Shares of

Under Armour

( UARM) were among the

Nasdaq's

winners Wednesday, surging 18% after the maker of athletic clothing posted first-quarter earnings that more than doubled Wall Street's projection.

Under Armour earned $8.7 million, or 18 cents a share, on revenue of $87.7 million. Analysts polled by Thomson First Call expected earnings of 7 cents a share on revenue of $72 million. During the year-earlier quarter, the company earned $2.5 million, or 5 cents a share, on revenue of $58.2 million. "These results reflect the rapidly accelerating strength of the Under Armour brand," the company said. "The significant increase in profitability highlights our focus on driving bottom line results through operational excellence as our revenues continue to grow rapidly."

For the second quarter, Under Armour sees earnings of $250,000 to $750,000 and revenue of $70 million to $75 million. The company said it plans to increase marketing spending during the second quarter to support its footwear launch. Analysts project earnings of 3 cents a share on revenue of $60.8 million. Shares were trading up $5.78 to $38.49.

Cheesecake Factory

(CAKE) - Get Report

shares fell nearly 9% after the restaurant operator posted weaker-than-expected first-quarter results. The company earned $19.3 million, or 24 cents a share, on revenue of $306.4 million. Analysts expected earnings of 25 cents a share and revenue of $316.4 million. A year earlier, the company earned $19 million, or 24 cents a share, on revenue of $268.2 million. "In addition to the timing of two holidays, our revenues in the first quarter were impacted, like many in the restaurant industry, by a general softness in traffic in several geographic areas," the company said. Shares were down $2.98 to $32.08.

Shares of

Louisiana-Pacific

(LPX) - Get Report

rose 5% after the building materials company's first-quarter results easily beat expectations. The company earned $84.9 million, or 80 cents a share, on revenue of $678.3 million. Wall Street expected earnings of 52 cents a share, with revenue of $621.5 million. In the year-earlier quarter, Louisiana-Pacific earned $105.1 million, or 95 cents a share, on revenue of $661.4 million. "Sales volumes were higher in most of our product lines as our sales force was able to capitalize on the strategic investments we have made to increase capacity over the last several years and continued healthy demand for our building products," the company said. Shares were up $1.25 to $27.79.

Zebra Technologies

(ZBRA) - Get Report

slumped 10% after the maker of printers posted lower-than-expected first-quarter results and warned that second-quarter earnings also would be below forecasts. The company earned $26.1 million, or 37 cents a share, on revenue of $175.8 million. Analysts expected earnings of 39 cents a share on revenue of $180.2 million. During the year-earlier quarter, the company earned $25.8 million, or 36 cents a share, on revenue of $170.7 million.

Looking ahead, Zebra sees second-quarter earnings of 34 cents to 39 cents a share, below analysts' forecast of 42 cents. The company projects revenue of $180 million to $190 million, in line with analysts' prediction of $188.8 million. Shares were trading down $4.29 to $39.06.

Shares of

Manitowoc

(MTW) - Get Report

jumped 10% after the maker of heavy-lifting equipment posted better-than-expected first-quarter results. The company earned $29.7 million, or 48 cents a share, on revenue of $633 million. Earnings from continuing operations came in at $29.2 million, or 47 cents a share, beating analysts' target of 40 cents. Revenue totaled $633 million, above Wall Street's projection of $607.1 million. During the year-earlier quarter, the company reported earnings from continuing operations of $11.3 million, or 19 cents a share, on revenue of $510.3 million.

Looking ahead, Manitowoc sees 2006 earnings of $2.15 to $2.25 a share, before items. Analysts project earnings of $1.96 a share. Shares were trading up $4.75 to $54.07.

NYSE

volume leaders included

Lucent Technologies

( LU), down 1 cent to $2.92;

Ford

(F) - Get Report

, up 19 cents to $7.17;

Sprint Nextel

(S) - Get Report

, down 62 cents to $24.41;

Corning

(GLW) - Get Report

, up 99 cents to $28.59;

Nortel Networks

( NT), unchanged at $2.65; ; and

General Electric

(GE) - Get Report

, up 19 cents to $34.16.

Nasdaq volume leaders included

Sanmina-SCI

(SANM) - Get Report

, up 87 cents to $4.91;

Intel

(INTC) - Get Report

, up 15 cents to $19.30;

JDSU

(JDSU)

, up 4 cents to $3.61;

Sun Microsystems

(SUNW) - Get Report

, up 1 cent to $5;

Cisco

(CSCO) - Get Report

, up 38 cents to $20.85;

Oracle

(ORCL) - Get Report

, up 7 cents to $14.72; and

Microsoft

(MSFT) - Get Report

, up 3 cents to $27.14.