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By looking in the annual report for the mandatory footnote about stock options, you can see how large the “option overhang” is. AOL Time Warner, for example, reported in the front of its annual report that it had 4.5 billion shares of common stock outstanding as of December 31, 2002—but a footnote in the bowels of the report reveals that the company had issued options on 657 million more shares. So AOL’s future earnings will have to be divided among 15% more shares. You should factor in the potential flood of new shares from stock options whenever you estimate a company’s future value.
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