...February 27, 2023 AUSTIN (S&P Global Ratings) Feb. 27, 2023--S&P Global Ratings today said it has taken various actions on its fund credit quality ratings (FCQRs) and fund volatility ratings (FVRs) on 100 iShares fixed-income exchange-traded funds (ETFs). (See the Ratings List.) We raised one FCQR, lowered two, and affirmed 97. In general, changes in FCQRs, whether upgrades or downgrades, stemmed from changes in the constituents of the underlying indices and, consequently, gradual changes in the weighted average credit risk of the ETFs' portfolios of investments. The components of the underlying indices typically change over time depending on market conditions and issuance trends. We raised the FCQR by one notch on the BlackRock Short Maturity Bond ETF, an actively managed multisector ETF. We upgraded the fund despite it being affected by 2022's central bank monetary policy tightening. In our assessment, it remains in line with an 'Af' rating as a result of its defensive positioning via...