NEW YORK (AP) -- Stocks that moved substantially or traded heavily Friday on the New York Stock Exchange and the Nasdaq Stock Market:
GameStop Corp. up $1.48 at $39.01
An Oppenheimer analyst upgraded shares of the video game retailer, saying that forthcoming video game consoles should boost sales.
Elan Corp. PLC up $1.05 at $13.66
The drugmaker said that it will explore a possible sale of itself after fending off several takeover bids from Royalty Pharma.
Nautilus Inc. down 27 cents at $7.98
The health equipment company said that its chief financial officer has resigned and it has started a search for a replacement.
American Superconductor Corp. down 30 cents at $2.35
The wind turbine component maker said its fourth-quarter loss narrowed on lower costs, but revenue fell as well.
Casey's General Stores Inc. down $2.60 at $60.69
The convenience store reported a slight uptick in its fiscal fourth-quarter profit despite softer sales and heavy charges.
Smith & Wesson Holding Corp. up 48 cents at $9.78
The gun maker said that strong sales will help the company beat Wall Street expectations for the fourth quarter.
Groupon Inc. up 79 cents at $7.65
A Deutsche Bank analyst upgraded shares of the online deals company, saying that it is likely to grow because of its mobile app.
Nutrisystem Inc. up 65 cents at $10.10
The weight-loss company said that it will start selling its dieting kits in 3,700 Walmart stores.
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