- Allscripts-Misys Healthcare Solutions (MDRX)
- Athenahealth Inc. (ATHN)
- Cerner Corporation (CERN)
- eClinicalWorks Inc.
- Eclipsys Corp (ECLP)
- Epic Systems Corporation
- GE (GE)
- iMedica Corporation
- McKesson Corporation (MCK)
- Picis, Inc.
- Quality Systems,Inc. (QSII)
- Sage Software, Inc.
- The Trizetto Group, Inc.
- Wellsoft Corporation
The first company that showed up in Google search was Allscripts-Misys, which is listed at the top. The names that follow are taken from the last 10K of MDRX, where they are listed as competitors in EHR segment.