This excerpt taken from the PNC 10-K filed Mar 2, 2009.
OPTIONS ISSUED FOR STERLING ACQUISITION
On April 4, 2008, in connection with the closing of the Sterling acquisition, we issued 325,489 PNC stock options upon conversion of all outstanding and unexercised Sterling options at that date. Of the total options issued, 159,676 were issued as nonqualified stock options, and the remaining 165,813 were issued as incentive stock options. These PNC options carry generally the same terms and conditions as the original Sterling options. Per the merger agreement, all outstanding options were deemed fully vested at the acquisition date. Accordingly, no ongoing stock option expense will be recognized for these options. The purchase price consideration for the Sterling acquisition included approximately $3.3 million related to these options.