Trading Window

GSPL TRANSMISSION LIMITED Regd. Office: GTL Bhavan, E-18, GIDC Electronics Estate, Nr. K-7 Circle, Sector-26, Gandhinagar - 382028, Gujarat, India Tel : +91-79-23268500/600 Ref: GTL/S&L/2026-27 Website: www.gspltrans.com Date: September, 2026 To To The Manager (Listing) The Manager (Listing) The BSE Limited, The National Stock Exchange of India Ltd. Phiroze Jeejeebhoy Towers, "Exchange Plaza", Bandra-Kurla Dalal Street, Mumbai -- 400 001 Complex, Bandra (E), Mumbai - 400 051 Scrip Code: 544801 Company Symbol: GSPL TRANS Dear Sir/ Madam, Sub: Closure of Trading Window - Pursuant to GTL's Code of Conduct for Regulating, Monitoring and Reporting of Trading by Designated Person(s). Pursuant to the SEBI (Prohibition of Insider Trading) Regulations, 2015 and as per the GTL's Code of Conduct for Regulating, Monitoring and Reporting of Trading by Designated Person(s) ("the Company's Code"), we hereby inform that the Trading Window (closure period for dealing in the Company's Equity Shares) will remain closed from 1s October, 2026 for all the Designated Person(s) and their Immediate Relatives, as defined under the Company's Code. Further, the Trading Window will open upon expiry of 48 hours after the announcement/ declaration to the stock exchanges by the Company of the Financial Results for the Quarter ended September, 2026, to be considered by the Board of Directors of the Company. The date of Board Meeting shall be intimated separately. We request you to kindly take the above on record. Thanking you, Yours faithfully, For GSPL Transmission Limited, Rajeshwari Sharma Company Secretary CIN: U49300GJ2024SGC153672