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The majority of ad tech companies on the public markets may have fared badly in recent months, but behind the scenes there are some seriously interesting pre-IPO ad tech startups

This ranking looks at the hotter companies subject to IPO (or at least big exit deal) rumors right now. Our data comes from CrunchBase, LinkedIn, our own reporting, and that of other business publications. We’ve tried to rank them by revenues, but have also taken into account headcounts, venture funding, and recent news and whispers.

5. MediaMath: The industry’s favorite

5. MediaMath: The industry's favorite


MediaMath CEO Joe Zawadzki.

CEO: Joe Zawadzki

Employees: 600+

Estimated revenues: $300 million to $400 million (according to our estimates.)

Total venture funding: $207.5 million

Comment: Last year we asked a bunch of executives which company they thought was the hottest ad tech startup, and MediaMath’s name kept coming up. The company claims to be profitable and said sales last year reached $311 million. In October it acquired social advertising firm Upcast, building out its ad tech stack to social channels like Facebook.