While the approach described above will provide the precise value, there are two
short cuts available. One is to divide the value of equity by the fully diluted
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number of
shares outstanding rather than by the actual number. This approach will underestimate the
value of the equity, because it fails to consider the cash proceeds from option exercise.
The other shortcut, which is called the treasury stock approach, adds the expected
proceeds from the exercise of the options (exercise price multiplied by the number of
options outstanding) to the numerator before dividing by the number of shares
outstanding. While this approach will yield a more reasonable estimate than the first one,
it does not include the time value of the options outstanding. Thus, it tends to overstate
the value of the common stock.
warrants.xls: This spreadsheet allows you to value the options outstanding in a firm,
allowing for the dilution effect.
Illustration 12.10: Value of Equity Options
Disney has granted considerable numbers of options to its managers. At the end of
2003, there were 219 million options outstanding, with a weighted average exercise price
of $26.44 and weighted average life of 6 years. Using the current stock price of $26.91,
an estimated standard deviation
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of 40, a dividend yield of 1.21%. a riskfree rate of 4%
and an option pricing model, we estimate the value of these equity options to $2.129
billion.
31
The value we have estimated for the options above are probably too high, since
we assume that all the options are exercisable. In fact, a significant proportion of these
options (about 50%) are not vested
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yet, and this fact will reduce their estimated value.
We will also assume that these options, when exercised, will generate a tax benefit to the
firm equal to 37.3% of their value:
After-tax value of equity options = 2129 (1-.373) = $1334.67 million
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We assume that all options will be exercised, and compute the number of shares that will be outstanding
in that event.
30
We used the historical standard deviation in Boeing’s stock price to estimate this number.
31
The option pricing model used is the Black-Scholes model. It is described in more detail in the appendix.
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When options are not vested, they cannot be exercised. Firms, when providing options to their
employees, firms often require that they continue as employees for a set period before they can exercise
these options.