PASADENA, Calif.--(BUSINESS WIRE)--Arrowhead Research Corporation (NASDAQ: ARWR) today announced that it will join the Russell Microcap® Index when Russell Investments reconstitutes its family of U.S. indexes, according to a preliminary list of additions posted June 11 on www.russell.com. The final 2010 reconstitution of the Russell Indexes will take place after the market closes on June 25, 2010 and final membership lists will be posted on June 28 at: http://www.russell.com/Indexes/membership/default.asp.
