Mazagon Dock Shipbuilders Limited has informed the Exchange regarding the Trading Window closure pursuant to SEBI (Prohibition of Insider Trading) Regulations, 2015.

12704102 MAKEININDIA n ~I$~Iig 4sTcp PI’iI~cns’e1 Mazagon Dock Shipbuilders Ltd. (Formerly Mazagon Dock Limited) (A Govt. ofIndia Undertaking) sTtgii q~j1flg~ ‘R4-400 010 Dockyard Road, Mazagon, Mumbai -400010 certified ISO 9001 company CIN : L35100MH1934G0I002079 Ref. No.: SEC/BSENSEDISCL/43/2026-27 Date: 24 September 2026 To To BSE Limited National Stock Exchange ofIndia Limited Phiroze Jeejeebhoy Towers Exchange Plaza, C-i, Block G Dalal Street Bandra Kurla Complex Mumbai -400001 Bandra (E), Mumbai -400051 Scrip Code: 543237 NSE Symbol: MAZDOCK Subject: Intimation of Closure of Trading Window under the SEll (Prohibition of Insider Trading) Regulations, 2015 for the quarter ending on 30 September 2026. Dear Sir! Madam, Please be informed that, pursuant to the Code ofConduct for Prohibition of Insider Trading in dealing with the securities ofMazagon Dock Shipbuilders Limited (Company) read with applicable provisions of the SEBI (Prohibition of Insider Trading) Regulations, 2015 as amended, the trading window for dealing in securities ofthe company by Designated Persons and their immediate relatives, shall remain closed with effect from 01 October 2026 till the end of48 hours after the declaration of the Financial Results ofthe company forthe quarter and period ending on 30 September 2026. The date of Board meeting for consideration of the Financial Results of the Company for the quarter and period ending on 30 September 2026 shall be intimated in due course. This is for your information and record. Thanking You, Yours Faithfully, For MAZAGON DOCK SFIIPBUILDERS LIMITED Lalatendu Acharya Company Secretary and Compliance officer FCS-6569 i~~p +91(22) 23762000 tn (Design) +91(22) 2373 8159 (Proj-C) +91(22) 2373 8147 a~tujc :https:llmazagofldOCk.ifl Phone+91(22) 2376 3000 Fax (Matèrial)+91(22)2373 8151 (EastYd.)+91(22) 2373 8333 Website : hftps:IImazagOfldOCk.~fl IRQS +91(22) 23764000 (Finance)+91(22) 2373 8338 ADEPARTMENTOF INDLN~RIOMIEROP mOPPING