The 9 richest people in tech

A jump in Amazon's share price has propelled the CEO into top place, knocking Gates off his post after four years running. If this holds until the end of the day's trading, Bezos will have a net worth of roughly $90 billion.

Technology tycoons continue to dominate lists of the richest people in the world. According to the Bloomberg Billionaires Index, one-third of the 30 richest billionaires have earned their fortunes in this sector.

Tech money proves to be hard-earned as well: All nine of the richest billionaires are self-made, thanks to the powerful companies they built themselves, including Amazon, Facebook, Microsoft, and Google.

For the ranking, Business Insider culled data from the Bloomberg Billionaires Index as of July 27, as well as live data from Amazon's share price. The index updates daily to provide up-to-the-minute data on the world's wealthiest men and women. You can read the full methodology here.

Below, read on to see the nine richest billionaires who made their fortunes in tech.

Emmie Martin contributed reporting to an earlier version of this article.