Today's Tech Winners and Losers

Silicon Labs surges after its earnings top estimates.
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Shares of

Silicon Labs

(SLAB) - Get Report

were among the winners of technology stocks Wednesday, rising 18% after the maker of mixed-signal integrated circuits reported fourth-quarter results that topped Wall Street forecasts.

Silicon Labs posted net earnings of $15.3 million, or 27 cents a share, up from $12.9 million, or 24 cents a share, a year earlier. Excluding certain items, the company reported adjusted earnings of $20.2 million, or 31 cents a share, beating Thomson First Call's mean analyst estimate of 26 cents a share. Revenue rose 15% to $109.9 million, exceeding Wall Street's target of $106.4 million and the company's own guidance of $104 million to $108 million.For the first quarter, Silicon Labs sees revenue of $110 million to $114 million, above analysts' projection of $102.8 million. Shares recently were up $7.42 to $48.96.

Shares of

Plantronics

(PLT) - Get Report

gained 16% after the maker of portable headsets posted fiscal third-quarter earnings that easily beat both its own and Wall Street's forecasts. For the quarter ended Dec. 31, the company recorded earnings of $22 million, or 46 cents a share, down from $24 million, or 48 cents a share. Sales rose 48% to $222.4 million. In November, Plantronics projected earnings of 29 cents to 34 cents a share and revenue of $195 million to $205 million. Analysts expected the company to post earnings of 39 cents a share and revenue of $202 million.

For its fiscal fourth quarter, Plantronics expects earnings of 39 cents to 44 cents a share, in line with analysts' projection of 41 cents. The company sees revenue of $200 million to $210 million, above Wall Street's target of $194 million. Shares were higher by $4.77 to $34.88.

Entrust

(ENTU)

shares slumped 17% after the maker of digital security products posted a revenue shortfall. Fourth-quarter earnings were $3.4 million, or 5 cents a share, on revenue of $24.8 million. Excluding items, the company earned 6 cents a share. Analysts predicted earnings of 4 cents a share and revenue of $28.2 million. A year earlier, Entrust recorded a profit of $2.6 million, or 4 cents a share, on revenue of $27.1 million. Shares fell 86 cents to $4.06.

Shares of

Trimble Navigation

(TRMB) - Get Report

surged 17% after the GPS technology company posted fourth-quarter results and a 2006 guidance that exceeded expectations. The company posted a profit of $23.4 million, or 41 cents a share, up from $16.4 million, or 29 cents a share, a year earlier. The results included a gain related to a joint venture with

Caterpillar

(CAT) - Get Report

. Excluding the gain, Trimble's earnings of 29 cents a share beat analysts' mean estimate by 4 cents. Revenue, meanwhile, shot up to $31.7 million from $13.1 million a year earlier.

For the first quarter, Trimble expects earnings, before items, of 38 cents to 41 cents a share. The company sees sales of $215 million to $221 million, representing 10% to 13% growth. Analysts had forecast earnings of 35 cents a share and a top line of $207.1 million. Trimble shares were up $6.03 to $41.05.

M-Systems

(FLSH)

shares tumbled 10% despite solid fourth-quarter results. The flash memory company posted fourth-quarter net income of $25 million, or 59 cents a share, including a net gain of 9 cents a share from one-time items. Revenue jumped to $205.7 million from $114.1 million a year earlier. The results beat analysts' expectations for earnings, before items, of 43 cents a share and revenue of $160.3 million.

Still, investors sent shares down after the company's conference call, in which M-Systems made cautious statements about its gross margin forecasts. The company said it can guarantee it will finish 2006 with higher gross margins than 2005. M-Systems shares recently were down $3.61 to $30.25.