MKS, Inc is a subsidiary of PTC, Inc. It was previously a multinational independent software vendor that was acquired by Parametric Technology Corporation on May 31, 2011. MKS operated in the Application Lifecycle Management and Systems Administration market segments. Integrity, a PTC Product manages systems and software development processes and connects engineering artifacts, including requirements, models, code and test, ensuring comprehensive lifecycle traceability. PTC's Integrity Business Unit supports customers across these four core industries: Automotive, Aerospace & Defense, High Tech Electronics and Medical Devices.