Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and Nasdaq Stock Market:
Nationwide Health Properties Inc., up $3.78 at $42.74
Ventas Inc. is buying the health care real-estate investment trust in a stock deal valued at $5.8 billion _ a 15 percent premium to Nationwide's shares.
Humana Inc., up $2.41 at $65.01
Several analysts were upbeat about the health insurer's shares after the company raised its 2011 profit forecast and said it won a military contract.
Medicis Pharmaceutical Corp., up $6.27 at $32.09
A deal with Teva Pharmaceuticals will help protect the drug company's core acne treatment Solodyn from generic competition until 2018, analysts said.
Salesforce.com Inc., down $6.56 at $132.27
An investing column in The Wall Street Journal questioned whether the cloud computing company's stock was too expensive given its rising costs.
Berkshire Hathaway Inc., up $2.41 at $87.28
Warren Buffett's holding company posted strong fourth-quarter results and is searching for big acquisitions.
Kenneth Cole Productions Inc., down 98 cents at $13
The clothing and accessories maker said its CEO was leaving, effective immediately, and chairman Kenneth Cole would serve as interim CEO.
Amazon.com Inc., down $3.95 at $173.29
A UBS analyst downgraded the online retailer, saying its new video streaming service will increase costs and weigh on profit margins.
True Religion Apparel Inc., down $1.30 at $23.77
An FBR Capital Markets analyst downgraded the clothing company's investment rating, saying the stock is fairly valued after Friday's rally to a seven-month high.