Where's the postbox? xxxc2020 Cohen, whose estimated fortune is $9 billion, set up shop in1992 with just $25 million and earned a reputation as of thegreatest stock traders of his generation. He built a firm thathas posted a 25 percent average annual return, one of the bestperformance track records in the $2.4 trillion hedge fundindustry, despite charging investors some of the highest fees.