Only these 2 CEOs make Zuckerberg look poor

Mark Zuckerberg plans to give away 99% of his $ 45 billion fortune in Facebook ( FB) — probably figuring he’ll still be fabulously wealthy. He’s right — but it’s amazing how right he is.

Just two current CEOs of companies in the Standard & Poor’s 500, Warren Buffett of Berkshire Hathaway ( BRK. A) and Jeffrey Bezos of Amazon. com ( AMZN), hold shares in their companies worth more than Zuckerberg’s stake in Facebook, according to a USA TODAY analysis of data from S& P Capital IQ. Buffett and Bezos’ stakes are valued at $ 61.7 billion and $ 56.2 billion, respectively, according to a USA TODAY analysis of data from S& P Capital IQ.

That’s not to belittle the move by Zuckerberg, who this week showed off photos of his new baby, a big lifechanging event that sparked all the talk about his fortune’s future.

S& P 500 CEOS WITH THE MOST VALUABLE STAKES IN THEIR COMPANIES

Zuckerberg certainly has lofty goals for the money he’s giving away: It’s a fortune that puts him among the CEO legends. Here are some numbers to put the vast size of Zuckerberg’s fortune into perspective — even among the ranks of CEOs:

ZUCKERBERG IS ALREADY A TITAN. Zuckerberg’s ownership in Facebook alone accounts for 17% of all the value current CEOs hold in their own companies’ shares, based on S& P Capital IQ data.

EVEN 1% OF ZUCKERBERG’S WEALTH IS STILL STAGGERING. Even after giving away 99% of his Facebook holdings, Zuckerberg’s remaining stake is worth $ 453.9 million. That remaining 1% stake is larger than all but 24 of CEOs’ total stakes in their companies among the S& P 500. Zuckerberg’s stake is also just below the average $ 536.6 million position held by the current CEOs that have reported their holdings.

ZUCKERBERG’S BIG OWNERSHIP HAS PAID OFF. Facebook might be worth 44% less than its chief rival, Alphabet, but Zuckerberg has maintained a 15% stake in Facebook, while Alphabet’s Larry Page has just a 6.3% stake in Alphabet. That means Zuckerberg’s holding in Facebook is worth much more than Page’s $ 33.3 billion stake in Alphabet.

WEALTH IS CONCENTRATED — EVEN IN THE CEO WORLD. Just four CEOs — Buffett, Bezos, Zuckerberg and Page — have holdings in their companies worth $ 30 billion or more. CEOs’ holdings drop off after that. The median holding of S& P 500 CEOs in their company stock, or the midpoint between the highest and the lowest stakes, is $ 17.8 million.