8. Accuray
R&D spend: $56.7 million
Percent of revenues: 14.2%
2017 overall revenue rank: 84
Accuray (Nasdaq: ARAY) invents, makes and supports radiation therapy and radiosurgery platforms for treating multiple forms of cancer. Significant technologies coming out of the Sunnyvale, Calif.–based company’s R&D include the Radixact system fully integrated with the Accuray Precision treatment planning system and iDMS data management system. Accuray boasts that the Radixact system uses megavoltage x-ray radiation, refined beamline and fast imaging technology to deliver scalable and highly reliable treatment for patients with a variety of treatment requirements.