Amazon Inc. founder Jeff Bezos’ net worth topped the US$150-Billion mark on Monday morning, making him the richest man in history.

Bezos crossed the symbolic threshold as Amazon was kicking off its 36-hour Amazon Prime Day summer sales event, aka Christmas in July.

Bezos’ net worth has soared by US$52-billion this year. So far.

Bezos is now worth some US$55-billion more than Microsoft Corp. co-founder Bill Gates, the world’s second-richest person.

His personal fortune is within spitting distance of the Walton (Walmart) family’s US$151.5-billion, the world’s richest family dynasty.