Shares of

Heelys

( HLYS) and

Allegiant Travel

(ALGT) - Get Report

were among the

Nasdaq's

biggest winners Friday, as both stocks soared on their first day of trading.

Heelys, a Dallas-based maker of wheeled footwear, priced its 6.4 million-share offering at $21 a share, well above the projected $16 to $18 range. The stock recently was trading at $34.28, up 63%.

Allegiant Travel priced a 5 million-share offering at $18 a share, above the target range of $15 to $17. The Las Vegas-based company operates a low-cost passenger airline marketed toward leisure travelers in small cities. Shares recently were up 39% to $25.05.

Another initial public offering with a strong showing was

Aegean Marine Petroleum Network

(ANW)

, a fuel shipper and supplier. Aegean's stock rose 14% on its first day after it priced its IPO of 12.5 million shares at $14 each.

The stock reached an intraday high of $16.50 before easing back to close at $16.02.

Elsewhere, shares of

Harsco

(HSC) - Get Report

rose 2% after the industrial products company backed its 2006 guidance and gave a 2007 forecast in line with Wall Street's expectation. For this year, the company still expects earnings from continuing operations of $4.49 to $4.51 a share, with revenue exceeding $3.3 billion. Analysts polled by Thomson First Call expect earnings of $4.51 a share and revenue of $3.34 billion.

The company, which gave its guidance in advance of an analyst conference Friday, said its initial forecast for 2007 calls for earnings from continuing operations of $5.05 to $5.15 a share. Analysts, on average, see earnings of $5.06 a share for the year. Harsco shares were adding $1.34 to $79.81.

Another industrial outfit,

Ingersoll-Rand

(IR) - Get Report

, climbed on news that it's launching a $2 billion share buyback. "We believe that repurchasing our shares represents a good investment to enhance shareholder value," said Herbert L. Henkel, chairman, president and chief executive officer. "The board's action reflects our company's solid fundamentals and sound balance sheet." Shares of Ingersoll-Rand were up $1.10, or 2.8%, to $40.60.

Smith & Wesson

(SWHC)

shares sank 12% after the firearm maker's fiscal second-quarter earnings fell short of forecasts. For the quarter ended Oct. 31, the company's earnings rose to $2.9 million, or 7 cents a share, from $692,000, or 2 cents a share, a year earlier. Analysts expected a profit of 9 cents a share for the latest period. Smith & Wesson's sales rose to $50.8 million from $35.5 million last year.

For the full year, Smith & Wesson backed its forecast for earnings of 36 cents a share and sales of roughly $200 million. Analysts, on average, predict earnings of 37 cents a share and revenue of $201 million. Looking ahead to fiscal 2008, the company forecast earnings of 52 cents a share, with sales of $250 million. Wall Street anticipates fiscal 2008 earnings of 49 cents a share and sales of $232 million. The company's shares recently were trading at $12.11, down $1.66.

Shares of

Central Garden & Pet

(CENT) - Get Report

shed 11% after the pet and garden supply company posted in-line fourth-quarter earnings but offered a weaker-than-expected profit forecast for fiscal 2007. For the fiscal fourth quarter ended Sept. 30, the company reported net income of $6 million, or 25 cents a share, down from $6.7 million, or 31 cents a share, a year earlier. Excluding certain items, earnings were 49 cents a share, matching analysts' mean estimate. Sales rose to $421 million from $323 million.

Central Garden and Pet warned that fiscal 2007 results may be hurt by "skyrocketing" grain costs. The company forecast full-year earnings of $3 to $3.10 a share, below Wall Street's forecast of $3.38. The company sees total sales of $1.76 billion to $1.78 billion. Analysts target a top line of $1.75 billion. Shares of Central Garden & Pet were losing $5.70 to $47.19.

The

NYSE's

biggest volume movers Friday were

Ford

(F) - Get Report

, down 6 cents to $7.10;

Citigroup

(C) - Get Report

, up $1.61 to $52.32;

Pfizer

(PFE) - Get Report

, up 25 cents to $25.111;

Chesapeake Energy

(CHK) - Get Report

, down $1.28 to $32.32;

Bank of America

(BAC) - Get Report

, down 94 cents to $51.55;

Motorola

( MOT), down 13 cents to $21.31;

LSI Logic

(LSI) - Get Report

, up 12 cents to $9.29;

Advanced Micro Devices

(AMD) - Get Report

, down 4 cents to $21.01; and

Time Warner

(TWX)

, up 34 cents to $20.90.

Nasdaq's heaviest traded stocks included

Microsoft

(MSFT) - Get Report

, up 7 cents to $28.92;

Sun Microsystems

(SUNW) - Get Report

, up 4 cents to $5.72;

Intel

(INTC) - Get Report

, up 9 cents to $20.74;

Apple

(AAPL) - Get Report

, up $1.79 to $88.83;

Oracle

(ORCL) - Get Report

, up 32 cents to $17.82;

Sirius Satellite Radio

(SIRI) - Get Report

, down 7 cents to $3.81;

Cisco

(CSCO) - Get Report

, up 21 cents to $27.09;

Level 3

(LVLT)

, up 8 cents to $5.82; and

Xilinx

(XLNX) - Get Report

, down $1.47 to $24.97.