Stocks that moved substantially or traded heavily Wednesday on the New York Stock Exchange and Nasdaq Stock Market:
Herbalife Ltd., up $1.35 at $27.41
Shares of the nutritional supplements company rose after it said that it will hold an analyst day to discuss its business model.
Medifast Inc., down $3.86 at $25.50
The weight-loss company said that its acting chief financial officer is resigning, the second CFO to resign in less than two months.
Michael Kors Holdings Ltd., down $3.54 at $50.03
Shares of several retailers, including Michael Kors, fell after data from MasterCard found that holiday sales rose less than expected.
Rite Aid Corp., up 10 cents at $1.41
The drugstore chain's stock continued to rise after the company said last week that it filled more prescriptions in its third quarter.
Research In Motion Ltd., up $1.22 at $11.82
Shares of the BlackBerry maker rose after a sell-off. Shares began falling after it released its third-quarter results last week.
Netflix Inc., up 42 cents at $90.65
The TV and film streaming company said that its service is working again after some customers experienced a Christmas Eve outage.
Baidu Inc., up $4.68 at $101.45
Chinese news outlets reported that the Chinese search engine is getting ready to launch a voice search function for cellphones.
MannKind Corp., up 11 cents at $2.31
The biopharmaceutical company said in a government filing that its chief executive officer bought 40 million MannKind shares.