Russell 2000 adds 8 consumer staple stocks

Diamond Foods Inc., Lifeway Foods Inc., Omega Protein Corp., Schiff Nutrition International, Smart Balance Inc., Star Scientific Inc., Susser Holdings Corp. and Zhongpin Inc. were added in this year's reconstitution of the small stock index.

Jones Soda Co. and Tiens Biotech Group USA Inc were removed from the Russell 2000.

Tacoma, Wash.-based Russell Investments realigns the Russell 3000 index once per year, tracking what it maintains is 99 percent of the U.S. equity market. That index is then broken down to 26 smaller indexes, including the widely watched Russell 1000 index of large capitalization stocks and the Russell 2000 index of small capitalization stocks.

The makeup of the Russell indexes for the next 12 months was finalized after the closing bell Friday.