USIG holds a broad, neutral portfolio of US investment-grade corporates with at least one year remaining to maturity. The underlying index may invest in foreign issuers if they are USD-denominated and are issued in the US. Some of the securities excluded in the Index are hybrid securitized corporate bonds, Eurodollar bonds, taxable and dividends-received-deduction-eligible securities. The outstanding face value of the bonds should be USD 250 Million at minimum. The market-value-weighted index is updated monthly. Prior to August 1, 2018, the fund tracked the Bloomberg Barclays US Credit Bond Index.