Jim Simons definitely has the greatest track record of all time.
I am not sure Livermore and risk management went well together.
%%The greatest trader of all time is Jesus Christ. Anyone who can take a few loaves and fishes and feed thousands and have baskets full leftover is hands down the greatest. The dude was a freak.

\ sorry he never grew up much.Hello GlobalMacro90,Jim Simons definitely has the greatest track record of all time.
%%I would guess after his bankruptcies he again borrowed money to trade. Or had credit lines with various brokers.
Back in 2003 i opened a credit account with IG Index in the UK, there was no need to put any money down. They don't offer that facility anymore.

on the retail side, I do not know. Mark B. is very good trader.