Shares of

Hittite Microwave

(HITT)

were among technology's winners Friday, jumping 13% after the company posted better-than-expected fourth-quarter results and offered an earnings guidance above Wall Street's forecast.

Hittite, a maker of chips used in radio-frequency devices, earned $12.1 million, or 39 cents a share, in the quarter. Analysts polled by Thomson First Call expected earnings of 34 cents a share. Revenue totaled $35.4 million, compared with Wall Street's estimate of $34.8 million. A year earlier, the company earned $7.1 million, or 23 cents a share, on revenue of $22.7 million.

For the first quarter, Hittite sees earnings of 36 cents to 38 cents a share, above analysts' projection of 33 cents. The company sees revenue of $35 million to $36 million, compared with Wall Street's forecast of $36.1 million. Shares were trading up $5.17 to $43.33.

Stamps.com

(STMP) - Get Stamps.com Inc. Report

vaulted 18% after the online seller of postage stamps reported earnings that topped expectations. The company earned $4.7 million, or 20 cents a share, in the fourth quarter. Excluding stock-based compensation costs, earnings were $5.1 million, or 22 cents a share, beating analysts' forecast by 2 cents. Revenue totaled $25 million, compared with Wall Street's target of $24 million. A year earlier, the company earned $4.1 million, or 17 cents a share, on revenue of $20.6 million.

Stamps.com's forecast adjusted earnings of 80 cents to 90 cents a share, with revenue of $90 million to $100 million. Analysts project earnings of 84 cents a share on revenue of $98.1 million. After the report, First Albany upgraded the stock to buy from neutral. Shares were trading up $2.56 to $16.86.

Shares of

Ditech Networks

( DITC) jumped 12% after the telecom-equipment company's third-quarter earnings beat forecasts. For the period ended Jan. 31, the company posted adjusted earnings of $3 million, or 9 cents a share, on revenue of $22.1 million. Analysts expected earnings of 7 cents a share and revenue of $22.1 million. In the year-earlier period, the company earned $238,000, or a penny a share, on revenue of $14 million.

Looking ahead, Ditech sees a fourth-quarter sequential revenue gain of 5%, which would imply revenue of $23.2 million. Analysts project revenue of $22.8 million. Shares were trading up 84 cents to $8.06.

Shares of

Captaris

(CAPA)

plunged 25% after the software company reported mixed fourth-quarter results and was downgraded by Needham. The company earned $2.2 million, or 8 cents a share, beating analysts' target of 6 cents. Revenue, however, was $25.2 million and missed analysts' forecast of $26 million. During the year-earlier period, the company earned $44,000, or less than a penny a share, on revenue of $24.7 million.

Needham downgraded the stock to hold from buy, saying the shares are fully valued. The stock recently was down $2.21 to $6.67.

Sonic Solutions

( SNIC) tumbled 13% after the software company posted disappointing revenue numbers and said it will need to restate past results. For the third quarter ended Dec. 31, the company reported revenue of $39.1 million. Analysts, on average, expected revenue of $40.9 million. Sonic sees fourth-quarter revenue of $37 million to $41 million, compared with Wall Street's forecast of $48.3 million.

Sonic also said that, based on a review of its historical stock option practices, it would need to record charges for stock options expense and restate previous financial statements. The charges, the company said, will be "material." Shares were trading down $1.96 to $14.07.

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Sun Microsystems

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Sirius Satellite Radio

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, down 1 cent to $3.59;

Intel

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, unchanged at $21.31;

Cisco Systems

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, down 16 cents to $27.40; and

Oracle

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, up 5 cents to $16.96.