PTC to Unify Management of Product Hardware and Software Development Lifecycles with Acquisition of MKS

NEEDHAM, MA and WATERLOO, ON – April 7, 2011 – PTC (Nasdaq: PMTC), The Product Development Company®, and MKS Inc. (TSX: MKX), a global application lifecycle management (ALM) technology leader, today announced that they have entered into a definitive acquisition agreement (the “Arrangement Agreement”) pursuant to which PTC has agreed to acquire MKS for CDN$26.20 per share