The trader(s) with the highest virtual equity at the end of each event wins! Depending on the prize payout structure, there may be more than one winner.
Please note that your virtual equity is simply, well, virtual. No actual securities are for sale, and no actual securities are traded, which means that the figures you see on the screen are just for the game, but you can still win cash prizes!
Next suggested article: Who am I competing against in Speedtrading™ events?