Search company, investor...
AppNexus company logo


Founded Year



Acquired | Acquired

Total Raised






About AppNexus

AppNexus is a technology company that provides trading solutions and powers marketplaces for Internet advertising. Its open, unified, and programmatic platform empowers customers to more effectively buy and sell media, allowing them to innovate, differentiate, and transform their businesses.

Headquarters Location

28 West 23rd St 4th Floor

New York, New York, 10010,

United States


Missing: AppNexus's Product Demo & Case Studies

Promote your product offering to tech buyers.

Reach 1000s of buyers who use CB Insights to identify vendors, demo products, and make purchasing decisions.

Missing: AppNexus's Product & Differentiators

Don’t let your products get skipped. Buyers use our vendor rankings to shortlist companies and drive requests for proposals (RFPs).

Research containing AppNexus

Get data-driven expert analysis from the CB Insights Intelligence Unit.

CB Insights Intelligence Analysts have mentioned AppNexus in 1 CB Insights research brief, most recently on Mar 22, 2022.

Expert Collections containing AppNexus

Expert Collections are analyst-curated lists that highlight the companies you need to know in the most important technology spaces.

AppNexus is included in 2 Expert Collections, including Ad Tech.


Ad Tech

3,695 items


Targeted Marketing Tech

425 items

This Collection includes companies building technology that enables marketing teams to identify, reach, and engage with consumers seamlessly across channels.

AppNexus Patents

AppNexus has filed 1 patent.

The 3 most popular patent topics include:

  • Social networking services
  • Data management
  • Database management systems
patents chart

Application Date

Grant Date


Related Topics




Transaction processing, Social networking services, Promotion and marketing communications, Domain name system, Financial markets


Application Date


Grant Date



Related Topics

Transaction processing, Social networking services, Promotion and marketing communications, Domain name system, Financial markets



Latest AppNexus News

Can Scope3’s adtech execs tame the carbon emissions they once helped create?

Oct 12, 2022

October 12, 2022 | 7 min read Listen to article 4 min Adtech veteran Anne Coghlan explains how her latest gig Scope3 will help decarbonize the opaque industry her and co-founder Brian O’Kelley helped build. Scope3 helps decarbonize adland by estimating the grams of carbon emitted by digital display and video ads There’s a swelling of marketers who want to offset the carbon footprint of their media buys, but the tools remain in their infancy and platforms are still slow to offer the true picture . Enter Scope3, the brain-child of AppNexus alumni Anne Coghlan and Brian O’Kelley, which launched in 2022 to help decarbonize adland by estimating the grams of carbon emitted by digital display and video ads. And there’s more on the way. It’s a departure from the career path Coghlan initially set out on. She joined AppNexus in 2015, three years before the $1.6bn buyout by AT&T, as a product strategist. Her role was to take over the work the likes of O’Kelley did in building pre-bid and more. She jokes that they are responsible “for creating a lot of the complexities that we live with to this day.” She says at the time of building out AppNexus, there was little consideration around sustainability or energy consumption. For publishers in particular, there was a gold rush to add as many partners as possible to prop up real journalism and content languishing during the switch from print to digital. “No one was really thinking about the carbon footprint. We realize now that a lot of decisions were made without considering the environmental impact. They are now a problem. There’s a lot of waste and inefficiency in the ecosystem, not just from a money perspective and a lack of transparency, but also for the environment.” After the AppNexus buy-out (AT&T later sold it to Microsoft), Coghlan left the ad industry and joined Waybridge, a supply chain technology company, where she was challenged to understand the carbon expenditure in everything from mining, transport and smelting to shipping and more. It wasn’t entirely dissimilar from the issue plaguing adtech. Advertisement “It was about this time last year that we started applying this thinking to the world of programmatic, asking how many players are involved in the serving of one ad, not just the winners, but every single company involved in the losing bids using even a tiny bit of electricity,” she says. It’s all “inherently connected” from the brand to the publisher via a slate of adtech intermediaries, says Coghlan, who believes the first step is in measuring the carbon footprint of any given brand/agency’s digital activity, then incentivizing brands to buy accredited green media products (GMPs). “Once brands realize that advertising is part of their carbon cost, they will put pressure on their supply chain. Brands are answerable to the board, but also consumers, who are starting to be a bit more scrutinizing.” But if programmatic advertising is indeed so wasteful, why don’t brands just stop using it? “Advertising does have positive impacts,” she says, adding that the behavior changes we need to save the world can be pushed by this apparatus.“There is also a natural correlation between having fewer ads and fewer emissions overall, [so we should seek] higher quality or more effective ads.” Her first port of call would be removing made-for-advertising sites from the media plan, which are by their very nature crammed with ads generated (often) for bot traffic. “They’re terrible for the environment – I think we will see many positive effects from focusing on quality instead.” So she’s giving a pass to digital advertising – but what about the less intensive contextual advertising v audience-based targeting? Any media buyer worth their salt will know the content types their audiences will be likely to engage with. But that’s a simplistic view, and contextual advertising needs to prove itself as a worthy successor. If the untargeted inventory is less effective, agencies will likely buy more to make up for the deficit. “This is something we are researching at the moment. In the third-party cookie world, the user is pinging lots of different companies to make sure that they’ve got all the information centralized on one user. That is extremely carbon intensive, just by virtue of the number of computers and servers involved. There are lots of processes that happen in the audience-based targeting that are under threat anyway, so people have been moving away from that and moving towards contextual advertising ever since I left adtech in 2019.” At 15 staff on the books, Scope3 is set to scale up fast. Its “aggressive” roadmap will see it extend to all digital channels by the midpoint of 2023. She concludes: “We have to go big because there isn’t an option to go home if we don’t sort this out. We need to reduce those emissions as quickly as possible.”

