Spartan Motors

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surged more than 30% after the maker of custom motor vehicle chassis and bodies more than tripled its earnings year over year to $3.3 million, or 16 cents a share, on revenue of $123.6 million in the fourth quarter. These numbers include a noncash goodwill charge of a dime a share. Analysts were looking for earnings of 17 cents a share on $102.3 million revenue. The Michigan-based company was rising $5.31 to $22.20.

Salary-management Web site

Salary.com

( SLRY) jumped 20% after the launch of its initial public offering, which priced 5.7 million shares at $10.50 apiece. The offering, for which Thomas Weisel Partners is the sole book runner, includes an underwriter's option for another 855,000 shares to cover overallotments. The IPO should close Feb. 21. Shares of the Waltham, Mass., company were up $2.10 to $12.60.

OpNext

( OPXT) also debuted with a bang today, with an IPO of roughly 16.9 million shares priced at $15 apiece, 10 million of them sold by the Eatontown, N.J., company, itself. The underwriters, led by Goldman Sachs, can purchase roughly another 2.5 million shares. The company, which makes optical components for high-speed telecommunications equipment, was climbing $2.49, or 16.6%, to $17.49.

Stratasys

(SSYS) - Get Stratasys Ltd. Report

surged on impressive fourth-quarter results. The Eden Prairie Minn.-based maker of printing systems said income (sans stock option expenses) totaled $3.9 million, or 38 cents a share, on $29.7 million revenue that was 26% higher than last year. Year-ago profits came to $3.1 million, or 30 cents a share. Analysts sought 36 cents a share on $27.6 million in sales. Shares were gaining $5.30, or 16.3%, to $37.81.

Network-equipment maker

Avici Systems

( AVCI) swung to a profit of $4 million, or 28 cents a share, excluding items, on sales of $15.9 million. Last year the North Billerica, Mass.-based company had a loss of $8.1 million, or 63 cents a share, on revenue of $5.6 million. Two analysts had the company earning a nickel a share; three projected $13.1 million in sales. Shares were adding $1.18, or 15.7%, to $8.72.

Shares of

TheStreet Recommends

Ryerson

(RYI) - Get Ryerson Holding Corporation Report

were riding high after main shareholder Harbinger Capital Partners, which owns a 9.7% stake in the metals processor, said it will attempt to revamp most of the current board of directors in light of Ryerson's most recent financials. Harbinger first announced this reshuffling intention in a regulatory filing last month. Shares of the Chicago-based company were trading up $4.18, or 13.5%, to $35.19.

New York-based

TheStreet.com

( TSCM), which operates this Web site, doubled its fourth-quarter income to $4 million, or 14 cents a share, from last year, topping estimates by a penny. Revenue was up 44% year over year to $14.4 million, also above the $14 million mean target. Shares were gaining 79 cents, or 7.6%, to $11.19.

TRX

( TRXI) was plummeting after the business-software company predicted 2007 losses between 10 cents a share and break-even, excluding stock-option costs. Sales, excluding client reimbursements, should be between $85 million and $90 million. Wall Street is looking for gains of 46 cents a share on total sales of $104.4 million. The Atlanta-based company also issued fourth-quarter results that topped expectations, with income of $1.3 million, or 7 cents a share, on revenue of $27.4 million. Still, shares were losing $2.26, or 34.6%, to $4.28.

Cyanotech

(CYAN) - Get Cyanotech Corporation Report

was falling after the Hawaii-based maker of dietary supplements said that restatements for fiscal 2004, 2005 and 2006 would result in an overall drop in the combined bottom line for those years, and that the $199,000 profits previously reported for the fiscal fourth quarter of 2006 will reverse to a $43,000 loss. The company also expects to widen its losses for the quarter ended Dec. 31 to between $1 million and $1.2 million, in large part due to restatement costs, and announced it won't file those financials on time. Shares were down 34 cents, or 16%, to $1.76.

Auxilum Pharma

(AUXL)

was sliding after the Malvern, Pa.-based company posted a fourth-quarter loss of $12.8 million, or 36 cents a share. This narrowed from losses of $11 million, or 38 cents a share, last year, and the Street was looking for a wider per-share loss of 43 cents. The company also guided to the high end of the 2007 revenue consensus, projecting a range between $88 million and $92 million. Still, shares were off $1.68, or 11.1%, to $13.49.

Lufkin Industries

( LUFK) was lower on soft guidance, despite impressive fourth-quarter results, as the Texas-based maker of oil-drilling equipment said it will probably earn between 95 cents and $1.15 a share in the first quarter. Two analysts are looking for $1.21 a share. Full-year 2007 earnings are pegged at $4.40 to $5.30 a share, just barely meeting one analyst's $5.30-a-share projection. Fourth-quarter income came to $23 million, or $1.52 a share, up sharply from last year's $15.4 million, or $1.03 a share, a year ago; the company also upped its dividend by 16.7% to 21 cents a share. But Lufkin stock was sinking $6.74, or 11.1%, to $54.18.