...NEW YORK (S&P Global Ratings) Oct. 26, 2017--S&P Global Ratings today said it assigned its 'B+f' fund credit quality rating (FCQR) and '##' fund volatility rating (FVR) to the iShares Broad USD High Yield Corporate Bond ETF. Given the fund is new and expected to launch soon, we have assessed the fund's respective index portfolio to determine the fund credit quality. The 'B+f' FCQR signifies that the credit quality of the fund's portfolio exposure is very weak. The iShares Broad USD High Yield Corporate Bond ETF seeks to track the investment results of an index composed of U.S. dollar-denominated, high-yield corporate bonds. The fund seeks to meet its investment objective generally by investing in individual securities that satisfy the criteria of the BofA Merrill Lynch U.S. High Yield Constrained Index. The components of the underlying index, and the degree to which the components represent certain industries, are likely to change over time. The underlying index consists of U.S. dollar-denominated,...