Keurig biggest S&P 500 loser; BlackBerry extends losses
AT&T to buy back $10 billion worth of shares
SAN FRANCISCO (MarketWatch) — Keurig Green Mountain Inc. kicked off a new week on a weak note Monday while BlackBerry Ltd. continued to slide on disappointing quarterly sales.

Keurig Green Mountain (NASDAQ:GMCR) shares fell 2.5%. Stock analysis website Seeking Alpha profiled the stock, describing it as a volatility trade .

BlackBerry (NASDAQ:BBRY) shed 2.8% to $8.18. The smartphone maker said Friday its fourth-quarter loss narrowed but its revenue fell short of expectations. http://www.marketwatch.com/story/jj-sells-ort...2014-03-31