X0305 4 2012-05-23 0 0001354217 Volcano Corp VOLC 0001468345 TOPOL ERIC C/O VOLCANO CORPORATION 3661 VALLEY CENTRE DRIVE, SUITE 200 SAN DIEGO CA 92130 1 0 0 0 Non Qualified Stock Option (right to buy) 28.49 2012-05-23 4 A 0 5689 0 A 2019-05-23 Common Stock 5689 5689 D Restricted Stock Units 0 2012-05-23 4 A 0 2193 0 A Common Stock 2193 2193 D 1/12th of the shares underlying such option shall vest in equal monthly installments over a period of one years,contingent upon continuous service. 100% of the Restricted Stock Units shall vest on the earlier of the date of the first annual meeting of the stockholders to be held in 2013 and the first anniversary of the Date of Grant, contingent upon continuous service. /s/ Darin Lippoldt, Attorney-in-Fact 2012-05-24