Carl Icahn is Worth $23 Billion — And He's Reportedly Betting Against GameStop's Stock It was reported Monday that the billionaire of Icahn Enterprises is holding an unknown position in GameStop for shorting. Previous Article 8 Must-Have Elements For Your Franchise Brand or Business Website Next Article Choosing a Mattress? Now That the Venture-Capital-Charged Marketing Hype Is Over, It's Time to Focus on Quality, Value, and Sleep.