SCHAUMBURG, Ill.--(BUSINESS WIRE)--Sparton Corporation (NYSE: SPA) announced that it has joined the Russell 2000® Index according to the list posted July 1, 2013 on www.russell.com. The Russell 2000 Index measures the performance of the small-cap segment of the U.S. equity universe. The Russell 2000 is a subset of the Russell 3000® Index representing approximately 10% of the total market capitalization of that index. It includes approximately 2000 of the smallest securities based on a combination of their market cap and current index membership. Membership in the Russell 2000 Index, which remains in place for one year, means automatic inclusion in the appropriate growth and value style...
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