AppNexus Frequently Asked Questions (FAQ)

  • When was AppNexus founded?

    AppNexus was founded in 2007.

  • Where is AppNexus's headquarters?

    AppNexus's headquarters is located at 28 West 23rd St, New York.

  • What is AppNexus's latest funding round?

    AppNexus's latest funding round is Acquired.

  • How much did AppNexus raise?

    AppNexus raised a total of $394.17M.

  • Who are the investors of AppNexus?

    Investors of AppNexus include AT&T, Z Holdings, News Corp, WPP Digital, Silicon Valley Bank and 15 more.

  • Who are AppNexus's competitors?

    Competitors of AppNexus include MediaMath and 2 more.

Compare AppNexus to Competitors

OpenX Software Logo
OpenX Software

OpenX is a global provider in digital and mobile advertising technology. OpenX's vision is to unleash the full economic potential of digital media companies. OpenX products, including OpenX Enterprise, OpenX Market, OpenX Lift and JumpTime provide a unique Software-as-a-Service platform by combining ad serving, an ad exchange, a Supply Side Platform and content valuation.

MediaMath Logo

MediaMath helps marketers in different countries deliver relevant and meaningful ads across channels, formats and devices. Its technology determines in real-time how to support marketers' goals so they deliver better outcomes for their businesses and personalized experiences for their customers. MediaMath was founded in 2007 and is based in New York, New York.

NextRoll Logo

NextRoll, formerly AdRoll, provides digital marketing services. The company offers marketing platforms to create personalized, digital campaigns, and APIs for businesses to build their own marketing products.

StackAdapt Logo

StackAdapt is a self-serve programmatic advertising platform. The company's solution for in-stream responsive ads is built to address the realities of a modern web that banner ads have never solved.

ViralGains Logo

ViralGains is building the first global exchange for viral video. Since 2012, ViralGains has been on a mission to create authentic relationships between advertisers and customers through online video. ViralGains works with ad agencies, brands, and YouTube stars to get their videos watched and shared by the right audiences. Praxis, ViralGains' video ad platform, integrates targeting by thousands of human attributes, ad placements on native and social environments, and real time reporting capability to generate positive returns on marketing investment. ViralGains is headquarted in Boston, MA and is actively expanding to New York, Chicago, and Southern California.

Basis Technologies Logo
Basis Technologies

Basis Technologies is creating a platform to make digital advertising easier. Its enterprise-class software centralizes, organizes, and automates all digital media campaigns across all channels, accessing both guaranteed and biddable inventory, to achieve any objective. The company's holistic approach gives marketers a single system of record to fulfill their research, planning, buying, optimization, reporting, and reconciliation needs. Since 2001, Centro has successfully planned and executed nearly 200,000 campaigns across all digital display platforms and ad format types.

Discover the right solution for your team

The CB Insights tech market intelligence platform analyzes millions of data points on vendors, products, partnerships, and patents to help your team find their next technology solution.

Request a demo

CBI websites generally use certain cookies to enable better interactions with our sites and services. Use of these cookies, which may be stored on your device, permits us to improve and customize your experience. You can read more about your cookie choices at our privacy policy here. By continuing to use this site you are consenting to these choices.