Certificate under SEBI (Depositories and Participants) Regulations, 2018

July 09, 2026 To, To, The Manager The Manager Listing Department Corporate Relationship Department National Stock Exchange of India Limited BSE Limited Exchange Plaza, Plot No. C/1, G Block Floor 25, Phiroze Jeejeebhoy Towers, Bandra Kurla Complex Dalal Street, Bandra (East), Mumbai - 400 001 Mumbai - 400 051 BSE Scrip Code - 544264 NSE Symbol: DIFFNKG Subject: Certificate under Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018 for the quarter ended June 30, 2026 Dear Sir/Madam, In compliance with Regulation 74(5) of SEBI (Depositories and Participants) Regulations, 2018, we are enclosing herewith a copy of the Certificate received from Bigshare Services Pvt. Ltd., Registrar and Transfer Agent of the Company, dated July 06, 2026 for the quarter ended June 30, 2026. Kindly take the same on your record. Thanking You, Yours faithfully, For Diffusion Engineers Limited Chanchal Jaiswal Company Secretary and Compliance Officer ICSI Membership No.: A67136 Encl.: A/a Bigshare Services Pvt. Ltd. Ref No. BSS/Reg 74(5)/2026 Date: 06/07/2026 DIFFUSION ENGINEERS LIMITED INE184O01015 T-5&6 MIDC HINGNA INDUSTRIAL AREA NAGPUR NAGPUR - 440016 Sub: Certificate under Regulation 74(5) of the SEBI (Depositories and Participants) Regulations, 2018 for the quarter ended 30th June 2026. Dear Sir, In reference to above - captioned Regulation, we hereby confirm that no dematerialization request for equity shares of your company were received during the period from 01.04.2026 to 30.06.2026. We request you to kindly take note of the above in your records. Thanking you, Yours faithfully, For Bigshare Services Pvt. Ltd., Sandeep More Authorised Signatory CIN : U99999MH1994PTC076534 Regd. Office: Office No S6-2, 6th Floor, Pinnacle Business Park,Next to Ahura Centre, Mahakali Caves Road, Andheri (East) Mumbai - 400 093. Tel. : +9122 6263 8200 • Fax : +9122 6263 8299 • Email : info@bigshareonline.com • Website : www.bigshareonline.com