ONGC has many matured fields with a current recovery factor of 25–33%.[1] Its Reserve Replacement Ratio for between 2005 and 2013, has been more than one.[5] During FY 2012–13, ONGC had to share the highest ever under-recovery of INR 89765.78 billion (an increase of INR 17889.89 million over the previous financial year) towards the under-recoveries of Oil Marketing Companies (IOC, BPCL and HPCL).[5] On 1 November 2017, the Union Cabinet approved ONGC for acquiring majority 51.11% stake in HPCL (Hindustan Petroleum Corporation Limited). On Jan 30th 2018, Oil & Natural Gas Corporation acquired the entire 51.11% stake of Hindustan Petroleum Corporation.[8]