The index tracks 40 of the largest and most actively traded Internet firms in the U.S. and was established in 1999 as a benchmark to measure companies that generate 50% or more of their revenues from the Internet. To be eligible to be included in the index, a company must have a three-month average market capitalization of at last $100 million.
Twenty-five of the companies are Internet services, while 15 are Internet commerce. The top three Internet services companies in the index currently are
"The Dow Jones Internet Composite Index is one example of the many niche markets we aim to represent with our index families," said Michael A. Petronella, president of