Although rumors of its performance have long circulated on Wall Street, the actual numbers are even more mind-blowing: From 1988 to 2018, Medallion returned 66.1% annually before fees. Net of fees, the gains were 39.1%. Estimated trading profits during those 30 years amounted to $104.5 billion. (About those fees: If the standard hedge fund management fee of 2%, plus 20% of the profits sounds expensive, then what do you think Medallion’s “5 and 44”?)