- Accuray Inc.
- Eckert & Ziegler AG
- Elekta AB
- General Electric Company
- Hitachi Ltd.
- Ion Beam Applications SA
- Koninklijke Philips N.V.
- Mevion Medical Systems Inc.
- TeamBest Group
- Reflexion Medical Inc.
- Sensus Healthcare Inc.
- Varian Medical Systems Inc. (Siemens Healthineers AG)
- Xoft Inc. (iCAD Inc.)
- Xstrahl Inc.
- Zap Surgical Systems Inc.