Notice for Trading window closure for the Un-audited financial results for 2nd Quarter/half year ended September 30, 2026.

MANGALORE REFINERY AND PETROCHEMICALS LIMITED (ऑयलweeगैस कॉरपोरेशन लिमिटेड की सहायक कंपनी A SUBSIDIARY OF OIL AND NATURAL GAS CORPORATION LIMITED) ,.एस.ओ. 9001, 14001 एवं 50001 प्रमाणित कंपनी AN ISO 9001, 14001 AND 50001 CERTIFIED COMPANY सीआईएन / CIN : L19200KA1988G01008959 , Website : www.nrpl.co.in 23/09/2026 The Assistant General Manager, The Compliance & Listing Department Listing Compliance, BSE Limited National Stock Exchange of India Limited Scrip Code: 500109, Symbol: MRPL, Series: EQ, ISIN: INE103A01014 ISIN: INE103A01014 है Scrip Code (Debenture): 959162, 959250, Debt Security: INE103A08019, INE103A08035, 973692 INE103A08050 हि Dear Sir/Madam, Subject: Notice for closure of Trading Window. Pursuant to the provisions of SEBI (Prohibition of Insider Trading), Regulations, 2015, and amendment thereto ("Regulations") and the Code of Internal Procedures and Conduct for Prohibition of Insider Trading in dealing with the securities of MRPL, the "Trading Window" for dealing in shares of MRPL, shall remain closed as follows: Sl. Event Closure From Closure Till | Un-audited Financial Results for the October 01, 2026 | Till 48 hours after the conclusion 27 Quarter/ Half year ended of the Board Meeting in which September 30, 2026. the Un-audited Financial Results will be approved. The date of the Board meeting to be convened for consideration and approval of Un-audited Financial Results for the 274 Quarter/ Half year ended September 30, 2026, will be intimated in due course. This is for information and record. Thanking you, Yours faithfully, For Mangalore Refinery and Petrochemicals Limited Premachandra Rao G Company Secretary Mawr Read, Office: Kuthethoor P.O. Via Katipalla, Manaaluru - 575 030 (India)