Entegris, Inc. engages in the development, manufacture, and supply of specialty materials for the microelectronics industry. The company is headquartered in Billerica, Massachusetts and currently employs 10,000 full-time employees. The company went IPO on 2000-07-11. The firm operates through four segments: Microcontamination Control (MC), Specialty Chemicals and Engineered Materials (SCEM), Advanced Materials Handling (AMH), and Advanced Planarization Solutions (APS) Division. Its MC segment offers solutions to filter and purify critical liquid and gaseous chemistries. Its SCEM segment provides high-performance process chemistries, gases and materials, and materials delivery systems to support semiconductor and other advanced manufacturing processes. Its APS segment provides chemical mechanical planarization solutions, advanced materials and high-purity wet chemicals, including chemical mechanical planarization (CMP) slurries, pads, formulated cleaners and other electronic chemicals. Its AMH segment develops solutions to monitor, protect, transport and deliver critical liquid chemistries, wafers and other substrates.