Lex Luthor
Luthor has been known to squander his fortune in madcap, evil schemes to take over the world, but as a general rule he bounces back onto the Rich list with room to spare. One of the world's smartest men (possibly the smartest, depending on who you believe and whether you count resident Sons of Krypton) and a ruthless business opponent, he makes Machiavelli look like Mary Poppins.

Worth: $4.7 billion