Steve Cohen, who is worth $9.2 billion, was banned from investing in 2016 after a lawsuit with the SEC. : Billionaire hedge-fund manager Steve Cohen is reportedly in talks to add the New York Mets to his already impressive portfolio of luxury real estate and modern art. Cohen first invested $20 million in the Mets in 2012, Bloomberg reported. That investment paid off. Bloomberg valued Cohen's stake at $90 million in 2017 — a 350% increase in 5 years. It hasn't always been smooth sailing for Cohen, however.