FlexShares Disciplined Duration MBS Index Fund (FlexShares Disciplined Duration) ETF

The underlying index reflects the performance of a selection of investment-grade U.S. agency residential mortgage backed pass-through securities. The fund generally will invest under normal circumstances at least 80% of its total assets (exclusive of collateral held from securities lending) in the securities of the underlying index and in "TBA Transactions" that represent securities in the underlying index.