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|Headquarters||New York City, United States|
Brian O'Kelley (CEO) |
Michael Rubenstein (President)
Infrastructure as a service |
Number of employees
AppNexus is an American multinational technology company whose cloud-based software platform enables and optimizes programmatic online advertising. Headquartered in New York City, the company has 23 offices in North America, Latin America, Europe, Asia and Australia.
AppNexus offers online auction infrastructure and technology for data management, optimization, financial clearing and support for directly negotiated advertising campaigns. It has both demand-side platform (DSP) and supply-side platform (SSP) functionalities. It integrates with advertising sources including Google's DoubleClick, Microsoft's AdECN, engage:BDR and other aggregators. It operates out of multiple data centers, including one in Amsterdam serving Europe and the Middle East, in a facility shared with Equinix.
On June 18, 2018, news outlets reported that AT&T is in talks to acquire the company. One week later, AT&T announced it was acquiring the company and putting it under its Ads and Analytics division as a subsidiary. AppNexus was reportedly sold for $1.6 billion while most news outlets speculated the company not to sell for less than $2 billion. 
On August 15, 2018, AT&T completes the acquisition of AppNexus and eventually expand its advertising and analytics division.
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 was financially backed by Microsoft, Khosla Ventures, First Round Capital, Venrock, Kodiak Venture Partners, Marc Andreessen, Ben Horowitz, and Ron Conway; as of 2015 the company had raised $250 million in financing.
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- "AppNexus Expands Video Buying, Adds New Video Demand Partners". www.mediapost.com. Retrieved 2016-05-22.
- Liz Gannes (2010-10-05). "AppNexus Raises $50M for Real-time Ad Platform: Tech News and Analysis «". Gigaom.com. Retrieved 2011-05-11.
- "Forbes Cloud 100". Forbes. Retrieved 17 November 2016.
- "AT&T Will Acquire AppNexus | AdExchanger". AdExchanger. 2018-06-25. Retrieved 2018-07-13.
- "AT&T Completes Acquisition of AppNexus". August 15, 2018.
- "Who We Are". AppNexus. Archived from the original on 17 May 2011. Retrieved 2011-05-11.
-  Archived December 12, 2010, at the Wayback Machine.
- "AppNexus Secures $8 Million in Series B Funding". Pr-inside.com. Archived from the original on 2012-06-14. Retrieved 2011-05-11.
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