Stock exchanges BSE and NSE have slapped fines on oil refining and fuel marketing giants Indian Oil Corporation (IOC), Hindustan Petroleum Corporation Ltd (HPCL) and Bharat Petroleum Corporation Ltd (BPCL), explorer Oil India Ltd (OIL), gas utility GAIL (India) Ltd, and refiner Mangalore Refinery and Petrochemicals Ltd (MRPL) for not meeting the listing requirement in the April-June quarter.