AppNexus is a New York City-based company that provides a platform specializing in real-time online advertising.As of 2010, the company auctions more than four billion ads per day on a real-time basis.
 

AppNexus offers online auction infrastructure and technology for data management,optimization, financial clearing and support for directly negotiated advertising campaigns. It integrates with advertising sources including Google's DoubleClick, Microsoft's AdECN, and aggregators.It operates out of multiple data centers, including one in Amsterdam serving Europe and the Middle East, in a facility shared with Equinix.
 

 

Founders and financing

AppNexus was founded by Brian O'Kelley (the ex-CTO of Right Media) and Mike Nolet (former product manager and Director of Analytics at Right Media); Michael Rubenstein, a former VP and General Manager at Google's DoubleClick, joined AppNexus as President in September 2009.[The company is financially backed by Microsoft, Khosla Ventures, First Round Capital, Venrock,[7] Kodiak Venture Partners, Marc Andreessen, Ben Horowitz, and Ron Conway; as of February 2013 the company has raised over $140 million in financing, with a $75 million funding round in January 2013.