Analysts/Institutional Investor Meet/Con. Call Updates

OIL AND NATURAL GAS CORPORATION LIMITED COMPANY SECRETARIAT ONGC/CS/SE/2026-27 02.11.2026 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 Equity: 500312 NCD: 959881 Sub: Intimation of Conference call with Analyst(s) & Investor(s) on Q2 FY’27 Financial Results Madam/ Sir, Pursuant to Regulation 30 read with Schedule III of SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, it is hereby informed that Mr. Anupam Agarwal, Director (Finance), Mr. Yogish Nayak S., Chief Corporate Finance, Dr. Ravinder Singh Negi, Chief – Treasury & Investor Relation & Team will be available on conference call scheduled on Friday, the 6th November, 2026 at 15:30 Hours to discuss Q2 FY’27 earnings. The conference call invite is attached herewith. 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 OIL AND NATURAL GAS CORPORATION LTD. INVITES YOU TO A CONFERENCE CALL TO DISCUSS Q2 FY’27 EARNINGS Represented by Mr. Anupam Agarwal, Director (Finance) Mr. Yogish Nayak S., Chief Corporate Finance, Dr. Ravinder Singh Negi, Chief – Treasury & Investor Relations & Team Friday, November 06, 2026 15:30 Hrs. IST (AT 10:00 AM UK TIME (GMT) | 06:00 PM HK/SINGAPORE TIME) (AT 05:00 AM US EASTERN TIME (EST)) Diamond Pass Registration (For Registered Participants) Click here to register: ONGC-Q2 FY’27 Pan India Access Number Dial in Access Numbers: 086 3416 8832 & 086 4536 7270 Toll Free Number – International USA: 1877 387 0849/1800 974 0768, UK: 0800 016 3439/0808 101 7155 Singapore: 800 101 1941, Hong Kong: 800 903 171 International Direct Toll Access: +91 44 7116 3030 ACCESS PIN only for international participants: 7126556# Call Co-ordinator: Mr. Mukesh Kumar – 011- 2675-3047, E-mail: irc@ongc.co.in Safe harbor: The proposed management discussion and comments thereof may include forward-looking statements. Forward-looking statements are statements that concern plans, objectives, goals, strategies, future events or performance and underlying assumptions and other statements that are other than statements of historical fact. All forward looking statements are subject to risks, uncertainties and assumptions that could cause actual results of operations and financial conditions to differ materially from those contemplated by the relevant statement. All Conference Call Participants should not place undue reliance on these forward-looking statements.