Certificate under SEBI (Depositories and Participants) Regulations, 2018

OIL AND NATURAL GAS CORPORATION LIMITED COMPANY SECRETARIAT ONGC/CS/SE/2026-27 03.07.2026 National Stock Exchange of India Ltd. BSE Limited Listing Department Corporate Relationship Department Exchange Plaza Phiroze Jeejeebhoy Towers Bandra-Kurla Complex, Bandra (E) Dalal Street, Fort Mumbai – 400051 Mumbai – 400001 Symbol-ONGC; Series - EQ BSE Security Code No.- 500312 National Securities Depository Ltd. Central Depository Services (India) Limited 3rd Floor, Naman Chamber, Plot C-32, Marathon Futurex, A-Wing, G-Block, Bandra Kurla Complex, Bandra East, 25th floor, NM Joshi Marg, Mumbai- 400051 Lower Parel, Mumbai-400013 Sub: Compliance Certificate under Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018 for the quarter ended 30th June, 2026. Madam/Sir, The certificate received from Alankit Assignments Limited, Registrar & Share Transfer Agent of the Company, confirming compliance with the provisions of Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018 for the quarter ended 30th June, 2026 is enclosed. This is for your information and records, please. Thanking you, Yours Sincerely, For Oil and Natural Gas Corporation Ltd. (Shashi Bhushan Singh) Company Secretary & Compliance Officer Regd. office: Plot No 5A-5B, Nelson Mandela Road, Vasant Kunj, New Delhi-110070 Phone: 011-26754085, 011-26754073, CIN: L74899DL1993GOI054155 Website: www.ongcindia.com, Email: secretariat@ongc.co.in 1st July, 2026 The Company Secretary Oil & Natural Gas Corporation Ltd. Deendayal Urja Bhawan 5 Nelson Mandela Marg Vasant Kunj New Delhi – 110070 Subject : Certificate under Regulation 74(5) of the SEBI ( Depository and participants ) Regulations, 2018 for the quarter ended 30th June, 2026. Dear Sir, In accordance with Regulation 74(5) of the SEBI (Depositories and Participants) Regulations, 2018 for the quarter ended 30th June, 2026, w.r.t. physical share certificates received for dematerialization of securities (Equity Shares) of the Company, “Oil & Natural Gas Corporation Ltd..” we hereby confirm and certify the following: a) The securities comprised in the said certificate(s) have been listed on the Stock Exchanges : and b) The said certificate(s) after due verification have been mutilated and cancelled and the name of depository has been substituted in our records as registered owner. This is for your information and records. Thanking You, For ALANKIT ASSIGNMENTS LIMITED Kamal Garg (General Manager)