OpenX
OpenX is a leading independent supply-side platform (SSP) in programmatic advertising, headquartered in Pasadena, California. Founded in 2007, the company specializes in audience, data, and identity targeting, serving over 1/4 trillion ads monthly. OpenX pioneered the first real-time bidding (RTB) ad exchange in 2010, which significantly advanced automated ad buying in the industry. The company offers a cloud-based SSP that connects publishers with global demand sources, optimizing revenue through real-time bidding and advanced audience targeting. Operating exclusively on Google Cloud Platform, OpenX focuses on scalability and efficiency, reducing time-to-market for new features. It supports mobile, desktop, and connected TV (CTV) advertising, enhancing monetization for publishers. OpenX is also recognized for its commitment to sustainability, being the first adtech company certified as CarbonNeutral™.
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Headcount trend
OpenX went from 212 employees in Jul 2023 to 275 in Jun 2025. Jan to Jun 2025: 32 people joined, 11 left.
Headcount data through Jun 2025
Org structure
Headcount by department
Hiring now
See all jobsFunding
- Jan 2013 · Series E · $25M · Samsung Ventures, Accel Partners, Index Ventures
- May 2011 · Series D · $20M · SAP Ventures, AOL Ventures, Presidio Ventures
- May 2009 · Series C · $10M · DAG Ventures, Accel Partners, Index Ventures
- Jan 2008 · Series B · $10.5M · Accel Partners, First Round Capital, Index Ventures
- Jun 2007 · Series A · $5M · First Round Capital, Index Ventures, Mangrove Capital Partners
Salaries at OpenX
All salaries37 salary profiles in the US
Most reported roles
H-1B sponsorship
The department split adds up all the years listed above. FY2026 alone: 2 filings.
Peer reviews
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Anonymous peer reviews on OffTheRecord
Similar companies
OpenX FAQ
How many employees does OpenX have?
OpenX has about 275 employees, up 2.6% over the 3 months to Jun 2025.
Does OpenX sponsor H1B visas?
Yes. OpenX filed 2 H1B (LCA) applications in FY2026, according to the latest U.S. Department of Labor disclosures. Most of them were for Engineering roles.
What is OpenX's revenue per employee?
OpenX makes about $727K in revenue per employee, based on $200M annual revenue and 275 employees.
How much does OpenX pay?
6figr has 37 salary profiles for OpenX in the US, with pay broken down by role, level, gender and ethnicity on the OpenX salaries page. See OpenX salaries
How much funding has OpenX raised?
OpenX has raised $70.51M in total funding; its latest round was Series E in Jan 2013.
Data from Company Prospectus, DOL LCA disclosures, WARN notices and 6figr salary profiles.
