In the stock market today, the Maran family-owned broadcasting firm Sun TV tumbled by as much as 16 per cent in early trade on the bourses today after CBI conducted raids on the premises of owner Kalanithi Maran and his brother, former Telecom Minister Dayanidhi Maran.

CBI today conducted raids on the premises of the Maran brothers in Delhi and Chennai after registering a case against the former Telecom Minister in connection with the controversial Aircel-Maxis deal.

The agency has also booked Kalanithi Maran, Maxis owner T Ananda Krishnan, senior executive Ralph Marshall and three companies -- Aspro, Maxis and Sun TV -- in the case on charges of criminal conspiracy under the IPC and Prevention of Corruption Act.