Shares of Herbalife ( HLF) were among the NYSE's losers Friday, plunging 20% after the nutritional-supplement maker cut its sales guidance for 2007.

For the recently ended fourth quarter, Herbalife said it expects sales of $482.7 million to $484.7 million, in line with Thomson First Call's average analyst estimate of $488.3 million. The company expects earnings to be within its previously announced forecast of 52 cents to 55 cents a share.

Looking ahead, Herbalife lowered its 2007 sales growth forecast because of slower-than-expected growth in Mexico. The company expects sales to rise 6% to 10%, compared with an earlier projection of 10% to 15%. Herbalife still expects earnings of $2.40 to $2.47 a share for the year. Shares were trading down $7.95 to $31.35.

Global Payments ( GPN) sank 16% after the electronic-transaction processor offered a disappointing fiscal 2007 forecast. For the second quarter ended Nov. 30, the company earned $34 million, or 42 cents a share, up from $30.6 million, or 37 cents a share, a year earlier. Excluding certain charges, earnings were 44 cents a share, matching Wall Street's target. Revenue climbed to $260.7 million from $219.7 million, compared with analysts' forecast of $260 million.

For the full year, Global Payments forecast revenue of $1.06 billion to $1.07 billion, shaving the top end off its prior projected range of $1.06 billion to $1.08 billion. Analysts, on average, projected revenue of $1.07 billion. Global Payments backed its forecast for earnings of $1.79 to $1.85 a share, before expenses for stock options. Still, that guidance is below Wall Street's target of $1.87. Shares were trading down $7.78 to $41.27.

Shares of Lifepoint ( LPNT) slipped 2% after the hospital chain's 2007 forecast came in short of Wall Street's forecast. The company forecasts 2007 earnings of $2.42 to $2.52 a share, below analysts' mean estimate of $2.62. The company sees full-year revenue of $2.68 billion to $2.69 billion, which is in line with Wall Street's projections. Shares were trading down 57 cents to $32.99.

Dollar Tree Stores ( DLTR) rose 6% after the discount retailer said fourth-quarter sales are trending near the upper end of the company's forecast of $1.28 billion to $1.31 billion. Analysts predict sales of $1.29 billion for the quarter, which ends this month. Dollar Tree shares were adding $1.84 to $32.49.

Shares of Robbins & Myers ( RBN) rose 6% after the company posted improved first-quarter results and raised its guidance. The company swung to a profit of $10.6 million, or 62 cents a share, for the quarter ended Nov. 30, compared with a year-earlier loss of $29.7 million, or $2.02 a share. The results included a 19-cent one-time benefit. Sales jumped to $154.4 million from $139 million.

For the full year, Robbins & Myers predicts earnings of $2.10 to $2.30 a share, well above its earlier forecast of $1.70 to $1.90. The company predicts second-quarter earnings of 38 cents to 48 cents a share. Analysts expect earnings of 39 cents a share for the second quarter and $1.88 a share for the year. Shares were trading at $46.45, up $2.31.

The NYSE's volume leaders were Motorola ( MOT), down $1.65 to $18.90; Nokia ( NOK), down $1.18 to $19.74; Ford ( F), down 5 cents to $7.65; EMC ( EMC), unchanged at $13.53; AT&T ( T), down 5 cents to $34.45; Pfizer ( PFE), down 6 cents to $26.32; Exxon Mobil ( XOM), down 33 cents to $72.39; and Halliburton ( HAL), down 44 cents to $28.78.

Nasdaq's heaviest movers included Intel ( INTC), down 33 cents to $20.84; Cisco ( CSCO), down 29 cents to $28.17; Sun Microsystems ( SUNW), down 10 cents to $5.59; Sirius Satellite Radio ( SIRI), up 3 cents to $3.80; Yahoo! ( YHOO), up 52 cents to $27.37; Level 3 Communications ( LVLT), up 18 cents to $5.75; and Dell ( DELL), up 1 cent to $26.25.

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