CSL signs Joint Venture Agreement with DDW. Please refer attachment for details.

SEC/48/2017-63 September 11, 2026 The Manager The Manager Compliance Department Compliance Department BSE Limited The National Stock Exchange of India Ltd. Phiroze Jeejeebhoy Tower Exchange Plaza Dalal Street Bandra – Kurla Complex, Bandra (East) Mumbai – 400 001 Mumbai – 400 051 Scrip Code/Symbol: 540678/COCHINSHIP Dear Sir/ Madam, Subject: Updates on the Joint Venture with Drydocks World Dubai – FZCO (DDW) 1. Further to our intimation dated September 09, 2026, regarding the proposed joint venture with Drydocks World Dubai – FZCO (DDW), a DP World Company, we wish to inform that the Company has executed the Joint Venture Agreement with DDW today. The Agreement was signed by Captain Rado Antolovic, PhD, CEO, DDW and Shri Jose V J, Chairman and Managing Director and Director (Finance), Cochin Shipyard Limited, on the sidelines of the BRICS Summit 2026 in New Delhi, in the presence of Shri Sarbananda Sonowal, Hon’ble Union Minister of Ports, Shipping and Waterways and H.E. Omran Sharaf Alhashimi, UAE Assistant Foreign Minister for Advanced Science and Technology. 2. The above is for your information and record please. Thanking you, For Cochin Shipyard Limited