What is OpenX?
Established in 2007 and headquartered in Pasadena, California, OpenX operates as a sophisticated online advertising technology company. The firm specializes in programmatic advertising and real-time bidding, providing a comprehensive platform that facilitates the automated buying and selling of digital ad inventory. By bridging the gap between supply-side platforms and demand-side requirements, OpenX has positioned itself as a foundational utility in the modern adtech stack, enabling publishers to maximize yield while providing advertisers with precise audience targeting capabilities.
How much funding has OpenX raised?
OpenX has raised a total of $80.5M across 6 funding rounds:
Series A
$5M
Series B
$15.5M
Series C
$10M
Series D
$20M
Series E
$25M
Debt
$5M
Series A (2007): $5M with participation from Index Ventures, First Round Capital, O'Reilly AlphaTech Ventures, and Mangrove Capital Partners
Series B (2008): $15.5M led by Index Ventures, Mangrove Capital Partners, Accel Partners, First Round Capital, and O'Reilly AlphaTech Ventures
Series C (2009): $10M supported by Jonathan Miller, Mangrove Capital Partners, DAG Ventures, Index Ventures, First Round Capital, and Accel
Series D (2011): $20M featuring Mitsui Global Investment, Aol Ventures, and Sapphire Ventures
Series E (2012): $25M backed by SAP Ventures, Mitsui Global Investments, Presidio Ventures, Index Ventures, Samsung Ventures, Accel Partners, and Cyber Communications
Debt (2020): $5M with participation from PPP
Key Investors in OpenX
Index Ventures
Index Ventures is a venture firm investing in the next generation of entrepreneurs from seed to IPO. They partner with founders with bold dreams that challenge the status quo to build enduring companies.
Sapphire Ventures
Sapphire Ventures is a venture capital firm focused on investing in and providing services to technology companies. They are based in Palo Alto, California.
Mitsui Global Investments
Mitsui & Co. Global Investment, Inc. specializes in guiding innovative entrepreneurs by providing not just financial support but also strategic guidance to help them reach the global stage.
What's next for OpenX?
Looking ahead, the strategic focus for OpenX remains centered on maintaining its competitive edge in an increasingly privacy-conscious and fragmented digital market. The recent capital deployment suggests a commitment to enhancing platform efficiency and expanding its technological footprint. As the industry shifts toward cookieless solutions and identity-based advertising, OpenX is well-positioned to leverage its historical investment base to pivot toward next-generation ad delivery models. The company's ability to secure diverse forms of financing, including debt and equity, provides the necessary liquidity to pursue potential acquisitions or R&D initiatives aimed at sustaining long-term growth in the global programmatic sector.
See full OpenX company page
