X0303 4 2011-05-09 0 0000879993 DUSA PHARMACEUTICALS INC DUSA 0001375485 Todisco Michael C/O DUSA PHARMACEUTICALS, INC. 25 UPTON DRIVE WILMINGTON MA 01887 0 1 0 0 Vice President, Controller Common Stock 2011-05-09 4 F 0 873 5.80 D 98942 D These shares represent payment of withholding tax liability incident to the vesting of restricted stock granted May 9, 2008. Includes Stock Awards which vest at the rate of one-quarter of the total grant on each of the first, second, third and fourth anniversaries of the date of the grant. This amount also includes 16,665 shares which are held jointly with his spouse. /s/ Michael Todisco 2011-05-10