It was gathered that Bezos' fortune went up $2.4 billion to $100.3 billion, as the online retailer's shares jumped more than 2 percent on optimism for Black Friday sales.
Amazon CEO Jeff Bezos is now worth $100 billion, which makeshim the world's richest man.
The increase, to $100.3bn, is thanks in part to the clamour for Black Friday deals - Amazon shares have gone up 5% this week alone.
His current wealth is estimated at $86.8bn, but analysts say he would be worth $150bn had he not given away some 700 million in shares in Microsoft and $2.9bn to charity after re-inventing himself as a philanthropist. That put him ahead of Microsoft co-founder Bill Gates, who had held the position since May 2013. That said, Gates has given a significant amount of his fortune away to charity and in acts of philanthropy. Were he more selfish, Bloomberg estimates Gates could now be worth $150 billion.
Bezos started Amazon as a well to sell books online, and now Amazon's stature among investors reflects its growing dominance in the retail world, where it accounts for roughly a third of all e-commerce transactions, and its ambitions to push into other sectors of the economy. He has also requested ideas for philanthropic ventures on Twitter. Bezos' increase in net worth this year is partly due to an exceptionally profitable year for Amazon, which saw the acquisition of Whole Foods.
His goal was to tackle problems "at the intersection of urgent need and lasting impact".