CONFIRMATION CERTIFICATE UNDER REGULATION 74(5) OF SEBI (DEPOSITORIES AND PARTICIPANTS) REGULATIONS 2018 FOR THE QUARTER AND HALF YEAR ENDED 30TH SEPTEMBER, 2026

4 ’) DUKE OFFSHORE LIMITED 13t October, 2026 Department of Corporate Services BSE Limited Phiroze Jee Jee Bhoy Towers Dalal Street Mumbai - 400 001. Dear Sir /Madam Scrip Code: BSE: 531471 | ISIN: INE397G01019 Subject: Confirmation Certificate under Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018. We herewith enclose the certificate issued by our registrar and share transfer agent M/s. Purva Sharegistry (India) Private Limited as per Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018 for the Quarter ended 30t September, 2026 for your information and records. Thanking you Yours Faithfully For Duke Offshore Limited Ashutosh Janak Kumar Thakar Whole Time Director DIN: 10251729 DUKE OFFSHORE LIMITED CIN: L45209MH1985PLC038300 REGISTERED OFFICE: 3A, 3 Floor, Mansionz One, Plot No 260 265, Linking Road, Bandra (W), Shopper Stop, Mumbai- 400050. CONTACT DETAILS: Email: info@dukeoffshore.com | Website: www.dukeofshore.com PURVA SHAREGISTRY (I) PVT. LTD. (SEBI Regn. INR000001112 Category 1 Registrars to IPO & Share Transfer Agents) GST No. 27AAACP4924D1ZO * CIN No. U67120MH1993PTC074079 9 Shiv Shakti Industrial Estate, J. R. Boricha Marg, Near Lodha Excelus, Lower Parel East, Mumbai - 400 011 Tel :022:3199 8810/ 4961 4132+ Email: support@purvashare.com * Web : www.purvashare.com 01/10/2026 DUKE OFFSHORE LIMITED - INE397G01019 Dear Sir/Madam. Sub : Confirmation Certificate under Regulation 74(5) of Securities and Exchange Board of India (Depositories and Participants) Regulations, 2018 As per Regulation 74(5) of Securities and Exchange Board of India (Depositories and Participants) Regulations, 2018, we hereby confirm that security received from the depository participants for dematerialisation during the month ended September, 2026, were confirmed (accepted / rejected) to the depositories by us and that securities comprised in the said certificates have been listed on the stock exchanges where the earlier issued securities are listed. We hereby also confirm that the security certificates received for dematerialisation have been confirmed/rejected and the security certificates received were mutilated and cancelled after due verification by the depository participant and the name of the depositories have been substituted in the register of members as the registered owner within the prescribed timelines. We request you to kindly take note of the above in your records. Thanking you, Yours faithfully, For Purva Sharegistry (India) Pvt. Ltd. Ms. Deepali Gaonkar Compliance Officer.