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) - Get Report

, up 35 cents to $30.80;

Cisco Systems

(CSCO) - Get Report

, up 22 cents to $26.44;

Conexant Systems

(CNXT) - Get Report

, down 20 cents to $1.81;

Intel

(INTC) - Get Report

, up 23 cents to $20.83;

Sun Microsystems

(SUNW) - Get Report

, down 1 cent to $6.33;

Apple

(AAPL) - Get Report

, down 54 cents to $85.71;

Level 3 Communications

(LVLT)

, down 9 cents to $6.08; and

Sirius Satellite Radio

(SIRI) - Get Report

, up 3 cents to $3.76.