NutriSystem ( NTRI) was among the Nasdaq's losers Thursday, after the weight-loss system provider cut its quarterly outlook below Wall Street's expectations.

Shares were dropping 33.6% a day after the company said it expected competitive pressures, including a new weight-loss drug announced by rival GlaxoSmithKline ( GSK), to cut into third-quarter earnings. The Horsham, Pa.-based company forecast a profit of 62 cents to 66 cents a share on revenue of $188 million. The company earlier had predicted earnings of between 77 cents and 82 cents a share. Analysts polled by Thomson Financial were expecting a profit of 82 cents a share on revenue of $206.7 million. Shares were plummeting $15.98 to $31.59.

Dresser-Rand ( DRC) shares dropped 10.3%, due to lowered third-quarter and full-year operating income expectations stemming from a recent strike and sluggish aftermarket sales. The company, which supplies rotating equipment to the oil and gas industries, now anticipates third-quarter operating income between $32 million and $36 million, and full-year operating income of between $205 million and $225 million. The company had earlier predicted third-quarter income of between $62.5 million to $72.9 million, and full-year income of between $250 million and $270 million. Shares decreased $4.48 to $39.

Shares of Acuity Brands ( AYI) were down 6% after reporting revenue below Wall Street's forecast, despite in-line earnings. Net income in the fourth quarter rose 24% from a year earlier, to $51.5 million, or $1.16 a share. The home furnishings and fixtures company's EPS figure was impacted by a one-time charge of 2 cents a share, bringing it into line with analysts' expectation of $1.18 a share. The company reported net sales of $693.0 million, vs. $674.5 million in the year-ago period. Analysts expected revenue of $712.1 million. Shares fell $3.28 to $51.14.

Shares of Bemis ( BMS), a packaging maker, sank 4.5% Thursday after ratcheting down its 2007 outlook due to lower sales in the third quarter. The company now expects earnings of between 37 cents and 40 cents per share, compared with previous guidance of between 48 cents and 51 cents per share. Analysts forecast earnings of 48 cents per share. The company blamed lower sales in North America for the drop. Shares fell $1.32 to $28.37.

Marriot ( MAR) fell 4.6% on a disappointing earnings outlook for the fourth quarter and 2008, which the hotel chain blames on a decline in timeshare profits and a higher tax rate. The company said it expects a profit of between 61 cents and 63 cents a share in the fourth quarter, below the consensus estimate of 68 cents a share.

Marriott also said it expects 2008 full-year earnings of between $2.10 and $2.25 per share, lower than the average analyst forecast of $2.30 a share, according to Thomson Financial. Marriot was trading down $2.04 to $42.28.

On the winning side, Team Inc. ( TISI) upped its 2008 guidance, causing stock to jump 11.6%. The piping and vessel service company expects full-year earnings for the fiscal year ending May 31, 2008 to between $1.05 and $1.15 per fully diluted share, a 5% increase from Team's previous guidance. The stock was jumping $3.23 to $30.97.

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