Tuesday's Small-Cap Winners & Losers

Robbins & Myers(RBN Quote) was one of Tuesday's small-cap winners as the Dayton, Ohio-based diversified machinery company reported a rise in fourth-quarter earnings. Looking ahead, the company said it expects 2007 earnings to range from $1.70 to $1.90 a share. For the first quarter, the company is looking for earnings of 40 cents to 50 cents a share. Shares were trading up $4.25, or 13.4%, to $35.99.

Pemstar(PMTR Quote) surged on news that the Rochester, Minn.-based company agreed to be acquired by Benchmark Electronics(BHE Quote) for $211 million in stock. Shares of Pemstar were climbing 68 cents, or 18.6%, to $4.33. Benchmark was slipping 96 cents, or 3.3%, to $27.97.

Rita Medical Systems(RITA Quote) gained after the Fremont, Calif., company said its Habib 4X Laparoscopic resection device received marketing clearance from the Food and Drug Administration. Shares were trading up 15 cents, or 4.4%, to $3.60.

Neurochem(NRMX Quote) slumped after the Canadian biopharmaceutical company was downgraded by Piper Jaffrey to underperform from market-perform. Shares were down $2.11, or 11.6%, to $16.02.

SunOpta(STKL Quote) stumbled after the Canadian natural and organic food company said it's taking a third-quarter charge of $2.1 million for a number of items, including the write-down of inventory from the 2005 crop to its net realizable value. Shares were falling 85 cents, or 7.5%, to $10.51.