Indian Oil Corporation, Oil and Natural Gas Corporation (ONGC) and NTPC emerged as the top three most profitable Public Sector Undertakings (PSUs) in 2017-18. The companies contributed 13.37%, 12.49% and 6.48% respectively to the total profit earned by Central Public Sector Enterprises (CPSEs) during the period. BSNL, Air India and MTNL incurred the highest losses for the second consecutive year.