AT&T Drives Most Internet Traffic for U.S. Businesses in September 2011

Competition Among Business Internet Service Providers (ISPs) Increases as Size of Business Decreases

RESTON, VA, November 14, 2011 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released an analysis of Internet Service Provider (ISP) market share within businesses across the United States. Among its findings, the study showed AT&T leading the U.S. business ISP market with 20 percent of all browser-based Internet page views (i.e. traffic) in September 2011, followed by Verizon with a 12-percent share of the market. CenturyLink, which merged with Qwest in April 2011, ranked as the third largest business ISP at 7 percent share. The five largest business ISPs drove nearly 50 percent of business Internet traffic across the U.S.

“The current state of the domestic business ISP market reveals a landscape led by a couple of top providers. However, even with smaller carriers contributing only a fraction of the traffic delivered by top carriers, the business ISP market is still more competitive than the residential ISP market,” said Greg Mishkin, Comscore Vice President of Telecom and Wireless. “The small business segment is even more competitive among ISPs, highlighting the need for providers to develop strong marketing strategies to ensure they can retain and grow market share.”

Business ISPs See Increased Competition When Catering to Smaller Businesses

A more detailed look into the business ISP market according to the size of businesses being served also reveals AT&T to be the leading business ISP in the large, medium and small business segments. In addition, the top five ISPs accounted for nearly 70 percent of all traffic in the large business segment in September 2011, showing a high concentration of the top providers. In contrast, the share of traffic driven by the top five ISPs was significantly lower within the medium (56 percent) and small business (40 percent) segments.

The small business segment has proven to be the most competitive for business ISPs, with nearly 40 percent of traffic driven by ISPs that rank outside of the top ten carriers for this segment. While AT&T continues to lead all ISPs for small businesses, its 13-percent market share is significantly lower than its share in the large and medium business segments. Comcast (8 percent) and Verizon (7 percent) rounded out the top three ISPs in the small business segment.

*Based on the number of employees per business

AT&T and Verizon Lead Among Business ISPs in the Top Ten U.S. Local Markets

An analysis of the top ten U.S. local markets shows AT&T holding the top position in the majority of these markets in September 2011. Verizon led in 3 of the top 10 markets, including New York, the country’s largest local market. Similar to what was observed at the national level, the competition for business ISPs increases among smaller businesses. In the small business segment, Comcast and AT&T each ranked as the top ISP in 4 of the top 10 local markets, while Verizon and Cablevision each led in one local market.

*Based on the number of employees per business

AT&T Drives Approximately 30 Percent of Financial Services and Healthcare Business Internet Traffic

An analysis of the business ISP leaders for different industries revealed AT&T drove approximately 30 percent of traffic in the Financial Services and Healthcare and Medical industries in September 2011, showing a notable lead over other ISPs. In contrast, the Telecommunications and Software and Technology industries showed greater market fragmentation among business ISPs, with the leading providers driving less than one-fifth of traffic in these markets, followed closely by their competitors. Verizon and CenturyLink/Qwest ranked among the top three business ISPs for several industries as well.

About Comscore

Comscore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital business analytics. For more information, please visit www.comscore.com/companyinfo.

Contact:
Carmela Aquino
Comscore, Inc.
press@comscore.com