Closure of Trading Window

Ref.: NSE, BSE, CSE/OMDC/CS/10-2026/01 Dated: 05.10.2026 To, To To The Compliance Department The Compliance The Secretary National Stock Exchange of India Department The Calcutta Stock Limited Department of Corporate Exchange Exchange Plaza, Plot No. C/1, Services 7, Lyons Range Block —G, Bandra kurla Bombay Stock Exchange Kolkata-700001 Complex, Bandra(E),Mumbai- Limited 400051 1st Floor, Phiroze Jee, Jeebhoy Tower, Bombay Samachar Marg, Mumbai- 400001 SCRIPT CODE: ORISSAMINE SCRIPTCODE: 590086 SCRIPTCODE: 25058 Dear Sir/Madam, Sub: Closure of Trading Window We wish to inform you that, pursuant to the provisions of the Securities and Exchange Board of India (Prohibition of Insider Trading) Regulations, 2015 and the Company’s Code of Conduct for prevention of insider trading, the Trading Window for dealing in the securities of the Company will be closed from 1st October, 2026 till 48 (forty-eight) hours after the declaration of the unaudited Financial Results (Standalone) of the Company, for the quarter ended on 30th September, 2026. The date of the Board Meeting, inter alia, for considering the unaudited Financial Results (Standalone) of the Company, for the quarter ended on 30th September, 2026 will be intimated in due course. We request that the above information may please be taken on record. Thanking you, Yours faithfully, For The Orissa Minerals Development Company Limited Pintu Ku. Biswal Company Secretary