David Grain is a $2.5 billion telecom billionaire. Here are the 7 companies that got him there.
David Grain's $2.5 billion fortune is built on a growing portfolio of broadband, fiber and spectrum companies spanning the US and Canada.
Telecom billionaire
Telecom billionaire Mike Adenuga loses $9 million in 200 days from stake in Conoil
Adenuga holds a majority stake in the oil marketing business.