Herbalife, Medifast, Baidu are market movers

(AP) Stocks that moved substantially or traded heavily Wednesday on the New York Stock Exchange and Nasdaq Stock Market:

NYSE

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.

Nasdaq

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.