Memb.No.ACS-10129 KFIN/CPSL/CDSL/74(5) E/1 Date: 01‐10‐2026 CENTRAL DEPOSITORY SERVICES (INDIA) LIMITED REGD OFF: MARATHON FUTUREX, A WING 25TH FLOOR NM JOSHI MARG LOWER PAREL (EAST) MUMBAI ‐ 400 023 Dear Sir(s), Sub: Certificate under Regulation 74(5) for the quarter ended September 30,2026 We as Registrar to an Issue and Share Transfer Agent of the CHEMPLAST SANMAR LIMITED, certify that the details of securities dematerialized/rematerialized during the aforesaid period, as required under Regulation 74(5) of SEBI (Depositories and participants) Regulations 2018 have been furnished to all the Stock Exchanges where the shares of the company are listed. Thanking You Yours faithfully, for KFIN TECHNOLOGIES LIMITED VAGOLU RATNA BABU ASSISTANT VICE PRESIDENT CC TO: CHEMPLAST SANMAR LIMITED 9, CATHEDRAL ROAD CHENNAI TAMIL NADU 600086 KFIN/CPSL/NSDL/74(5) E/1 Date: 01‐10‐2026 NATIONAL SECURITIES DEPOSITORY LIMITED TRADE WORLD 4TH FLOOR KAMALA MILLS COMPOUND SENAPATI BAPAT MARG LOWER PAREL MUMBAI ‐ 400 013 Dear Sir(s), Sub: Certificate under Regulation 74(5) for the quarter ended September 30,2026 We as Registrar to an Issue and Share Transfer Agent of the CHEMPLAST SANMAR LIMITED, certify that the details of securities dematerialized/rematerialized during the aforesaid period, as required under Regulation 74(5) of SEBI (Depositories and participants) Regulations 2018 have been furnished to all the Stock Exchanges where the shares of the company are listed. Thanking You Yours faithfully, for KFIN TECHNOLOGIES LIMITED VAGOLU RATNA BABU ASSISTANT VICE PRESIDENT CC TO: CHEMPLAST SANMAR LIMITED 9, CATHEDRAL ROAD CHENNAI TAMIL NADU 600086