Stocks that moved substantially or traded heavily on Thursday:
Biogen Inc., down $93.71 to $226.88
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The biotechnology company is ending development of a potential Alzheimer's disease drug after concluding it will be ineffective.
Guess Inc., down $2.76 to $19.31
The clothing retailer's fourth-quarter profit fell short of Wall Street expectations and it issued a weak forecast for the year.
G-III Apparel Group Ltd., up $3.91 to $39.07
The owner of Calvin Klein and other fashion brands gave investors a better-than-expected profit forecast.
Williams-Sonoma Inc., up $2.37 to $59.22
The seller of cookware and home furnishings beat Wall Street's profit and revenue forecasts for the fourth quarter.
Darden Restaurants Inc., up $7.46 to $116.11
The operator of Olive Garden restaurants beat Wall Street's fourth-quarter profit and revenue forecasts.
Raven Industries Ltd., down $3.43 to $35.16
The industrial products maker's fourth-quarter profit fell far short of analysts' expectations.
Micron Technologies Inc., up $3.86 to $43.99
The chipmaker beat Wall Street's profit and revenue forecasts and issued a solid outlook for memory chip sales.
Conagra Brands Inc., up $2.92 to $25.82
The packaged food company beat third-quarter profit forecasts thanks to higher prices for some of its products.