Shares of

Copart

(CPRT) - Get Report

were among the

Nasdaq's

winners Thursday, rising 9% after the vehicle-salvage company posted better-than-expected fourth-quarter results.

For the period ended July 31, the company posted earnings from continuing operations of $30.8 million, or 33 cents a share, on revenue of $137.2 million. Analysts polled by Thomson First Call expected earnings of 29 cents a share and revenue of $130.4 million. In the year-earlier quarter, Copart earned $25.1 million, or 27 cents a share, on revenue of $110.6 million. Shares were trading up $2.37 to $29.91.

Shares of

Ameristar Casinos

(ASCA)

jumped 11% after the casino operator lifted its third-quarter earnings projection. The company estimates earnings of 35 cents to 36 cents a share, up from an earlier view of 27 cents to 29 cents a share. Analysts project earnings of 29 cents a share. The company expects to post operating income of $43 million to $44 million, up from an earlier forecast of $36 million to $38 million. Ameristar plans to issue third-quarter results on Oct. 25. Shares were trading up $2.50 to $24.68.

Acuity Brands

(AYI) - Get Report

rose 2% after the lighting and chemicals company posted fourth-quarter results that beat Wall Street expectations. For the period ended Aug. 31, the company earned $41.4 million, or 93 cents a share, on revenue of $674.5 million. Analysts expected earnings of 85 cents a share and a top line of $644 million. A year earlier, the company earned $27.8 million, or 61 cents a share, on revenue of $597.2 million.

Looking ahead, Acuity said it is "cautiously optimistic" about its financial performance for fiscal 2007. "We expect that the rebound in nonresidential construction, our primary market, will continue throughout 2007 and that our revenue growth will again outpace the overall rate of growth in the market due to our continued focus on service, quality and new-product innovations, as well as our disciplined approach to pricing," Acuity said. Shares were adding 83 cents to $47.89.

Shares of

Marriott International

(MAR) - Get Report

rose 4% after the hotel operator posted better-than-expected third-quarter earnings. For the period ended Sept. 8, the company earned $141 million, or 33 cents a share, on revenue of $2.7 billion. Excluding its synthetic-fuel business, the company earned $144 million, or 34 cents a share. Analysts expected earnings of 30 cents a share on revenue of $2.8 billion. During the year-earlier quarter, the company earned $149 million, or 32 cents a share, on revenue of $2.71 billion.

Marriott forecast fourth-quarter earnings, excluding its synthetic-fuels business, of 46 cents to 51 cents a share. Analysts project earnings of 47 cents a share. Shares were up $1.68 to $40.01.

DynCorp International

(DCP) - Get Report

slid 7% after the defense contractor cut its full-year revenue outlook. For the full year ending March 30, 2007, the company expects revenue of $2.1 billion to $2.2 billion. Previously, the company forecast revenue of $2.4 billion. Analysts project revenue of $2.35 billion. The company continues to see full-year adjusted earnings of 71 cents a share. DynCorp said the revised outlook was based on its backlog and management's estimate of future contract awards. Shares were trading down 78 cents to $10.62.

Shares of

Kopin

(KOPN) - Get Report

tumbled 6% after the maker of liquid-crystal displays slashed its third-quarter revenue projection. Kopin expects revenue of $14 million to $15 million, well below its earlier forecast of $19 million to $20.5 million. The company said the revision is the result of a recent design improvement incorporating the company's microdisplay technology. The move required the display module to go through additional testing, which delayed product shipments. Kopin expects the revenue to shift into the fourth quarter. Shares recently changed hands at $3.24, down 22 cents.

NYSE

volume leaders included

Qwest

(Q)

, down 34 cents to $8.36;

McDonald's

(MCD) - Get Report

, down 3 cents to $39.97;

Ford

(F) - Get Report

, down 23 cents to $8.33;

AT&T

(T) - Get Report

, down 48 cents to $31.90;

Lucent Technologies

( LU), down 1 cent to $2.35;

Micron Technology

(MU) - Get Report

, down 40 cents to $17.68;

Sprint Nextel

(S) - Get Report

, up 6 cents to $17.41; and

Texas Instruments

(TXN) - Get Report

, down 51 cents to $31.65.

Nasdaq volume leaders included

Microsoft

(MSFT) - Get Report

, down 9 cents to $27.85;

Sun Microsystems

(SUNW) - Get Report

, down 5 cents to $4.96;

Intel

(INTC) - Get Report

, down 14 cents to $20.68;

Cisco Systems

(CSCO) - Get Report

, down 4 cents to $23.89;

Oracle

(ORCL) - Get Report

, up 3 cents to $18.20;

Apple Computer

(AAPL) - Get Report

, up 18 cents to $75.56;

Starbucks

(SBUX) - Get Report

, up $1.79 to $37.75; and

Sirius Satellite Radio

(SIRI) - Get Report

, up 1 cent to $3.95.