NEW YORK Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:
KB Home, up $1.28 at $18.19
Citigroup removes its "Sell" rating on the homebuilder, citing a recovery in earnings.
Darden Restaurants Inc., up $3.26 to $54.35
Activist investor Starboard Value disclosed a sizeable stake in the restaurant operator and is expected to push for a breakup.
Apple Inc., up $21.07 to $570.09
The tech giant announced a long-anticipated agreement with China Mobile to bring the iPhone to the world's biggest phone company.
Facebook Inc., up $2.65 at $57.77
The social networking company's shares hit a new all-time high, helped by a bullish note from a Cantor Fitzgerald analyst.
Ariad Pharmaceuticals Inc., up 57 cents to $7
The drugmaker jumps for the second consecutive day after getting regulatory approval to put its leukemia drug back on the market.
YRC Worldwide Inc., up $3.28 to $18.25
The trucking company reached a deal to cut its debt by about $300 million.
Skullcandy Inc., up 71 cents to $6.75
Roth Capital Partners upgrades the audio company, believing that initiatives by new management are starting to pay off.
United Therapeutics Corp., up $26.67 to $114.51
Regulators approved the drugmaker's treatment for high blood pressure, Orenitram, which was a surprise to some market analysts.