OpenX
PrivateLast Round
Series E
Jan 17, 2013
Total Funding Raised
$73M
Momentum
Top 25%
of companies Caplight tracks
Company Overview
OpenX is an advertising technology company that provides a supply-side platform (SSP) and ad exchange to help publishers and brands manage and monetize digital advertising inventory.
Sector
Media, Entertainment & Gaming
Verticals
Digital Advertising, Digital Publishing, Marketing
Business Model
B2B
Customer Profile
Marketplace Commission, Usage-Based SaaS
AI Layer
Infrastructure
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
OpenX Comparables
Compare OpenX with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Index Exchange | 89% | |
| PubMatic, Inc. | 87% | |
| TripleLift | 83% |
OpenX Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series E | Jan 17, 2013 | ||||
| Series D | May 31, 2011 | ||||
| Series C | May 26, 2009 | ||||
| Series B | Jan 16, 2008 | ||||
| Series A | Jun 13, 2007 |
OpenX Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Carta Communication | Series E |
| O'Reilly AlphaTech Ventures | Series A, Series B |
| Coastal Grove Partners | Series E |
| Mangrove Capital Partners | Series C, Series A, Series B |
| Mitsui Global Investment | Series E, Series D |
| SharesPost | Series E |
| AOL Ventures | Series D |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 21, 2026
Joseph Worswick promoted to SVP of Global Partnerships.
- Apr 21, 2026
Erika Loberg promoted to VP of CTV and Curation.
Recent news
Latest coverage and updates
- recognized_asAug 25, 2026
OpenX group recognized as finalist in the Best Sell-Side Focused Technology category at AdExchanger Awards.
- hiresJun 30, 2026
OpenX group hires Joshua Metzger as interim CEO.
- launchesJun 25, 2026
OpenX group launches AI intelligence for media buying..
- launchesJun 24, 2026
OpenX group launches suite of AI and machine learning capabilities.
- launchesJun 23, 2026
OpenX group launched OpenX IQ on Jun 23rd '26.
OpenX Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
Request accessFrequently Asked Questions
Common questions about OpenX's valuation, stock price, and market status.
Is OpenX a public or private company?
OpenX is a private company.
What is the current stock price of OpenX?
OpenX is a private company with no public stock price. No recent secondary market data is available.
How much is OpenX worth (valuation)?
Valuation information for OpenX is not publicly available.
Can I buy OpenX stock?
OpenX shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors. Visit https://www.caplight.com to learn more.
When was OpenX's last funding round?
OpenX's most recent funding round was Series E on January 17, 2013.
Who are the main investors in OpenX?
Key investors in OpenX include Samsung Venture Investment, Sapphire Ventures, Index Ventures, DAG Ventures, Accel.
Will OpenX IPO soon?
No public IPO plans have been announced for OpenX.
How can I track OpenX secondary market activity?
Caplight tracks bids, offers, and trades for private companies. Visit https://www.caplight.com to monitor OpenX's secondary market activity and sign up for updates.