IOCL is India’s largest oil company and one of the main company in the fortune 500. It has various products such as Oil, Natural gas, Petroleum, Lubricants and fuel. It is one of the biggest public sector company which has the prominent market share. Indian oil has subsidiaries more than 46% share in petroleum products, refining holds 40% share in the market, out of 21 refineries in India Indian oil holds 10 refineries. and the downstream operation has 65%market share In the year 1964 growth of Indian