Intimation of closure of Trading Window for dealing in the securities of the Company shall remain closed for the Designated Persons and their immediate relatives with effect from 1st October, 2026 till 48 hours after the declaraion of Financial Results of the Company for the 2nd quarter and six months ended 30th September, 2026.

SIMPLEX INFRASTRUCTURES LIMITED REGD OFFICE AN ISO 9001 : 2015 'SIMPLEX HOUSE’ 27. SHAKESPEARE SARANI KOLKATA-700 017 (INDIAl PHONES +91 33 2301-1600. FAX *91 33 2289-1468 certified company E-mail simplexkolkata@simflexinfra.com, Website www.simplexinfra.com CIN No. L45209 WB 1924 PLC 004969 RefNo. 01/CS/SE/001/95675 Dale. 25th September, 2026 The Secretary The Secretary National Stock Exchange of India Limited The Calcutta Stock Exchange Ltd 5lh Floor, Exchange Plaza 7, Lyons Range Bandra Kurla Complex Kolkata-700 001 Bandra East, Mumbai - 400 051 The Secretary BSE Limited Ist Floor, New Trade Ring Rotunda Building Phiroze JeeJeebhoy Towers Dalal Street, Mumbai -400 001 Dear Sir, Sub: Closure of Trading Window This is to inform you that pursuant to SEBI (Prohibition of Insider Trading) Regulations, 2015, as amended, read with Company's Code of Conduct for Trading by Insiders in Securities of the Company, the trading window for dealing in the securities of the Company shall remain closed for the Designated Persons (and their immediate relatives) with effect from 01s1 October, 2026 till 48 hours after the declaration of Financial Results of the Company for the 2nd quarter and six months ended 30l11 September, 2026 You are requested to disseminate the above information on your respective websites. Thanking You, Yours faithfully. For Simplex Infrastructures Limited B.L.Bajoria SR. Vice President & Company Secretary BRANCHES: "HEMKUNTH" 4TH FLOOR. 89. NEHRU PLACE, NEW DELHI-110 019® : (011) 4944-4200, FAX (011)2646-5869 • HEAVITREE COMPLEX. 1ST FLOOR. UNIT-C, NEW DOOR NO 47. SPURTANK ROAD. CHETPET, CHENNAI-600 031 S : (044) 4287-6129