Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:
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Noble Energy Inc., down $3.05 to $46.07
The energy company will pay about $2.1 billion for Rosetta Resources in a deal that will give it access to two Texas shale formations.
Actavis PLC, up $8.92 to $301.74
The drugmaker said that its $66 billion purchase of Botox maker Allergan helped boost its revenue 59 percent in the last quarter.
Dean Foods Co., up $1.05 to $17.33
The milk producer and distributer reported adjusted earnings for its first quarter that beat Wall Street expectations.
Sotheby's, up 63 cents to $44.34
Thanks to stronger demand for art, the auction house posted adjusted earnings and revenue that beat Wall Street expectations.
Zulily Inc., up 69 cents to $13.98
Chinese e-commerce powerhouse Alibaba disclosed last week that it bought a more than 9 percent stake in the online retailer.
Monster Beverage Corp., up $5.54 to $134.01
A Citi analyst gave the energy maker's stock a "Buy" rating, saying that it may grow its market share and expand around the world.
Dish Network Corp., down 48 cents to $66.38
The satellite television provider said that it continued losing subscribers in the first quarter, even as its net income doubled.
RadNet Inc., down $1.24 to $7.55
The operator of medical diagnostic imaging centers reported a loss of $4.6 million in its first quarter.