Stock index consisting of the 3000 largest publicly listed U.S. companies,
representing about 98% of the total capitalization of the entire U.S. stock market.
Different subsets of the Russell 3000 are also popular indexes:
- Russell 1000 (large caps):
the 1000 largest companies in the Russell 3000;
- Russell 800 (mid caps):
the smallest 800 companies in the Russell 1000;
- Russell 2000 (small caps):
the smallest 2000 companies in the Russell 3000.
See the index funds overview,
and the website of The Frank Russell Company.