Credit Rating- Revision

CS:01:100/26-27 14th September 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 of Credit Rating under Regulations 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations 2015 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. ICRA Ratings Ltd, vide its letter dated 14th September, 2026, has reaffirmed the credit ratings assigned to the Company’s Commercial paper instrument. The re-affirmed ratings are as below. Instrument* Previous rated Current rated Rating action Financial Sector amount (Rs. crore) amount (Rs. crore) Regulator# Commercial 7500.0 7500.0 [ICRA]A1+; RBI paper reaffirmed Total 7500.0 7500.0 The above is 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