Bonus: he hasn't been caught yet. His crimes are still on-going.

Same principal crime model as Madoff though: own a market making business + a hedge fund, sell stocks (naked), take the money, give nothing in return.

There's some other petty stuff like front running household investors through PFOF and instructing the broker you buy order flow from to shut down the buy button for retail investors when the price moves against you. But that's just the petty crime.