By Rex Crum

SAN FRANCISCO (MarketWatch) -- Tech stocks finished slightly higher Thursday, but several decliners made their presence felt on the sector by the time the market closed.

Motorola Inc. (MOT) shares exemplified the day's action. The company's shares climbed as much as 6%, but gave back nearly all of that to close with a gain of 4 cents to $8.13. The company reported an increase in its third-quarter earnings, led by smart-phone sales running on Google Inc.'s (GOOG) Android operating system. Motorola said its mobile-phone business turned a profit for the first time in three years.

Akamai Technologies Inc. (AKAM) rose 72 cents a share to $51.11 after the provider of Web traffic-management technology reported a third-quarter profit of $39.7 million, or 21 cents a share, up from $32.7 million, or 18 cents a share, in the year-ago quarter. Revenue rose to $253.6 million from $206.5 million. The company also forecast fourth-quarter sales in a range of $272 million to $285 million.

Security-software maker Symantec Corp. (SYMC) ended the day up 65 cents a share, or more than 4%, at $16.45. On Wednesday, Symantec reported second-quarter results that beat Wall Street forecasts and gave a better-than-expected outlook for its third quarter.

Semiconductor company LSI Corp. (LSI) managed to maintain its edge, rising 35 cents a share, or 7.4%, to close at $5.09 following a mixed third-quarter report. LSI said its fourth-quarter sales should rise from the year-ago period and it could extend its stock buy-back program.

Microsoft Corp. (MSFT) rose 23 cents a share to close at $26.28 ahead of the No. 1 software company's earnings report, due after the market close.

Led by those gains, the Nasdaq Composite Index (RIXF) managed to eke out a rise of 4 points to close at 2,507. The Philadelphia Semiconductor Index (SOX) closed with a slight loss.

Some of the biggest declines came from the optical-networking sector after Oclaro Inc. (OCLRD) gave a disappointing first-quarter report and outlook.

Before the market opened Thursday, Oclaro said it earned a penny a share on $121.3 million in sales. Excluding one-time items, Oclaro would have earned 6 cents a share, while analysts had forecast Oclaro to earn 22 cents a share on $123.3 million in sales. The company also said that for its second quarter it expects to post sales of $116 million to $124 million, which is below analysts' estimates of $128.5 million.

That sent Oclaro's stock down by $5.08 a share, or more than 37%, to close at $8.60. Other optical networkers joined in the retreat, withe JDS Uniphase Inc. (JDSUD) down 11.4% and Finisar Corp. (FNSR) shares falling more than 6%.

 
 
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