O
OpenX
OpenX has the largest independent ad exchange network for publishers and demand partners, while maintaining the highest quality marketplace standards
At a glance
- Founded
- 2007
- Headquarters
- Pasadena, United States
- Sector
- Marketing
- Power Law
- Thoroughbred$100M+ revenue
News
More headlines
Investors
From Dealroom's funding and investor records, grouped by the round each investor first entered.
Seed4 investors entered at this stage
- LOLocalGlobe
Mangrove Capital Partners
Index Ventures
First Round Capital
Series B and later8 investors entered at this stage
Wavemaker Partners
Accel- SVSamsung Ventures
- CCCarta Communications
- YEyet2ventures
Sapphire Ventures- MIMitsui Global Investment
- JMJonathan Miller
Ownership
Estimated cap table from Dealroom's shareholder data — share of equity by holder. Stakes as last recorded by Dealroom (2026). Percentages are indicative.
Some investors are hidden on this public profile. See the full cap table on Dealroom →
Source: Dealroom Talent Intelligence.
Alumni founders
Former OpenX employees who went on to found companies, sorted by Dealroom signal score.
Jonathan MillerUnited States
Miki RapoportUnited States
Igor TelyatnikovUnited States
Michael ToddUnited StatesGlobal footprint
team presence
across markets
Investments and acquisitions
Disclosed deals where OpenX was the backer or acquirer, 2012–2017. Toggle between venture rounds, M&A, or both. The map below is grouped by the target company's sector — the colored pill on each chip is the round type.
3 deals across OpenX's capital deployment.
Where the deals concentrate by sector, stage, and decade.
OpenX's portfolio, mapped.
Market sentiment
An AI-synthesised read of the highest-engagement posts about OpenX on X, ranked by likes and reposts, corporate channels excluded.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
See OpenX on the full Dealroom platform
Live deal flow, founder pedigree, hiring signals, revenue trajectory, and the full cap table.