NEW YORK ( TheStreet) -- The Russell 2000 index edged up on Friday, allowing the small-cap benchmark to continue to pad its lead over the Dow Jones Industrial Average so far in 2010. October has been a stellar month for both indices but the Russell has outpaced the Dow, posting a gain of 4.1% to date vs. the blue-chip index's advance of 3.2%. On Friday, the Russell 2000 added 5.31 points, or 0.76%, to finish at 703.43. The Dow couldn't keep pace as it fell for the first time in three sessions, losing 14 points, or 0.1%, to close at 11,133. Those performances bring year-to-date returns to 13.6% for the Russell vs. the Dow's gain of 6.8% in 2010. The Russell 2000 is a market capitalization-weighted index constructed by Russell Investments, which says its Russell 3000 index represents 99% of U.S. equities. The Russell 1000 index includes the 1000 biggest companies, by market cap, and the Russell 2000 holds the next 2000 companies. Click here for a complete list of the Russell 2000's components. The index's top 5 weighted components as of Sept. 30 were Tibco Software ( TIBX), Riverbed Technology ( RVBD), Verifone Systems ( PAY), Rackspace Hosting ( RAX), and Nordson Corp. ( NDSN). The Russell indexes exclude any companies that trade over-the-counter or on the Pink Sheets, as well as companies whose shares trade for less than $1 each. For further information on the methodology and maintenance of the indexes, click here. Here's a list of the top five performers in the Russell 2000 in the past week with trailing three-month daily average volume of at least 50,000.