NEW YORK (S&P Global Ratings) Sept. 15, 2016--S&P Global Ratings today said it assigned its 'BBBf' fund credit quality and 'S3' fund volatility rating on the iShares iBonds Dec 2026 Corporate ETF. BlackRock Fund Advisors (BFA), the fund's investment adviser, is a subsidiary of BlackRock Inc. As of June 30, 2016, BlackRock's assets under management totaled more than US$4 trillion across equity, fixed income, cash management, alternative investment, real estate, and advisory strategies. State Street Bank&Trust Co. is the administrator, custodian, and transfer agent for the fund. BlackRock Investments LLC, a subsidiary of BlackRock Inc., is the fund's distributor. The fund will track an index composed of U.S. dollar-denominated, investment-grade securities publicly issued by U.S. and non-U.S. corporate