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OpenX logo — The most innovative independent supply-side platform.

OpenX

The most innovative independent supply-side platform.

Founded 2007 United States Pasadena, United States 445 employees Secondary Market Total: $70.51M Advertising, Enterprise Software +2

General Information

Company Name OpenX
Founded Year 2007
Location United States Pasadena, United States
Employees 445
Industries Advertising, Enterprise Software, Internet +1
Funding Stage Secondary Market
Social

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About OpenX

OpenX is an innovative independent supply-side platform that aims to revolutionize the ad selling and buying experience. Founded in 2007 and based in the United States, the company addresses the demand for addressability, transparency, and sustainability in the advertising, enterprise software, and internet industries. Its slogan, "The most innovative independent supply-side platform," reflects its commitment to excellence in the field. The company's most recent investment was in the secondary market, which took place on 01 June 2015. The investor involved in this round was SharesPost Investment Management. This investment signifies the confidence that investors have in OpenX's vision and potential for growth in the dynamic digital advertising market. With its strong focus on innovation and customer satisfaction, OpenX continues to be a key player in the evolving ad tech landscape.

Business keywords: advertising technology, supply-side platform, programmatic advertising, digital advertising, ad selling, ad buying, demand addressability

Funding Rounds & Investors (7)

View All
Funding Stage Amount Investors Lead Investors Date
Secondary Market Undisclosed 1
Sharespost
01 Jun 2015
Venture Round Undisclosed 1
Wavemaker
01 Nov 2014
Series E $25.01M 6
Index Ventures, Sapphire Ventures +4
17 Jan 2013
Series D $20.00M 7
Presidio Ventures, Index Ventures +5
31 May 2011
Series C $10.00M 5
Index Ventures, DAG Ventures +3
26 May 2009
Series B $10.50M 4
Index Ventures, First Round Capital +2
31 Dec 2007
Series A $5.00M 6
Index Ventures, First Round Capital +4
13 Jun 2007

OpenX Alternatives & Competitors

View All Alternatives
OpenX vs
AdChina
AdChina China

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OpenX vs

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OpenX vs

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FAQ About OpenX

The most innovative independent supply-side platform.
OpenX was founded in 2007.
OpenX is headquartered in Pasadena, United States.
OpenX operates in Advertising, Enterprise Software, Internet and Platforms. Its work centres on advertising technology, supply-side platform, programmatic advertising and digital advertising.
OpenX has approximately 445 employees.
OpenX has completed 7 funding rounds, raising a total of $70.51M. The latest funding stage is Secondary Market.
Top alternatives and competitors to OpenX include AdChina, Kritter Software Technology, StackAdapt, Adelphic, 33Across Inc.. These companies operate in related industries and serve comparable markets. You can compare them side by side on Bounce Watch.
OpenX and AdChina are both companies in similar industries. Compare their funding, team size, growth signals, and market position on Bounce Watch to see which one fits your needs.

Source: BounceWatch company record for OpenX, https://www.bouncewatch.com/company/openx, updated 27 October 2025. When citing, please name BounceWatch and link this page.

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