Newspaper Publications: Addendum to Notice of 33rd Annual General Meeting

OIL AND NATURAL GAS CORPORATION LIMITED COMPANY SECRETARIAT ONGC/CS/SE/2026-27 21.08.2026 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 – 400 051 Mumbai – 400 001 Symbol-ONGC; Series – EQ BSE Security Code No.- 500312 NCD: 959881 Sub: Newspaper Publications: Addendum to Notice of 33rd Annual General Meeting Madam/Sir, Pursuant to the Regulation 30 and 47 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, please find enclosed copy of public notice published on 21.08.2026 in “Financial Express’’ in English language and ‘’Jansatta’’ in Hindi language (All India Editions) regarding “Addendum to Notice of 33rd Annual General Meeting” of the Company. This is for your information and record, please. Thanking You, Yours Sincerely, For Oil and Natural Gas Corporation Ltd. (Shashi Bhushan Singh) Company Secretary & Compliance Officer Encl: As above Regd. Office: Plot No 5A-5B, Nelson Mandela Marg, Vasant Kunj, New Delhi-110070 Phone: 011-2675 4073, 011-2675 4085 EPABX: 2675 0111, 2629000 CIN: L74899DL1993GOI054155 Website: www.ongcindia.com Email: secretariat@ongc.co.in