Wall St. rises as small-caps rally; HP shares off late
By Angela Moon NEW YORK (Reuters) – U.S. stocks ended higher for the second straight session on Thursday, led by small-cap stocks, while the Nasdaq climbed on a rally in biotech shares. The surge in biotech stocks extended the recent trend of volatile trading. Small-caps and the so-called momentum names in the Internet and biotech spaces have recently echoed the broader market's direction, but moved in an outsized fashion, often without specific news. Among momentum names, noted for high growth and perceptions of excessive valuation, Vertex Pharmaceuticals shares shot up 6 percent to $71. …