Monday's Winners & Losers: Sallie Mae

Shares of Powell Industries(POWL Quote) slumped 13.1% after the company said that it found accounting errors at one of its divisions. The errors were discovered in the course of a financial review conducted by the division's new controller shortly after joining the company. The errors relate to inventories, accounts payable and work-in-process items. The company said the errors would reduce earnings by about $2.5 million, or 22 cents a share. "While we believe these errors were the result of mistakes, all appropriate measures and reviews are being taken to correct this situation," the company said. Shares were down $4.83 to $32.16.

NYSE volume leaders included Citigroup(C Quote), up $1.33 to $52.93; Ford(F Quote), up 1 cent at $8.03; First Marblehead(FMD Quote), down $9.83 to $34.60; Washington Mutual(WM Quote), up $1.31 to $40.73; General Electric(GE Quote), down 2 cents to $35.36; and Boston Scientific(BSX Quote), up 99 cents to $16.

Nasdaq volume leaders included Sun Microsystems(SUNW Quote), up 6 cents to $5.86; Cisco Systems(CSCO Quote), down 6 cents to $26.62; Intel(INTC Quote), up 23 cents to $20.69; Amgen(AMGN Quote), up 62 cents to $59.65; Oracle(ORCL Quote), up 27 cents to $18.90; Sirius Satellite Radio(SIRI Quote), down 4 cents at $3.04; Apple(AAPL Quote), up $1.19 to $91.43; and Microsoft(MSFT Quote), up 12 cents to $28.73.