By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Facebook Inc. shares jumped Monday, helping to lead the tech sector higher while Microsoft shares gave back some earlier gains that had come with the news last week that CEO Steve Ballmer will retire.

Facebook (FB) climbed 2.2%, to reach $41.44 by early afternoon -- setting a new intraday high earlier in the session and on pace for its highest closing price since it controversial IPO last May.

The social network has surged more than 57% since it reported its most-recent quarterly results on July 24. Facebook went public last May at $38 per share.

Microsoft Corp. (MSFT) shares shed more than 2% earlier in the session -- though the stock was last down about 0.5% to $34.61. The stock had jumped on Friday after Chief Executive Steve Ballmer said he would retire within the next year.

On Monday, VMware Inc. (VMW) said it had hired Microsoft Chief Information Officer Tony Scott to be CIO and senior vice president at the cloud-infrastructure and virtualization technology company. Over the weekend, the AllThingsD technology blog reported that activist fund ValueAct might continue to press for more accommodations from the company, like an increased dividend or buyback.

The tech-heavy Nasdaq Composite Index (RIXF) rose 0.7% to 3,683, while the Philadelphia Semiconductor Index (SOX) rose 0.3% and the Morgan Stanley High Tech 35 Index (MSH) rose by 0.3%.

Other strong gainers included Apple Inc. (AAPL), Groupon Inc. (GRPN), and BlackBerry (RIMM) .

Shares of two 3D printing firms jumped as Citigroup kicked off coverage of the pair with buy ratings. In early trades, 3D Systems Corp. (DDD) was up 10% to $53.28, while Stratasys (SSYS) jumped nearly 6% to $112.

In a note to clients, analyst Kenneth Wong said he believes the 3D printing market "is on the cusp of seeing much broader adoption across more upstream production applications and the consumer end market," which could triple the size of the market within 5 years.

Altera Corp. (ALTR) shares rose nearly 1.9% after Citigroup upgraded the chipmaker to a buy rating. Software maker Adobe (ADBE) rose 1.7% after Pacific Crest upgraded the stock to outperform.

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