It's no secret tech leaders wield a large influence when ranking the world's richest people.

Eight of the top 20 billionaires in the world earned their wealth through the tech sector, according to Bloomberg's billionaires index.

Of those tech billionaires, seven are among the top 10 richest overall.

The tech billionaires on the list earned their fortunes through industries including automotive, online retail, software and social media. The seven tech entrepreneurs have a combined net worth topping $936 billion.

But they've also lost plenty of cash compared to this time a year ago.

According to Bloomberg, the combined net worth of the eight tech billionaires in the top 20 plunged by $256 billion, roughly equal to the gross domestic product of New Zealand, based on World Bank data.

Who are the eight tech billionaires and how did they make their money?

Here's a breakdown of the tech leaders on Bloomberg's list as of Friday.

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Mark Zuckerberg

Net worth: $63.8 billion

Change from a year ago: Down $61.7 billion

Where he ranks: 17th

How he made his money: Zuckerberg co-founded Facebook, which helped usher in the era of social media by connecting family, friends, and the occasional random person from high school you really don't talk to that often. Facebook eventually morphed into Meta to better reflect the company's shift toward virtual reality and the metaverse.

Larry Ellison

Net worth: $88.8 billion

Change from a year ago: Down $18.4 billion

Where he ranks: 10th

How he made his money: Ellison co-founded software giant Oracle in 1977 in Silicon Valley. Ten years later, it would go on to become the largest database management company in the world. Ellison also owns his own Hawaiian island.

Steve Ballmer

Net worth: $94.6 billion

Change from a year ago: Down $11 billion

Where he ranks: 9th