General Updates

OIL AND NATURAL GAS CORPORATION LIMITED COMPANY SECRETARIAT ONGC/CS/SE/2026-27 10.09.2026 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 Equity: 500312 NCD: 959881 Sub: Intimation regarding ESG Rating Madam/Sir, Pursuant to Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, it is hereby informed that the Company has received “ESG Rating Report” issued by ESG Risk Assessments & Insights Limited (ESGRisk.ai) attached at Annexure A. It is informed that the Company has neither engaged the above-mentioned agency for preparation of the said Report nor the report has been finalised in consultation with the Company. The overall score of 44 provided to the Company is low and not commensurate with its efforts in respect of decarbonization initiatives & governance structure, as well as detailed disclosures made in Business Responsibility and Sustainability Report (BRSR). 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 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 Annexure-A