Mark Zuckerberg's net worth took a pretty big hit the past week, as investigators reviewed Facebook's bungled IPO and the company's shares slid further and further below their offering price.

Shares of Facebook fell below $29 yesterday for the first time, and the company's co-founder and CEO saw his fortune tumble right along with it. According to Bloomberg, Zuck's 503.6 million shares are now worth $14.7 billion, which knocks him off Bloomberg's Billionaire's Index of the 40 wealthiest individuals in the world.

Facebook began trading publicly on May 18. When the market closed that day, the company's stock was valued at $38.23, up just $0.23 cents from its offering price. Zuck's net worth jumped slightly from $19.1 billion to $19.4 billion during the day.

As of Wednesday morning, Colombia's Luis Carlos Sarmiento held the number-40 spot on Bloomberg's list, with an estimated net worth of $15.5 billion.

Zuck, who married college sweetheart Priscilla Chan the day after Facebook's Nasdaq debut, doesn't seem to be wringing his hands over his billions. The couple was recently spotted honeymooning in Rome, Italy, where they enjoyed local landmarks like the Sistine Chapel and even made a quick stop at McDonald's.

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