Diffusion Engineers Limited — Regulatory Filings 2026

Apr 7, 2026

==> picture [587 x 66] intentionally omitted <==

April 07, 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 March 31, 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 April 06, 2026 for the quarter ended March 31, 2026.

Kindly take the same on your record.

Thanking You,

Yours faithfully,

For Diffusion Engineers Limited

Chanchal Digitally signed by Chanchal Rajesh Rajesh Jaiswal Jaiswal Date: 2026.04.07 13:09:09 +05'30' Chanchal Jaiswal Company Secretary and Compliance Officer ICSI Membership No.: A67136

Encl.: A/a

==> picture [573 x 101] intentionally omitted <==

==> picture [37 x 48] intentionally omitted <==

Bigshare Services Pvt. Ltd.

Ref No. BSS/Reg 74(5)/2026

Date: 06/04/2026

DIFFUSION ENGINEERS LIMITED INE184O01015 T-5&6 MIDC HINGNA INDUSTRIAL AREA NAGPUR NAGPUR - 440016

Dear Sir/Madam,

Sub: Certificate under Regulation 74(5) of the SEBI (Depositories and Participants) Regulations, 2018 for the quarter ended 31st March 2026.

Ref: NSDL/CIR/II/5/2019 dated 25th January 2019 DSL/OPS/RTA/POLICY/2019/14 dated 25th January 2019. SEBI vide its letter ref no. MRD/DOP2/DSA2/OW/2019/2498/1 dated 24/01/2019

In reference to the above – captioned regulation we hereby confirm that the securities received from the depository Participants for dematerialization up to 31st March 2026, were confirmed (accepted/rejected) to the depositories by us and that securities comprised in the said certificates have been listed on the stock exchange where the earlier issued securities are listed.

We hereby confirm that the security certificates received for dematerialization have been mutilated & cancelled after due verification by the depository Participant and the name of the depositories have been substituted in register of members as registered owner within 15 days of receipt of certificate of securities.

We request you to kindly take note of the above in your records.

Thanking you,

Yours faithfully,

For Bigshare Services Pvt. Ltd.,

==> picture [85 x 36] intentionally omitted <==

Akash Shamal 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