Amazon founder Jeff Bezos was a $100-billion man on Monday as the online retail colossus raked in cash from the holiday weekend's cyber shopping spree.

Forbes magazine's real-time ranking of the richest people had Bezos on top, with a personal net worth of $100.3 billion.

Microsoft co-founder Bill Gates saw his net worth climb to a dizzying $89.4 billion but was relegated to being the second most affluent person on the planet.

Bezos owns almost 17 percent of Amazon, which he founded in a Seattle garage in 1994 after quitting a hedge fund job to sell books online.