The probe agency has charged Grace Industries and Vikash Metals and Powers Limited for alleged misrepresentation of their net worth and joint venture to illegally get coal blocks, CBI sources said.
The sources said raids are being carried out at seven locations in Kolkata, Nagpur, Purulia and few other places.
The managing directors of these companies and unknown government officials have been charged with cheating, criminal conspiracy and under sections of Prevention of Corruption Act, they said.
Earlier, the CBI had registered five cases this month in this connection.
The cases were registered against AMR Iron & Steel Private Ltd, JLD Yavatmal Energy Ltd, Navbharat Power Private Limited, Vini Iron & Steel Udyog Ltd and JAS Infrastructure Capital Private Ltd.