NEW YORK -- Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and Nasdaq Stock Market:

NYSE

Amerigroup Corp., up $24.45 at $88.79

WellPoint Inc., the nation's second-largest insurer, said that it is buying the managed care provider for about $4.46 billion.

Boston Beer Co. Inc., down $8.12 at $116.27

A UBS analyst downgraded the brewer, which makes Samuel Adams beer, saying that he expects slower growth for the company.

LinkedIn Corp., down $5.88 at $102.98

Shares of the professional networking service fell after Facebook Inc. said it is working on its own jobs-listing service.

Bridgepoint Education Inc., down $7.25 at $14.25

The for-profit educator said a group that certifies schools denied an accreditation for Ashford University, the company's school.

Dollar Tree Inc., down $1.29 at $53

A Morgan Stanley analyst downgraded the discount retailer to the equivalent of "Sell," citing concerns about continued growth.

FTI Consulting Inc., down $1.70 at $27.43

The business advisory firm said that it is cutting 115 jobs, or about 3 percent of its workforce, to reduce its costs.

Nasdaq

Acme Packet Inc., down 49 cents at $15.25

Shares of the phone and data network equipment maker fell again after posting disappointing second-quarter guidance last week.

MELA Sciences Inc., up 20 cents at $3.36

The medical device company posted positive results from a German study of its MelaFind device which is used to detect skin cancer.