Renesys Market Intelligence found that Sprint was the fastest growing transit provider to European and South American autonomous systems in Q1 2006. They also had good growth in Asia, but were flat in North America.

Level 3 was the second-fastest growing transit provider to North American and European networks (behind MCI WorldCom and Sprint, respectively), and ranked in the top ten for growth in 93 countries worldwide.

MCI WorldCom (UUNet) had the fastest worldwide growth of the top 10 in the first quarter. They were the fastest growing ASN in North America and Asia, and second in South America. They led in the United States, Hong Kong, Malaysian, and Taiwanese markets, and they came in a very close second in China.

AT&T was the third fastest growing autonomous system in the US in the quarter, behind MCI WorldCom and Level 3, but their growth outside the US exhibits no particularly strong trends.

Verio had significant first-quarter growth in Japan, Australia, New Zealand, the Philippines, Taiwan, and Vietnam. Significantly, they're the largest transit provider in Asia, and the fourth-fastest growing, despite their minimal presence in China.

Teleglobe topped the growth list in Canada, France, and India, and had top ten growth in 63 different countries.