Date:09/07/2025 To Bombay Stock Exchange Limited.

Dalal Street, Fort Mumbai -400 001. Sub.-: Submission of Confirmation Certificate in the matter of Regulation 74(5) of Securities and Exchange Board of India (Depositories and participants) Regulations, 2018 for the quarter ended 30th June, 2025. Ref. -: Scrip Code: 531471-ISIN: INE397GOl0l9 ================================================================ Dear Sir I Madam, With regards to the captioned subject please find enclosed herewith the certificate issued by Mfs.

Purva Sharegistry (India) Pvt. Ltd., Share Transfer Agentfor the quarter ended 30th June, 2025. Kindly take the same on your records and acknowledge the receipt.

Thanking you, Yours faithfully, For Duke Offshore Limited, 403, 4th Floor, Urvashi, Off.

Sayani Road, Prabhadevi, Mumbai -400 025. India.

Email: info@dukeoffshore.com CIN: L45209MH1985PLC038300 www.dukeoffshore.com ----------------Page (0) Break---------------- 01/07/2025 To, 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 quarter ended June, 2025, 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 Dhuri Compliance Officer. ----------------Page (1) Break----------------