Xandr is a data and technology company that operates AT&T’s advertising business. In 2020, Microsoft acquired Xandr for $1.6 billion in cash and stock. In September 2018, Xandr acquired AppNexus. The acquisition helps Xandr to expand its capabilities in programmatic advertising and create a more holistic approach to advertising for AT&T’s customers.

AppNexus is a technology company that provides a real-time bidding platform for Internet advertising. The company was founded in 2007 by Brian O’Kelley and Michael Rubenstein. AppNexus is headquartered in New York City, with offices in San Francisco, London, Chicago, Paris, Hamburg, Sydney, Toronto, and Boston.

Xandr operates a software platform that enables and optimizes programmatic online advertising. The company’s technology powers real-time bidding (RTB) in display, mobile, and video advertising. Xandr has been described as an advertising exchange, and as a technology platform that helps companies automate the buying and selling of digital advertising.

The Xandr platform is used by demand-side platforms (DSPs), ad exchanges, and publishers. Advertisers use Xandr to buy display, mobile, and video advertising inventory. Publishers use AppNexus to sell their advertising inventory.

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