Jeff Bezos had a pretty bad day Friday, and an even worse month, as the founder, chief executive and, more importantly, the largest shareholder of Amazon.com Inc. . The stock plunged $48.35, or 7.6%, on Friday, the biggest one-day price drop since Amazon went public in May 1997, in the wake of its fourth-quarter results. Bezos owned 82,914,455 Amazon shares, or about 18% of the shares outstanding, as of Dec. 31, according to FactSet, meaning he may have lost $4.01 billion on Friday. With the stock down $88.89, or 13%, year to date, Bezos may have lost $7.37 billion so far this year. But no need to feel too bad for Bezos, because at Friday's closing price of $587, his holdings are still worth $48.67 billion.
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