STOXX Ltd., today announced its expanding collaboration with BlackRock, with iShares STOXX World Equity Multifactor UCITS ETF, iShares STOXX Europe Equity Multifactor UCITS ETF, iShares STOXX US Equity Multifactor UCITS ETF now tracking the STOXX Developed World Equity Factor Screened index, the STOXX Developed Europe Equity Factor Screened index, and the STOXX US Equity Factor Screened index respectively.