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