Credit Rating

Date: September 23, 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 Dear Sir/Madam, Subject‐: Intimation about Credit Rating under the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 Pursuant to Regulation 30(6) read with Schedule III of the SEBI (Listing Obligations and Disclosure Requirements), Regulations, 2015 (the “Regulations”), we hereby inform you of the credit ratings assigned by Crisil Ratings Limited for the bank-based facilities of the Company. The details of the ratings are as follows: Total Bank Loan Facilities Rated Rs. 85 Crore (enhanced from Rs. 75 Crore) Long Term Rating Crisil A-/Stable (Reaffirmed) Short Term Rating Crisil A2+ (Reaffirmed) The rating letter issued by Crisil Ratings Limited is enclosed for your reference. The said intimation shall be available on website of the company at https://www.diffusionengineers.com/investors-relation Kindly take the above information on record. Thanking You, For Diffusion Engineers Limited Chanchal Jaiswal Company Secretary and Compliance Officer ICSI Membership No.: A67136 Enclosed: as above CONFIDENTIAL RL/GDS4651/405109/BLR/0926/159506 September 22, 2026 Mr. Abhishek Mehta Chief Financial Officer Diffusion Engineers Limited N-78 & 79, Midc, Industrial Area, Hingna, Nagpur, Nildoh ct, Nagpur - 440016 9661093637 Dear Mr. Abhishek Mehta, Re: Review of Crisil Ratings on the bank facilities of Diffusion Engineers Limited All ratings assigned by Crisil Ratings are kept under continuous surveillance and review. Please find in the table below the ratings outstanding for the debt instruments/facilities of the company, and the rating actions by Crisil Ratings on the ratings as on date. Total Bank Loan Facilities Rated Rs.85 Crore (Enhanced from Rs.75 Crore) Long Term Rating Crisil A-/Stable (Reaffirmed) Short Term Rating Crisil A2+ (Reaffirmed) (Bank-wise details as per Annexure 1) As per our Rating Agreement, Crisil Ratings would disseminate the ratings, along with the outlook, through its publications and other media, and keep the ratings, along with the outlook, under surveillance over the life of the instrument/facility. Crisil Ratings reserves the right to withdraw, or revise the ratings, along with the outlook, at any time, on the basis of new information, or unavailability of information, or other circumstances which Crisil Ratings believes may have an impact on the ratings. Please visit www.crisilratings.com and search with the name of the rated entity to access the latest rating/s. In the event of the company not availing the proposed facilities within a period of 180 days from the date of this letter, a fresh letter of revalidation from Crisil Ratings will be necessary. Crisil Ratings products / activities or ratings of instruments other than securities that are listed or proposed to be listed may fall under the purview of financial sector regulators (FSRs) other than SEBI. In respect of such products / activities or ratings (under the purview of other FSRs such as Reserve Bank of India (RBI), Ministry of Corporate Affairs (MCA), Insurance Regulatory and Development Authority of India (IRDAI), among others), the grievance / dispute redressal and investor protection mechanisms available under SEBI regulations shall not be applicable. A list of products/activities or ratings of instruments falling under the purview of various FSRs along with the names of respective FSRs has been duly disclosed by Crisil Ratings on its website. A link to the same has been provided below for ready reference: https://www.crisilratings.com/en/home/our-business/ratings/regulatory-disclosures/list-of-activities-instruments-and- names-of-regulators.html This letter will remain valid till March 31, 2027. After this date, please insist for a new rating letter (dated later than March 31, 2027). Should you require any clarification, please feel free to get in touch with us. With warm regards, Yours sincerely, Disclaimer: A rating by Crisil Ratings reflects Crisil Ratings’ current opinion on the likelihood of timely payment of the obligations under the rated instrument, and does not constitute an audit of the rated entity by Crisil Ratings. Our ratings are based on information provided by the issuer or obtained by Crisil Ratings from sources it considers reliable. Crisil Ratings does not guarantee the completeness or accuracy of the information on which the rating is based. A rating by Crisil Ratings is not a recommendation to buy / sell or hold the rated instrument; it does not comment on the market price or suitability for a particular investor. Crisil Ratings has a practice of keeping all its ratings under surveillance and ratings are revised as and when circumstances so warrant. Crisil Ratings is not responsible for any errors and especially states that it has no financial liability whatsoever to the subscribers / users / transmitters / distributors of its ratings. Crisil Ratings’ criteria are available without charge to the public on the web site, www.crisilratings.com. Crisil Ratings or its associates may have other commercial transactions with the company/entity. For the latest rating information on any instrument of any company rated by Crisil Ratings, please visit www.crisilratings.com or contact Customer Service Helpdesk at Crisilratingdesk@crisil.com or at 1800-267-3850 Shalaka Singh Nivedita Shibu Associate Director - Crisil Ratings Director - Crisil Ratings Annexure 1 - Bank-wise details of various facility classes (outstanding facilities) Amount (Rs. S.No. Bank Facility Bank Outstanding Rating in Crore) 1 Bank Guarantee ICICI Bank Limited 11 Crisil A2+ 2 Bank Guarantee HDFC Bank Limited 10 Crisil A2+ 3 Cash Credit HDFC Bank Limited 20 Crisil A-/Stable 4 Cash Credit ICICI Bank Limited 9 Crisil A-/Stable 5 Cash Credit YES Bank Limited 5 Crisil A-/Stable 6 Cash Credit DBS Bank Limited 15 Crisil A-/Stable 7 Letter of Credit HDFC Bank Limited 5 Crisil A2+ Working Capital Demand 8 Shinhan Bank 10 Crisil A-/Stable Loan Total 85 Disclaimer: A rating by Crisil Ratings reflects Crisil Ratings’ current opinion on the likelihood of timely payment of the obligations under the rated instrument, and does not constitute an audit of the rated entity by Crisil Ratings. Our ratings are based on information provided by the issuer or obtained by Crisil Ratings from sources it considers reliable. Crisil Ratings does not guarantee the completeness or accuracy of the information on which the rating is based. A rating by Crisil Ratings is not a recommendation to buy / sell or hold the rated instrument; it does not comment on the market price or suitability for a particular investor. Crisil Ratings has a practice of keeping all its ratings under surveillance and ratings are revised as and when circumstances so warrant. Crisil Ratings is not responsible for any errors and especially states that it has no financial liability whatsoever to the subscribers / users / transmitters / distributors of its ratings. Crisil Ratings’ criteria are available without charge to the public on the web site, www.crisilratings.com. Crisil Ratings or its associates may have other commercial transactions with the company/entity. For the latest rating information on any instrument of any company rated by Crisil Ratings, please visit www.crisilratings.com or contact Customer Service Helpdesk at Crisilratingdesk@crisil.com or at 1800-267-3850 Annexure: List of instruments and names of regulators of the instruments As required by SEBI CRA Circular dated Feb 10, 2026, a list of activities or instruments falling under the purview of various FSRs, along with the names of respective FSRs, is being disclosed below: A. Rating activities Sr. [Showing first 8,000 characters — download PDF for full document]