State Street Global Advisors, the Boston, MA-based second largest issuer of exchanged-traded products with $328 billion in ETF assets, has launched the SPDR Russell 2000 ETF (TWOK). TWOK is a small-capitalization company focused equity fund and is set to rival the iShares Russell 2000 ETF (IWM) and the Vanguard Russell 2000 ETF (VTWO). TWOK tracks the Russell 2000 Index, arguably …