(3) Includes accounts payable, accrued expenses, and accrued compensation and benefits.

(4) The first quarter of 2010 and 2009 includes $15.6 million and $2.5 million, respectively, for payments of withholding taxes in connection with vesting of restricted stock units and restricted stock.

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Contact:

PTC
Kristian P. Talvitie, 781-370-6151
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