LETTER ATTACHED

MAHANAGAR TELEPHONE NIGAM LIMITED (A GOVERNMENT OF INDIA ENTERPRISE) CIN L32101DL1986GOI023501 Registered and Corporate Office: Mahanagar Doorsanchar Sadan 5th Floor, 9 CGO Complex, Lodhi Road, New Delhi - 110 003. Tel: 011-24319020, Fax: 011-24324243, Website: www.mtnl.in, Email: mtnlcsco@gmail.com MTNL/SECTT/SE/2026 August 19, 2026 To, To, BSE Limited, National Stock Exchange of India Limited (NSE) Phiroze Jeejeebhoy Towers, Dalal Street, Exchange Plaza, Plot No. C/1, G Block Bandra Fort, Mumbai – 400 001. Kurla Complex, Bandra (East), Mumbai – 400 051 Scrip Code: 500108 Scrip Symbol: MTNL SUB: COMPLIANCE OF REGULATION 30 & 51 OF SEBI (LODR) REGULATIONS, 2015 - DISCLOSURE OF EVENTS OR INFORMATION – RATING GIVEN BY M/S INDIA RATINGS AND RESEARCH PVT LTD TO BONDS ISSUED BY MTNL – SUBMISSION OF PRESS RELEASE - reg Dear Sir, In compliance of Regulation 30 & 51 of SEBI (LODR) Regulations, 2015, this is to inform you that M/s India Ratings and Research Pvt Ltd has given its Press Release on Rating of Bonds Issued by MTNL dated August 18, 2026. Copy of aforesaid Press Release is attached herewith. Kindly take the same on record. Thanking You Yours Faithfully, (RATAN MANI SUMIT) COMPANY SECRETARY