US STOCKS-Wall St rises as small-caps rally; HP shares off late
* Hewlett-Packard's revenue misses Wall St estimates
* JD.Com soars in market debut, among Nasdaq's most actively traded
* Small-cap and "momentum" stocks outperform
* Dow up 0.1 pct; S&P 500 up 0.2 pct; Nasdaq up 0.6 pct (Updates to close)
By Angela Moon
NEW YORK, May 22 (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 $71.18, while Alexion Pharmaceuticals rose 2.5 percent to $160.48. The Nasdaq biotechnology index gained 1.9 percent. Shares of Salesforce.com , the world's biggest maker of online sales software, advanced 6.1 percent to $53.27.
The Russell 2000 index of small-cap shares rose 0.9 percent, outperforming the broader S&P 500. The Russell fell into correction territory last week - defined as a 10 percent decline from a recent closing high - but has since retraced some of that, and is now less than 8 percent from its peak. Continuación...