Here are the companies which comprise the Russell 2000 Index (as of June 25, 2015). The next reconstitution will take place in June 2016.
As a reminder the Russell 2000 is comprised of the next 2,000 largest companies in the Russell 3000. This is thought of as the mid-cap/small cap group. It represents approximately 10% of the total market capitalization of the Russell 3000.