More than a year has passed since our last Ad Server Share report, so we thought it was time to reexamine the prominence of various ad servers in the market. Attributor analyzed those that monetize content across 270 million domains, which is nearly 75% more domains and pages covered than in previous studies, including a major uptick in international sites. With expanded domain tracking capabilities, we feel this is our most comprehensive ad server report yet. The result is that more ad networks were detected with higher precision.

In all, 37 ad networks were identified. The data was then combined with compete.com’s traffic data and its vertical site category classification to provide the unique user and content category breakdowns.

Key Findings:

• Google and DoubleClick overwhelmingly dominate the market. Combined they account for more than 65% of the market share, which, compared to the December 2008 report, is an increase of about 9%.
• Yahoo’s share has decreased by more than 5%, or half of its previous share from the December 2008 report.
• AOL and AudienceScience follow, beating both Yahoo and MSN.
• Between Google and DoubleClick, Google dominates the smaller sites (less than 1 million views) whereas their market share is about the same on the larger sites (more than 1 million views)
• AOL’s market share has increased partly due to its acquisition of Adtech. Adtech is quite strong on European websites (e.g. sky network sites including sky.com, skysports.com etc).
• AudienceScience is strong on news sites like CNN.com, USAToday.com, WashingtonPost.com, etc. In fact, on these news sites, AudienceScience is ahead of both Google and DoubleClick taken separately.



Market Share for Large Sites (Greater than 1 million unique users) – DoubleClick and Google dominate and about equal size; both combined capture 62% of the entire market. AOL and AudienceScience are ahead of both MSN and Yahoo.

Market Share for Small Sites (less than 1 million unique users) – Google dominates and captures about 50% of the entire market and combined with DoubleClick captures more than 70% of the market. MSN and Yahoo now behind AOL, AudienceScience, Value Click and Kontera.

Market Share Large Sites and Small Sites

*Above information in a tabular format for easy comparison purposes

Market Share for Auto Sites (as categorized by Compete) – DoubleClick dominates, but AudienceScience has 2% lead over Google.

Market Share for News Sites – AudienceScience dominates everyone including Google and Double Click.

Market Share for Shopping Sites (as categorized by Compete) – DoubleClick and Google dominate followed by Value Click and others.

Market Share for Blog Sites (as categorized by Compete) – Google and DoubleClick dominate followed by AOL and Kontera.

Market Share for Travel Sites (as categorized by Compete) – Google and DoubleClick dominate followed by MSN and AOL.

Note: We have data for other categories such as Health and Government (all categorized by Compete) and also Finance and Social Networks. All these categories demonstrate dominance of Google and Double Click. We can plot them if needed.

Methodology:

The methodology described below is the same as the previous studies from 2008 with the following execution improvements:

• More pages were processed (270 million as compared to 75 million) as a result of greater capacity and longer collection period.
• More Ad Networks were detected with higher precision.

Attributor analyzed the ad server calls across 270 million domains as part of its May 2009 – March 2010 crawling operations. There were 37 ad networks that could be identified. The data was then combined with compete.com’s traffic data and its vertical site category classification to provide the unique user and content category breakdowns. Each share total represents the sum of all ad networks owned by each company, with Google as the exception in which DoubleClick and AdSense are displayed separately. For example, Atlas DMT share is counted within Microsoft share numbers and Advertising.com is included in AOL share numbers. A full list of this breakdown is available on request.

We will continue to provide details and research about Ad Server statistics. For more information, contact info@attributor.com. To download the study in its entirety, click here.