Diffusion Engineers Limited — Regulatory Filings 2025

Nov 15, 2025

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Date: November 15, 2025

To, The Manager Listing Department National Stock Exchange of India Limited Exchange Plaza, Bandra Kurla Complex Bandra (East), Mumbai - 400 051 NSE Symbol: DIFFNKG

To, The Manager Corporate Relationship Department BSE Limited Floor 25, Phiroze Jeejeebhoy Towers, Dalal Street, Mumbai - 400 001 BSE Scrip Code - 544264

Dear Sir/Madam,

Sub‐: Submission of copy of Newspaper Advertisement published on November 15, 2025 pursuant to Regulation 47 of SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015

This is to inform you that the Board of Directors of the Company in its meeting held on Friday, November 14, 2025 has approved the Unaudited Financial Results (Standalone and Consolidated) of the Company for the quarter and half year ended September 30, 2025. In this regard and pursuant to the provisions of Regulation 47 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, we herein enclose the copy of the Newspaper Advertisement dated November 15, 2025 published in the following newspapers:

1. The Indian Express (English Newspaper)

2. Loksatta (Marathi Newspaper)

You are requested to take the above information on your records.

Thanking You. Yours faithfully, For Diffusion Engineers Limited

Chanchal Digitally signed by Chanchal Rajesh Rajesh Jaiswal Jaiswal Date: 2025.11.15 15:22:57 +05'30'

Chanchal Jaiswal Company Secretary and Compliance officer Membership no. A67136

Encl: A/a

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