An expectation for increased acquisitions in health care has benefited small stocks.
Some stock investors are optimistic about the market's ability to move up in the face of loftier yields.
U.S. stocks rebounded in volatile afternoon trading on Tuesday, with major indexes up more than 1 percent.
Wall Street ended the week on a sour note as investors weighed the fate of the Republicans' tax overhaul.
Hospitals, health insurers among sectors with a lot of skin in the game.
The index slipped on earnings reports from high-profile names such as Amazon, Exxon and Starbucks.
After a slowdown, tech stocks may soon resume their outperformance.
Energy stocks were darlings last year, but have stumbled in 2017.
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