More than 50 companies in the health care sector were added to the Russell 2000 in this year's reconstitution of the small stock index, while 30 companies in the sector were removed from the index.

Five companies in the health care sector were added to the Russell 1000 in this year's reconstitution of the large stock index, while one stock in the sector was removed.

Medical technology company Hologic Inc. said Wednesday the Federal Trade Commission cleared its $580 million takeover of Third Wave Technologies Inc.

The continued surge in oil prices is starting to cut into economic growth--and with it, the slowly recovering stock market.

The Federal Reserve cut the fed funds rate by three-quarters of a point, to 2.25 percent. CNBC asked the experts how investors should adjust their portfolios. Here's what they said.