Xandr, formerly known as AppNexus, is an American multinational technology company operating a cloud-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]
| Company type | Subsidiary |
|---|---|
| Industry | Online advertising |
| Founded | 2007; 17 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 |
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), 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 multiple data centers, including one in Amsterdam serving Europe and the Middle East, in a facility shared with Equinix.[4]
In 2016, AppNexus was ranked #21 on Forbes Magazine's "The Cloud 100" list.[5]
In June 2018, AT&T announced it was acquiring the company and putting it under its Xandr division as a subsidiary.[6] AppNexus was reportedly sold for $1.6 billion, while most news outlets speculated the company did not sell for less than $2 billion.[7]
In October 2019, Xandr purchased Clypd, a privately-held technology company focused on enabling programmatic buying of linear television advertising.[8]
In December 2021, AT&T announced that they had agreed to sell Xandr to Microsoft for an undisclosed price, subject to customary closing conditions, including regulatory reviews.[9]
AppNexus was founded by former Right Media staff, CTO Brian O'Kelley, and Mike Nolet, product manager and director of analytics,[10] with Michael Rubenstein, a former vice president and general manager at Google DoubleClick, who joined AppNexus as president in September 2009.[11] The company was financially backed by Microsoft, Khosla Ventures, First Round Capital, Venrock,[12] Kodiak Venture Partners, Marc Andreessen, Ben Horowitz, and Ron Conway; as of 2015 the company had raised $250 million in financing. O'Kelley stepped down as CEO in October 2018.[13]
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