Press Release

CS:01:100/26-27 22.10.2026 The Secretary, National Stock Exchange of India Limited BSE Ltd. Exchange Plaza, 5th Floor Phiroze Jeejeeboy Towers, Plot No. C/1, G-Block, 25th Floor, Dalal Street, Bandra Kurla Complex Mumbai — 400 001 Bandra (e) Mumbai — 400 051 BSE Scrip Code: 500110 NSE Trading Symbol: CHENNPETRO ISIN: INE178A01016 Dear Sir, Sub: Intimation under Regulation 30 of SEBI (Listing Obligations & Disclosure Requirements) Regulations, 2015 - Press Release - - - - - Please find attached copy of the press release made by the Company in respect of ‘CPCL Financial Performance for the quarter ended 30.09.2026’. This is for your information and record please. Thanking you, Yours Faithfully, For Chennai Petroleum Corporation Limited, Lalit Kumar Mohanty Company Secretary Encl.: a/a CPCL Financial Performance for the quarter ended 30.09.2026 Physical Performance CPCL delivered outstanding operational results during Q2 FY2026-27, achieving a crude throughput of 2.590 million metric tonnes (MMT) considering planned turnaround maintenance of one of the crude units during the current quarter. This translates to a capacity utilisation of 98%, highlighting the company’s operational efficiency and superior plant reliability. For the half year ended September 30, 2026, crude throughput stood at 5.438 MMT maintaining a capacity utilisation of 103%. Financial Performance The Company’s financial results for the quarter reflects outstanding operations and improved refining margins. For the quarter ended September 30, 2026, Revenue from Operations stood at ₹22,109 crore, compared to ₹20,069 crore in the corresponding period of last year. The Company reported a Profit Before Tax (PBT) of ₹3,032 crore and a Profit After Tax (PAT) of ₹2271 crore, as against a Profit Before Tax of ₹994 crore and Profit After Tax of ₹732 crore during the same quarter last year. For the half year ended September 30, 2026, Revenue from Operations stood at ₹51,486 crore, compared to ₹38,762 crore in the previous year. The Company reported a Profit Before Tax of ₹4397 crore and a Profit After Tax of ₹3288 crore, as compared to Profit Before Tax of ₹914 crore and Profit After Tax of ₹675 crore in the corresponding period of the previous financial year. The Gross Refining Margin (GRM) for the quarter showed a substantial improvement, rising to US$ 20.41 per barrel compared to US$ 9.04 per barrel in the corresponding quarter of the previous year. For the half year ended September 30, 2026, the GRM stood at US$ 14.34 per barrel, as compared to US$ 6.17 per barrel recorded during the same period last year. The Company declared an interim dividend of ₹25 per equity share of face value of Rs.10/- each for the financial year 2026–27, reflecting its strong financial performance and commitment to delivering sustained value to shareholders. On a consolidated basis, for the half year ended September 30, 2026, CPCL recorded a Profit After Tax of ₹3278 crore, as against a consolidated Profit After Tax of ₹694 crore in the corresponding period of the previous year. *****