The Indian Energy Exchange (IEX) has sold 4.93 per cent of its stake in the India Gas Exchange (IGX) to Indian Oil Corporation Limited (IOCL). The IEX and the National Stock Exchange are promoters of the IGX, a gas exchange set up to encourage gas trading in India. Gas Authority of India Limited, the Oil and Natural Gas Corporation (ONGC), Torrent Gas Limited and Adani Total Gas Limited are other strategic investors in the gas exchange.