Top 13 ISP's of 2009

In 2009, Level 3 pulled away from largely stagnant Sprint, opening up a roughly 12% lead. In the spring of 2009, Level 3 gained nLayer (AS 4436) as a customer, which Renesys ranks as #12 in the US, thereby giving Level 3 a substantial boost in score.

http://www.renesys.com/blog/