Intimation of Credit Rating assigned by Credit rating agency (CRISIL) dated 06.11.2026

CS:01:100/26-27 06th November, 2026 BSE Ltd. National Stock Exchange of India Limited Phiroze Jeejeeboy Towers Exchange Plaza, 5th Floor 25th Floor, Dalal Street Plot No.C/1, G-Block Mumbai – 400 001 Bandra Kurla Complex, Bandra (E) Mumbai – 400 051 BSE Scrip Code: 500110 NSE Trading Symbol: CHENNPETRO ISIN: INE178A01016 Dear Sir, SUB: INTIMATION FOR CREDIT RATING ASSIGNED BY CREDIT RATING AGENCIES In accordance with the Regulation 30 read with Part A of Schedule III of SEBI (Listing Obligations and Disclosure Requirements) Regulations 2015, we would like to inform that the Credit Rating Agency, viz. Crisil Ratings has reaffirmed its ‘Crisil AAA/Stable & Crisil A1+’ ratings on the bank facilities and commercial paper. The updated credit rating list is attached herewith and the same has also been hosted on the website of the Company https://www.cpcl.co.in/investors/share-holder-information/credit- rating/. The above is for your information and record please. Thanking you, Yours faithfully, for Chennai Petroleum Corporation Limited Lalit Kumar Mohanty Company Secretary Credit Ratings assigned to Chennai Petroleum Corporation Limited for various debt instruments by Rating agencies are given below: Amount Facility Name of Lender Rating (Rs.Crore) Bank Guarantee 25 IndusInd Bank Limited Crisil A1+ Cash Credit& 3000 State Bank of India Crisil AAA/Stable Fund-Based Facilities 600 ICICI Bank Limited Crisil AAA/Stable Fund-Based Facilities 700 HDFC Bank Limited Crisil AAA/Stable Fund-Based Facilities 500 Punjab National Bank Crisil AAA/Stable Fund-Based Facilities 1000 Bank Of India Crisil AAA/Stable Fund-Based Facilities 475 IndusInd Bank Limited Crisil AAA/Stable Fund-Based Facilities 450 The Federal Bank Limited Crisil AAA/Stable Fund-Based Facilities 750 YES Bank Limited Crisil AAA/Stable The South Indian Bank Fund-Based Facilities 300 Crisil AAA/Stable Limited Letter of credit & Bank 184 State Bank of India Crisil A1+ Guarantee Proposed Long Term 0.9 Not Applicable Crisil AAA/Stable Bank Loan Facility & - Full interchangeability with packing credit