Shares of MEMC Electronics Materials ( WFR) were among technology's winners Friday, jumping 16.5% after the maker of silicon wafers posted better-than-expected fourth-quarter results and issued a bullish outlook for its first quarter and full year.

The company earned $129 million, or 56 cents a share, on revenue of $420.5 million. Adjusted earnings came in at $157.8 million, or 68 cents a share. Analysts polled by Thomson First Call expected earnings of 59 cents a share on revenue of $416.1 million. During the year-earlier period, the company earned $50.2 million, or 22 cents a share, on revenue of $303.4 million.

Looking ahead, MEMC sees first-quarter revenue of roughly $440 million. It sees full-year adjusted earnings topping $3 a share on revenue of more than $1.9 billion. Analysts project first-quarter revenue of $424.7 million and full-year earnings of $2.55 a share on revenue of $1.84 billion. Shares were trading up $7.18 to $50.80.

International Rectifier ( IRF) climbed 13% after the chipmaker posted second-quarter results that beat expectations and issued better-than-expected third-quarter revenue guidance. The company posted adjusted earnings of $42.5 million, or 58 cents a share, on revenue of $354.7 million. Analysts expected earnings of 54 cents a share on revenue of $350.8 million. During the year-earlier quarter, the company posted adjusted earnings of $26.5 million, or 37 cents a share, on revenue of $278.8 million.

Looking ahead, International Rectifier sees flat sequential third-quarter revenue, plus or minus 2%. Analysts project revenue of $341.7 million. Shares were trading up $4.92 to $42.55.

Shares of Technitrol ( TNL) slumped 14% after the producer of electronic components posted disappointing fourth-quarter results and warned that first-quarter revenue would be below forecasts. The company posted earnings of $14.4 million, or 35 cents a share, on revenue of $236.1 million. Excluding items, the company earned 40 cents a share. Analysts expected earnings of 45 cents a share on revenue of $245.8 million. During the year-earlier period, the company earned $7.8 million, or 19 cents a share, on revenue of $184.5 million. Excluding items, the company earned 29 cents a share during the year-earlier period.

Looking ahead, Technitrol sees first-quarter revenue of $233 million to $236 million. Analysts project revenue of $242.5 million. Shares were trading down $3.51 to $22.40.

PLX Technology ( PLXT) tumbled 12% after the chipmaker posted disappointing fourth-quarter earnings and warned that first-quarter revenue would be below expectations. The company earned $162,000, or a penny a share, on revenue of $21 million. Analysts expected earnings of 9 cents a share on revenue of $21 million. During the year-earlier quarter, the company earned $35,000, or less than a penny a share, on revenue of $15.3 million.

Looking ahead, PLX Technology sees first-quarter revenue of $18 million to $19 million. Analysts project revenue of $21.4 million. Shares were trading down $1.43 to $10.20.

Shares of CDW ( CDWC) fell 8% after the seller of computer products posted fourth-quarter earnings that fell below expectations. The company reported earnings of $53.6 million, or 67 cents a share, on revenue of $1.82 billion. Excluding items, the company earned $69 million, or 86 cents a share. Analysts expected earnings of 91 cents a share on revenue of $1.81 billion. During the year-earlier period, the company earned $70.5 million, or 86 cents a share, on revenue of $1.61 billion. Shares were trading down $5.74 to $65.01.

Other technology movers included Microsoft ( MSFT), up 35 cents to $30.80; Cisco Systems ( CSCO), up 22 cents to $26.44; Conexant Systems ( CNXT), down 20 cents to $1.81; Intel ( INTC), up 23 cents to $20.83; Sun Microsystems ( SUNW), down 1 cent to $6.33; Apple ( AAPL), down 54 cents to $85.71; Level 3 Communications ( LVLT), down 9 cents to $6.08; and Sirius Satellite Radio ( SIRI), up 3 cents to $3.76.