Gates is believed to be the only other person to reach $100 billion.
The online retailer's shares jumped more than two percent in anticipation of the extra income from the sales, causing 53-year-old entrepreneurs own fortune to go up by $2.4 billion (£1.8bn) to $100.3 billion (£75.2 bn), further securing his title of world's richest man. Black Friday sales helped Amazon shares to jump more than 2 percent and online holiday sales increase by more than 18 percent since previous year, Bloomberg reported.
In July, Bezos had pipped Bill Gates to briefly become the world's richest person for the first time.
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At the beginning of the year, Bezos cracked the top four, surpassing Inditex founder Amancio Ortega and USA investor Warren Buffett at the time.
By comparison, Bill Gates' current estimated net worth stands at a paltry $86.8 billion (£65.1bn). Gates, along with Buffett - who occupies the third slot on Bloomberg's list of richest people - have both given significant amounts of their wealth to charity.
Bezos has been giving away Amazon shares worth about $500 million every year since 2002. This past June he asked Twitter for ideas on how to be a better philanthropist. After the close of trading in NY on Friday, the billionaire's total net worth fell back down to $97.9 billion.
"I'm thinking I want much of my philanthropic activity to be helping people in the here and now - short term - at the intersection of urgent need and lasting impact", he wrote.