BlackRock Debt Strategies Fund, Inc. is a closed ended fixed income mutual fund launched by BlackRock, Inc. The fund is co managed by BlackRock Advisors, LLC and BlackRock Financial Management, Inc. It invests in the fixed income markets of the United States. The fund invests in a diversified portfolio of US companies' debt instruments, including corporate loans, which are rated in the lower rating categories of the established rating services (BBB or lower by S&P's or Baa or lower by Moody's) or unrated debt instruments, which are in the judgment of the investment adviser of equivalent quality. The fund was formerly known as Debt Strategies Fund Inc. BlackRock Debt Strategies Fund, Inc. was formed on March 27, 1998 and is domiciled in the United States.