Friday's Tech Winners & Losers

Updated from 11:59 a.m. EDT

Tech stocks were flat Friday, weighed by sinking Marvell Technology Group(MRVL Quote).

The chipmaker lost 11.8%, after reporting it had swung to second-quarter loss Thursday, after the bell. Marvell lost $56.5 million, or 10 cents a share, compared with income of $44.9 million, or 7 cents a share, in the year-ago period. Excluding stock option compensation expenses, the company earned 6 cents a share, meeting Wall Street's expectations. Shares dipped $2.10 to close at $15.75.

Marvell's fall weighed on the Nasdaq 100 but was offset by Apple's(AAPL Quote) 3.2% rise to $135.30. The index was up 29.5 points to about 1961.

Mentor Graphics(MENT Quote) jumped 17.9%, after swinging to a second-quarter profit and beating Wall Street's estimates. Reporting after the bell Thursday, the software developer said it earned $2.4 million, or 3 cents a share, vs. a loss of $448,000 in the same period last year. Excluding items, the company earned 15 cents a share, beating the 9 cents a share forecast by analysts polled by Thomson Financial. Shares gained $2.24 to close at $14.73.

MetroPCS Communications(PCS Quote) jumped $2.82, or 11.1%, to close at $28.35, and Leap Wireless(LEAP Quote) closed up $2.97, or 4.7%, to $66.39 after the wireless telecommunications carriers enjoyed a second day of run-ups in the sector. On Thursday, a Credit Suisse report suggested a merger between the two companies "makes a lot of sense," according to MarketWatch. The two companies compete for younger and lower-income customers, offering prepaid plans.

Shares of Sonic Solutions(SNIC Quote) plummeted 25%, after Soleil downgraded the digital media software company to hold, from buy. The stock closed down $2.60 to $7.80.

China Sunergy(CSUN Quote), a Chinese company that makes solar cells from silicon wafers, sank 20.7% after swinging to a second-quarter loss. The company lost $3.8 million, or 14 cents per diluted share, vs. a profit of $1.6 million, or 9 cents a diluted share in the year-ago period. Analysts polled by Thomson Financial expected a profit of 2 cents a share. The company also announced that CFO Zhu Zhiping was resigning for personal reasons. Shares fell $1.54 to $5.91.