The collaborative partnership of ASRS, BlackRock and MSCI was instrumental in developing the iShares MSCI Factor ETFs which institutional investors can use to implement risk factor investing more precisely. "The iShares MSCI Factor ETFs compliment iShares' suite of Minimum Volatility products and the iShares Enhanced ETFs can benefit from BlackRock research, portfolio implementation, and risk management expertise for our clients," said Patrick Dunne, Head of iShares Global Markets and Investments. He added, "The expansion of iShares Factor ETFs demonstrates how iShares has raised the bar of ETF development by working alongside clients. Increasingly we plan to develop products that are client-led to meet their most pressing portfolio challenges."The five ETFs began trading on April 18, 2013 on the NYSE Arca. Follow us on Twitter @ ETFguide