On May 18, when Facebook debuted at $38 on the public stock market, founder and CEO Mark Zuckerberg boasted a net worth of around $20 billion. This placed him as high as 21st on the list of world's wealthiest people—which we noted was an extraordinarily mind-blowing fact considering his age.
However, Facebook shares have consistently tumbled since then. And because the overwhelming majority of his wealth is tied to this single, highly volatile company, Zuck has seen his fortune sink by roughly $5 billion, or 25%, in less than two weeks. He's now outside of the top 40 billionaires.
This is a "first world problem," of course—I'm sure he'll survive just fine with his remaining billions—but it's still an incredibly dramatic change that highlights the tremendous troubles Facebook has faced in the short time since going public.
With Facebook shares down approximately 24%, the company's valuation has also plunged. From a high of $112 billion after it cracked $41 on opening day (a notably puny "pop" for the largest tech IPO ever), the social networks valuation now sits at about $79 billion.