BlackRock Income Trust Inc is a closed ended fixed income mutual fund launched by BlackRock Inc The fund is managed by BlackRock Advisors LLC It invests in the fixed income markets of the United States The fund invests in securities of companies that operate across diversified sectors It invests in securities such as US government sponsored agency securities nonagency mortgagebacked securities assetbacked securities and US treasury obligations The fund invests its assets in securities that are issued or guaranteed by the US government or one of its agencies or instrumentalities or rated at the time of investment either AAA by SP or Aaa by Moodys BlackRock Income Trust Inc was formed on July 22 1988 and is domiciled in the United States