OpenX
PrivateLast Round
Series E
Jan 17, 2013
Total Funding Raised
$82.48M
Momentum
Top 10%
of companies Caplight tracks
Company Overview
OpenX operates in Media, Entertainment & Gaming and is based in Pasadena, California. Its latest recorded funding round was a Series E round in January 2013.
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, Services & Consulting
AI Layer
Application
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% |
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OpenX Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series E | Jan 17, 2013 | ||||
| Series E | Mar 12, 2012 | ||||
| Series D | May 31, 2011 | ||||
| Series C | May 26, 2009 | ||||
| Series B | Dec 1, 2007 | ||||
Series A | Jun 13, 2007 |
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Key People
Founding team and executive leadership
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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 |
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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.
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Recent news
Latest coverage and updates
- hiresNov 2, 2026
OpenX group appoints Robert Horler as Chief Executive Officer in New York on Nov. 2nd '26 to lead its next phase of growth through buyer-direct relationships, AI-enabled solutions, and enterprise software offerings.
- receives_awardOct 13, 2026
The OpenX group marketing team receives a Platinum MarCom Award from the MarCom Awards for introducing the company as The Intelligent SSP(TM) and bringing its new identity to life across more than 1,000 assets.
- hiresOct 1, 2026
OpenX group announced the appointment of John Rogers as Senior Vice President, Global Publisher Development on Oct 5th '26; he will lead the company’s global publisher business development and account management teams.
- recognized_asSep 21, 2026
The Wires Global Awards shortlist OpenX group among the 2026 finalists for Best Marketing Technology Solution and Best New Product or Service: Sell Side.
- recognized_asAug 25, 2026
At the AdExchanger Awards in Aug '26, OpenX group is named a finalist in the Best Sell-Side Focused Technology category for bringing custom decisioning closer to supply and helping buyers and partners activate proprietary intelligence more efficiently.
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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.
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Frequently 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, so its shares have no public market price. Caplight tracks OpenX's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
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.
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 in OpenX's shares on secondary markets.