PNC » Topics » O PTION P RICING A SSUMPTIONS

This excerpt taken from the PNC 10-K filed Mar 2, 2009.

OPTION PRICING ASSUMPTIONS

For purposes of computing stock option expense, we estimated the fair value of stock options primarily by using the Black-Scholes option-pricing model. Option pricing models require the use of numerous assumptions, many of which are very subjective.

We used the following assumptions in the option pricing models to determine 2008, 2007 and 2006 stock option expense:

   

The risk-free interest rate is based on the US Treasury yield curve,

   

The dividend yield represents average yields over the previous three-year period,

   

Volatility is measured using the fluctuation in month-end closing stock prices over a period which corresponds with the average expected option life, but in no case less than a five-year period, and

   

The expected life assumption represents the period of time that options granted are expected to be outstanding and is based on a weighted average of historical option activity.

 

Weighted-average for the year ended
December 31
   2008     2007      2006  

Risk-free interest rate

   3.1 %   4.8 %    4.5 %

Dividend yield

   3.3     3.4      3.7  

Volatility

   18.5     18.8      20.5  

Expected life

   5.7 yrs.     4.3 yrs.      5.1 yrs.  
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