Stocks that moved substantially or traded heavily Wednesday on the New York Stock Exchange and Nasdaq Stock Market:
Dynegy Inc., down 17 cents at $5.62
The power company said it may have to seek bankruptcy protection if it can't meet certain earnings requirements by its creditors this year.
American Eagle Outfitters Inc., up 76 cents at $15.56
The teen retailer's net income rose 47 percent in its most recent quarter, and the CEO announced plans to retire amid takeover rumors.
Boston Beer Co. Inc., down $4.07 at $89.94
The brewer of Samuel Adams beer posted quarterly results that missed expectations, and said its investments may slow earnings growth in 2011.
Tyson Foods Inc., up 81 cents at $19.61
A Deutsche Bank analyst raised her rating and price target on the meat producer's shares because of improving sales and cost cuts.
Visteon Corp., down $6.81 at $66.89
The auto parts maker, a former unit of Ford Motor Co., posted a profit in its first quarter after emerging from bankruptcy protection.
Catalyst Health Solutions Inc., up $8.27 at $52.80
Catalyst is buying Walgreen's pharmacy benefits management business for $525 million, more than doubling the company's size.
Finisar Corp., down $15.43 at $24.61
The fiber optics components maker issued disappointing fourth-quarter guidance, pointing to slowing business in China.
The Children's Place Retail Stores Inc., up $4.44 at $48.32
Cost cuts at the children's clothing store chain impressed investors, offsetting declines in profit and revenue.