Staffing-services firm General Employment Enterprises ( JOB) tumbled 23.1% to $2.10 in heavier-than-usual trading after fiscal second-quarter income, at 2 cents a share, was a penny lower than last year; health-care staffer AMN Healthcare Services ( AHS) lost 8.7% at $22.23 on second-quarter income guidance of 23 cents to 25 cents a share, which leans below the Street's consensus. And Bruker BioSciences ( BRKR), which makes X-ray systems and other analytical devices, plummeted 21% to $9.09 despite meeting first-quarter targets.

Elsewhere, refined-sugar purveyor Imperial Sugar ( IPSU) was down 7.3% to $27.60 after predicting that declining refined-sugar prices will continue falling for the rest of the fiscal year. Mortgage-investment firm HomeBanc ( HMB) sliced its first-quarter outlook by a dime a share, now expecting a loss of 30 cents to 34 cents a share. Shares gave up 11.1% to $2.49.

Recently, the Russell 2000 Index was adding 1.43 points, or 0.2%, to 816. The S&P SmallCap 600 was up 0.5% at 422.76.

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