The U.S. market for retail Ethernet ports grew 24% in 2012 as the rankings of top providers shifted amidst increased price competition and network expansion, according to Vertical Systems’ newly released U.S. Business Ethernet Leaderboard.

The top Business Ethernet providers, in rank order based on port share as of the end of 2012: AT&T, Verizon, tw telecom, CenturyLink, Cox, Level 3, XO, and Time Warner Cable. Port shares were calculated using the base of enterprise installations of Ethernet services, plus input from Vertical’s independent surveys of Ethernet providers. The Leaderboard threshold is four percent (4%) or more of billable port installations.
Other providers selling Ethernet services in the U.S. are segmented into two tiers as measured by port share. The first or Challenge Tier for 2012 includes the following eight companies (listed here in alphabetical order): Charter Business, Cogent, Comcast Business, Integra, Lightpath, Reliance Globalcom, Windstream (includes Paetec) and Zayo Group (includes AboveNet).
The second or Market Player tier covers other providers offering Ethernet services in the U.S. The Market Player tier includes the following companies (listed in alphabetical order): Alpheus Communications, American Telesis, Bright House Networks, BT Global, Cincinnati Bell, Consolidated Communications, EarthLink Business, Expedient, FairPoint, FiberLight, Fibertech, Frontier, Hawaiian Telecom, IP Networks, Lightower, LS Networks, Lumos Networks, Masergy, Megapath, NTT America, Orange Business, Sidera Networks, Spirit, Sprint, SuddenLink, TDS, US Signal, Virtela and others.
http://www.verticalsystems.com/prarticles/stat-flash-YE_2012_US_Leaderboard.html