Software Testing , Business Services , Project Management | 1 More - Chicago, Illinois, United States
- $7.3B
- 10K+
Software Testing , Business Services - Lincolnshire, Illinois, United States
- $5.4B
- 1K - 5K
Software Testing , Business Services - Chicago, Illinois, United States
- $4B
- 1K - 5K
Software Testing , Business Services , Security Information and Event Management (SIEM) - Schaumburg, Illinois, United States
- $2.6B
- 5K - 10K
Software Testing , Business Services , Healthcare Software | 2 More - Chicago, Illinois, United States
- $1.4B
- 1K - 5K
Software Testing , Business Services , Document Management | 1 More - Chicago, Illinois, United States
- $1.1B
- 1K - 5K
Software Testing , Business Services - Chicago, Illinois, United States
- $1B
- 10K+
Software Testing , Business Services - Downers Grove, Illinois, United States
- $779.9M
- 1K - 5K
Software Testing , Business Services - Chicago, Illinois, United States
- $731.2M
- 1K - 5K
Software Testing , Business Services , Data Collection & Internet Portals | 3 More - Chicago, Illinois, United States
- $724.4M
- 1K - 5K
Top Software Testing companies in Illinois - August, 2026
Listed below are the top companies in Illinois by revenue as of August 2026. With $7.3B in revenue, R1 RCM is ranked first on the list, followed by Proact with $5.4B in revenue and AHEAD with $4B in revenue. Find additional information about companies in Illinois such as their contact details, employees, location, org chart, news and much more.Location
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