| Company type | Subsidiary |
|---|---|
| Industry | Online advertising |
| Founded | 2007; 18 years ago (2007) |
| Headquarters | New York City, United States |
Area served | Worldwide |
Key people | Michael Rubenstein (president) |
| Products | Infrastructure as a service Ad serving Analytics |
Number of employees | 1000+ |
| Parent | Xandr (2018-present) |
Xandr, formerly known asAppNexus, is an American multinationaltechnology company operating acloud-based software platform that enables and optimizes programmatic online advertising.[1] Headquartered in the Flatiron District of New York City, the company has 23 offices in North America, Latin America, Europe, Asia and Australia.[citation needed]
AppNexus offersonline auction infrastructure and technology for data management, optimization, financial clearing and support for directly negotiatedadvertising campaigns. It has bothdemand-side platform (DSP),supply-side platform (SSP), and ad serving functionalities. It integrates with advertising sources including Google's "Authorized Buyers" ad exchange,Magnite,Pubmatic and other aggregators.[2][3] It operates out of multipledata centers, including one inAmsterdam servingEurope and theMiddle East, in a facility shared withEquinix.[4]
In June 2018,AT&T announced it was acquiring the company and putting it under itsXandr division as asubsidiary.[5] AppNexus was reportedly sold for $1.6 billion, while most news outlets speculated the company did not sell for less than $2 billion.[6]
In October 2019, Xandr purchased Clypd, a privately-held technology company focused on enabling programmatic buying of linear television advertising.[7]
In December 2021, AT&T announced that they had agreed to sell Xandr toMicrosoft for an undisclosed price, subject to customary closing conditions, including regulatory reviews.[8]
AppNexus was founded by formerRight Media staff,CTOBrian O'Kelley, and Mike Nolet, product manager and director of analytics,[9] with Michael Rubenstein, a former vice president and general manager at GoogleDoubleClick, who joined AppNexus as president in September 2009.[10] The company was financially backed byMicrosoft,Khosla Ventures,First Round Capital,Venrock,[11] Kodiak Venture Partners,Marc Andreessen,Ben Horowitz, andRon Conway; as of 2015 the company had raised $250 million in financing. O'Kelley stepped down as CEO in October 2018.[12]
