DCI/CS/E.1/2023 31/03/2023 Listing Compliance National Stock Exchange of India Ltd. Exchange Plaza, C-1, Block-G, Bandra Kurla Complex, Bandra (E), Mumbai - 400051 Symbol: DREDGECORP Listing Compliance Bombay Stock Exchange Limited 1st Floor, Phiroze Jeejeebhoy Towers, Fort, Mumbai- 400001 Scrip code : 523618 The Secretary Calcutta Stock Exchange Assn. Ltd. 7, Lyons Range, Kolkata- 700001 Scrip Code : 14050 Dear Sir, SUB: CLOSING OF TRADING WINDOW We wish to inform you that pursuant to the SEBI (Prohibition of Insider Trading) Regulations and the DCI Code for prevention of insider trading of securities of the Company, the trading window of the company is closed from 01/04/2023 upto 48 hours after announcement of financial results for the quarter/year ended 31/03/2023. Yours faithfully, For Dredging Corporation of India Limited P.Chandra Kalabhinetri Company Secretary