FlexShares, the tenth-largest US exchange-traded fund issuer better known for its suite of “smart-beta” and self-indexed funds, recently launched a US-focused fixed-income fund that puts the spotlight on the middle-maturity offerings. Northern Trust’s ETF-unit unveiled the FlexShares Credit-Scored US Corporate Bond Index Fund (SKOR), an intermediate-dated bond-fund that focuses on investment-grade corporate bonds with maturities ranging from two to 10 …