Advertising group Interpublic Group owns a stake in Facebook that could be valued at roughly $200 million to $300 million, The Financial Times reported.

The exact size of the stake has not been disclosed, but people close to Interpublic say it owns slightly less than a half percent of Facebook, the newspaper said in its electronic edition. Interpublic paid less than $5 million for the stake in 2006, the newspaper said.

Interpublic's stake of 0.4 percent would be worth $200 million, based on a Facebook valuation of about $50 billion, the newspaper said.

Interpublic could not be immediately reached for comment.

(Reporting by Jessica Hall; Editing by Dhara Ranasinghe)