iShares Trust - iShares Dow Jones U.S. Healthcare Sector Index Fund announced earnings results for the full year ended April 30, 2012. For the period, the company reported net investment income of $10,116,514 against $9,513,352 for the same period a year ago. Net increase in net assets resulting from operations was $34,972,609 against $83,579,493 for the same period a year ago.