AppNexus

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Technology company

title: "AppNexus" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["2007-establishments-in-new-york-city", "pay-per-click-search-engines", "e-commerce-software", "online-companies-of-the-united-states", "american-companies-established-in-2007", "marketing-companies-established-in-2007", "online-advertising-services-and-affiliate-networks", "mass-media-companies-based-in-new-york-city", "microsoft-acquisitions", "microsoft-subsidiaries", "2018-mergers-and-acquisitions"] description: "Technology company" topic_path: "geography/united-states" source: "https://en.wikipedia.org/wiki/AppNexus" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Technology company ::

::data[format=table title="Infobox company"]

FieldValue
nameAppNexus Inc.
typeSubsidiary
industryOnline advertising
foundation
area_servedWorldwide
locationNew York City, United States
key_peopleMichael Rubenstein (president)
productsInfrastructure as a service
Ad serving
Analytics
num_employees1000+
parentXandr (2018-present)
::

| name = AppNexus Inc. | logo = | type = Subsidiary | industry = Online advertising | foundation = | area_served = Worldwide | location = New York City, United States | key_people = Michael Rubenstein (president) | products = Infrastructure as a service Ad serving Analytics | revenue = | operating_income = | net_income = | num_employees = 1000+ | owner = | parent = Xandr (2018-present) | subsid = | footnotes = | slogan =

Xandr, formerly known as AppNexus, is an American multinational technology company operating a cloud-based software platform that enables and optimizes programmatic online advertising. Headquartered in the Flatiron District of 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), 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. It operates out of multiple data centers, including one in Amsterdam serving Europe and the Middle East, in a facility shared with Equinix.

In June 2018, AT&T announced it was acquiring the company and putting it under its Xandr division as a subsidiary. AppNexus was reportedly sold for $1.6 billion, while most news outlets speculated the company did not sell for less than $2 billion.

In October 2019, Xandr purchased Clypd, a privately held technology company focused on enabling programmatic buying of linear television advertising.

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.

Founders and financing

AppNexus was founded by former Right Media staff, CTO Brian O'Kelley, and Mike Nolet, product manager and director of analytics, with Michael Rubenstein, a former vice president and general manager at Google DoubleClick, who 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. O'Kelley stepped down as CEO in October 2018.

References

References

  1. Stephanie Clifford. (2010-03-12). "Instant Ads Set the Pace on the Web". The New York Times.
  2. AppNexus. (2010-03-12). "AppNexus Officially Launches Ad Platform Fueling the Real-Time Bidding Revolution in Display Advertising". [[PR Newswire]].
  3. "AppNexus Expands Video Buying, Adds New Video Demand Partners".
  4. (25 June 2018). "AT&T to Acquire AppNexus".
  5. (2018-06-25). "AT&T Will Acquire AppNexus {{!}} AdExchanger". AdExchanger.
  6. (18 October 2019). "Xandr Acquired Clypt in Move to Build Connevted TV Empire".
  7. Foley, Mary Jo. (December 21, 2021). "Microsoft to buy Xandr ad marketplace from AT&T". [[ZDNet]].
  8. "Who We Are". AppNexus.
  9. [http://appnexus.com/documents/09-09-rubenstein-release.pdf] {{webarchive. link. (December 12, 2010)
  10. "AppNexus Secures $8 Million in Series B Funding". Pr-inside.com.
  11. [https://adexchanger.com/online-advertising/brian-okelley-steps-down-as-appnexus-ceo/ Brian O’Kelley Steps Down As AppNexus CEO] Published by adexchanger.com on October 5, 2018, retrieved on September 11, 2019
  12. Alex Conrad. (2013-08-04). "How AppNexus CEO Became the King of Ad Tech". Forbes.com.
  13. Liz Gannes. (2010-10-05). "AppNexus Raises $50M for Real-time Ad Platform: Tech News and Analysis «". Gigaom.com.
  14. "AppNexus's $75 Million Funding Round Quiets Acquisition, IPO Talk".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

2007-establishments-in-new-york-citypay-per-click-search-enginese-commerce-softwareonline-companies-of-the-united-statesamerican-companies-established-in-2007marketing-companies-established-in-2007online-advertising-services-and-affiliate-networksmass-media-companies-based-in-new-york-citymicrosoft-acquisitionsmicrosoft-subsidiaries2018-mergers-and-acquisitions