Major companies in the energy sector said they are rectifying problems found during inspections

More than 40 officials in the State-run China National Offshore Oil Corp have quit their jobs in the last decade and used their connections to improve the profitability of their own firms, according to the Central Commission for Discipline Inspection.

China's top anti-graft authority published the finding on its website on Monday after completing inspection tours at 25 major State-own enterprises.