Intimation regarding Closure of Trading Window under SEBI (PIT) Regulation 2015.

Date: 26/09/2026 To, To, National Stock Exchange of India Ltd., BSE Limited Exchange Plaza, C-1, Block G, Phiroze Jeejeebhoy Towers Bandra Kurla Complex, Bandra (E), Dalal Street Mumbai – 400 051 Mumbai- 400001 NSE Scrip Symbol: INTERARCH BSE Scrip Code 544232 Sub: Intimation regarding Closure of Trading Window under Insider Trading Code. Dear Sir/ Madam, Pursuant to the Code of Conduct for Regulation, Monitoring and Report Trading in securities of the Company by Insiders and Designated Persons and/or their immediate relatives read with the applicable provisions of the Securities and Exchange Board of India (Prohibition of Insider Trading) Regulations, 2015, this is to inform you that the Trading Window for dealing in the Equity Shares of Interarch Building Solutions Limited (“the Company”) will remain closed from Thursday, October 1, 2026 till 48 hours after the declaration of the Un-Audited Standalone Financial Results of the Company for the quarter & half year ending on September 30, 2026. The date of Board Meeting, inter-alia, to consider said un-audited Standalone Financial Results will be informed separately. We would request you to kindly take the above mentioned information on your record. Thanking You, For INTERARCH BUILDING SOLUTIONS LIMITED (formerly Interarch Building Products Limited) ARVIND NANDA MANAGING DIRECTOR DIN: 00149426 INTERARCH BUILDING SOLUTIONS LIMITED (Formerly known as Interarch Building Products Limited) Corporate Office : B-30, Sector 57, Noida - 201301, India. Tel.: +91 120 4170200, CIN: L45201DL1983PLC017029, GST No.09AAACI0106J1ZY Registered Office: Farm No-8, Khasra No. 56/23/2, Dera Mandi Road, Mandi Village, Tehsil Mehrauli, New Delhi - 110047, India.