Thursday's Late Winners & Losers

Dell (DELL) plunged some 7% in extended trading Thursday after the computer maker found "a number of accounting errors, evidence of misconduct and deficiencies in the financial control environment" in an ongoing internal investigation of its bookkeeping. The Round Rock, Texas, company won't file its year-end financials on time as a result. Shares were sliding 54 cents, or 2.3%, to $22.85 in recent after-hours trading.

Electronics-products maker Spectrum Control (SPEC) jumped nearly 11% after its fiscal first-quarter per-share profit climbed eightfold from last year to 16 cents, or $2.1 million, on sales that surged 28.7% to $32.9 million. Shares of the Fairview, Pa., small-cap were gaining $1.18, to $12.08.

PMC-Sierra (PMCS) gained after the Santa Clara, Calif., chipmaker announced it will close two of its R&D centers, letting go of some 175 employees in the process -- about 15% of its total headcount -- in order to cut annual costs by roughly $20 million to $24 million. The restructuring costs should total between $12 million and $14 million. Shares were up 25 cents, or 4%, to $6.55. ...