Updated from 11:41 p.m. EDT

Shares of Education Management ( EDMC) were among the Nasdaq's winners Thursday, rising 10.8% after the company posted third-quarter earnings above expectations and raised its full-year earnings outlook.

The for-profit education company posted earnings of $34.2 million, or 45 cents a share, on sales of $274.6 million. Analysts polled by Thomson First Call were expecting earnings of 41 cents a share on sales of $273.5 million. A year ago the company earned $25.4 million, or 34 cents a share, on sales of $235.2 million. Sales results were helped by a 12.1% increase in total student enrollment and by a 6% jump in average tuition rates. Looking ahead, Education Management now expects full-year earnings of $1.33 a share, up from previous guidance of $1.29 a share. Analysts had been expecting earnings of $1.29 a share. Shares traded up $2.67 to $27.51.

iVillage ( IVIL) fell 23.5% after the women's media company posted first-quarter results that fell below expectations and said it would post a loss during the second quarter as well. The company reported a loss of $1.3 million, or 2 cents a share, on sales of $17.3 million. Results include a loss of $600,000 related to its Healthology acquisition. Analysts were expecting the company to break even and post sales of $18.5 million. A year ago the company posted a loss of $900,000, or 1 cent a share, on sales of $15.5 million. Looking ahead, iVillage forecast a second-quarter loss of $500,000 to $1 million on sales of $20 million to $21 million. Analysts are expecting a profit of 3 cents a share on sales of $20.7 million. Shares traded down $1.61 to $5.23.

Shares of Arbinet-thexchange ( ARBX) fell 25.2% after the company posted first-quarter results that fell below expectations. The company, which provides an electronic market for trading, routing, and settling communications capacity, posted a profit of $1.3 million, or 5 cents a share, on fee revenue of $12.3 million. Analysts were expecting earnings of 10 cents a share on fee revenue of $13.6 million. Looking ahead, Arbinet reiterated its 2005 forecast that calls for earnings of $19 million to $23 million on fee revenue of $58 million to $64 million. Analysts are expecting earnings of 68 cents a share on fee revenue of $62.4 million. Shares traded down $4.72 to $13.99.

Dynamic Materials ( BOOM - Get Report) rose 27.1% after the company posted a 72% jump in first-quarter sales on a big increase in earnings. The metalworking company earned $1.6 million, or 28 cents a share, on sales of $17.5 million. A year ago the company earned $200,000, or 4 cents a share, on sales of $10.2 million. Last year's results included a $200,000 loss from discontinued operations. Without the loss, the company would have earned 8 cents a share. Shares traded up $7 to $32.85.

Shares of Mine Safety Appliances ( MSA - Get Report) rose 15.1% after the safety products company posted first-quarter results that were well above expectations. The company earned $21.4 million, or 57 cents a share, on sales of $228 million. Analysts were expecting earnings of 48 cents a share on sales of $222 million. A year ago the company earned $16.1 million, or 43 cents a share, on sales of $194.5 million. Results in the most recent period were led by solid sales in the company's North American segment, which benefited from strong shipments of advanced combat helmets to the U.S. military. Shares traded up $5.66 to $43.11.

NYSE volume leaders included Ford ( F), down 46 cents to $9.70; Lucent Technologies ( LU), down 6 cents to $2.58; General Motors ( GM), down $1.94 to $30.86; Calpine ( CPN), down 19 cents to $2.06; Tyco ( TYC), down 1 cent to $29.24; Exxon Mobil ( XOM), up 57 cents to $57.80; and Pfizer ( PFE), up 8 cents to $27.91.

Nasdaq volume leaders included Cisco Systems ( CSCO - Get Report), up 35 cents to $18; Sirius Satellite Radio ( SIRI), down 9 cents to $5.32; Intel ( INTC - Get Report), up 15 cents to $24.26; Microsoft ( MSFT), up 2 cents to $25.23; Oracle ( ORCL), down 6 cents to $11.66; Siebel Systems ( SEBL), down 32 cents to $9.21; Applied Materials ( AMAT), up 6 cents to $15.47; and Symantec ( SYMC), down 48 cents to $19.44.