Apple, Bed Bath & Beyond, Stec are big movers

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

NYSE

Tenet Healthcare Corp., up $1.88 at $43.73

The hospital operator plans to buy rival Vanguard Health Systems Inc. for about $1.8 billion. The deal will expand Tenet's reach.

Bed Bath & Beyond Inc., down $1.59 at $68.40

A Jefferies analyst kept his "Hold" rating on the home goods retailer, saying that falling profit margins may hurt its stock.

Abercrombie & Fitch Co., down $2.49 at $43.46

A Wedbush analyst said in a note to clients that despite deep discounts on the teen retailer's clothing, it isn't selling well.

Nasdaq

Apple Inc., down $10.96 at $402.54

A Jefferies analyst cut his price target for the iPhone maker's stock by $15 to $405, saying it may have cut iPhone production.

Keynote Systems Inc., up $6.31 at $19.82

Keynote, which monitors company websites, said it will sell itself to a private equity firm for about $369 million in cash.

Hercules Offshore Inc., up 38 cents at $6.83

The offshore drilling company bought a majority stake in Discovery Offshore and will sell its Domestic Liftboat assets for about $54 million.

Breitburn Energy Partners LP, down 55 cents at $17.36

The energy company said that it will acquire interests in a pair of oil fields for about $860 million from Whiting Petroleum Corp.

Stec Inc., up $3.12 at $6.71

Western Digital Corp. said that one of its subsidiaries has agreed to buy Stec, the data storage device maker, for about $320.7 million.