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SUB: COMPLIANCE WITH REGULATION 74(5) OF SEBI (DEPOSITORIES & PARTICIPANTS) REGULATIONS, 2018 - - - - - We are enclosing herewith Certificate received from KFin Technologies Limited, the Registrar & Transfer Agents of Chennai Petroleum Corporation Limited (CPCL) confirming Compliance of provisions of Regulation 74(5) of SEBI (Depositories and Participa nts) Regulations, 2018 for the Quarter ended 30th September 2026.

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KFIN/CPCL/CDSL/74(5) E/1 Date: 02‐10‐2026 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 CHENNAI PETROLEUM CORPORATION 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.

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KFIN/CPCL/NSDL/74(5) E/1 Date: 02‐10‐2026 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 CHENNAI PETROLEUM CORPORATION 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.

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