Change in Company Secretary/Compliance Officer

CS:01:100/26-27 26.06.2026 The Secretary, National Stock Exchange of India Limited BSE Ltd. Exchange Plaza, 5th Floor Phiroze Jeejeeboy Towers, Plot No.C/1, G-Block, 25th Floor, Dalal Street, Bandra Kurla Complex Mumbai — 400 001 Bandra (e) Mumbai — 400 051 BSE Scrip Code: 500110 NSE Trading Symbol: CHENNPETRO ISIN: INE178A01016 Dear Sir, Sub: Change in Company Secretary & Compliance Officer Pursuant to the requirements of Regulation 30 of SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 ("SEBI LODR") it is hereby informed that Shri P Shankar, Company Secretary & Compliance Officer will be superannuating from the services of the Company with effect from June 30,2026 at the close of business hours. Further, the Board of CPCL at its meeting held on June 26, 2026, has approved the appointment of Shri Lalit Kumar Mohanty (Membership No.: F6655) as Company Secretary & Compliance Officer with effect from July 01, 2026. A brief profile of Shri Lalit Kumar Mohanty is enclosed. The meeting of the Board of Directors commenced at 10:00 AM and concluded at 11:40 AM Thanking you, Yours faithfully, for Chennai Petroleum Corporation Limited P. Shankar Company Secretary ANNEXURE Details required as per SEBI Circular No SEBI/HO/CFD/CFD/PoD2/CIR/P/0155 dated November 11, 2024 Sr. No. Details of events that need to be provided Information of such event(s) 1. Reason for Change viz. appointment, Appointment of Shri Lalit Kumar Mohanty as resignation, removal, death or otherwise Company Secretary & Compliance Officer 2. Date of Appointment/Cessation w.e.f 01st July 2026 3. Brief profile Shri Lalit Kumar Mohanty is a Science graduate and a qualified Company Secretary from the Institute of Company Secretaries of India (Membership No.: F6655) and holds a Master’s degree in Law. He has been serving as the Deputy Company Secretary of the Company since 2020 and brings with him over 25 years of rich and diverse experience in the areas of secretarial, legal, and taxation functions across various industries including telecom, refractories, steel, and oil sectors. Prior to joining the Company, he held the position of Company Secretary at Neelachal Ispat Nigam Limited, a Central Public Sector Undertaking. During his professional career, he has also been associated with reputed organizations such as Tata Refractories Limited, RPG Group of Companies, and Ortel Communications Limited. 4. Disclosure of relationships between Not applicable directors (in case of appointment of a director)