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Adnxs appeared as the eighth-biggest name in the Tracking the Trackers data. AppNexus, which offers the most powerful, open and customizable advertising technology platform, serves the largest and most innovative buyers and sellers of online advertising, including Microsoft Advertising Exchange, Interactive Media (Deutsche Telekom), and Collective

About
Adnxs.com is run by AppNexus, a company that provides technology, data and analytics to help companies buy and sell online display advertising.

The technology it uses can plug into other advertising serving platforms, such as Google's Doubleclick, and "data aggregators", such as Quantcast, which provide behavioural targeting. In essence, this makes AppNexus an an "advertising exchange for advertising exchanges".

Products and Services
Appnexus uses cookies and web beacons to create different groups of users. The information it collects is used to target advertising.

Web beacons may also appear on these websites and work in conjunction with the cookies to identify the types of pages a browser is visiting. It is also possible that web beacons may be included in advertising that is using the AppNexus service to provide data about the success of the adverts and whether browsers who clicked on adverts then went on to buy anything.

AppNexus offers a number of different services, including:

Ad exchange
An auction marketplace where advertisers can bid for ad slots on certain websites.

Data aggregator/supplier
The company collects data from a range of online and sometimes offline sources and provides data to advertisers directly or via its exchange.

Demand-side platform
Technology provider that enables advertisers to buy ad inventory from other ad exchanges.

Clients
AppNexus is the main client of Adnxs. It serves as an intermediary for sites that are currently unknown.

AppNexus says it only shares data when it is aggregated into a report or when required by law (this is the same for all organizations that store data).