BlackRock Health Sciences Trust is a closedended equity mutual fund launched by BlackRock Inc The fund is managed by BlackRock Advisors LLC It invests in the public equity markets of the United States The fund seeks to invest in stocks of companies operating in the health sciences and related sectors which include businesses involved in researching developing producing distributing or delivering medical dental optical pharmaceutical or biotechnology products supplies equipment or services It also invests through equity derivatives with an emphasis on option writing The fund benchmarks the performance of its portfolio against the Russell 3000 Healthcare Index BlackRock Health Sciences Trust was formed on March 31 2005 and is domiciled in the United States