By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- On a day in which losses weighed on the tech sector in late trading, it was a gain from Facebook Inc. that stood out Monday, as the social-networker's stock posted its highest closing price since going public a year ago.

Facebook (FB) continued its recent muscle-flexing, as the company's shares rose almost 2%, to close at $41.34, topping Friday's previous record close for the stock. The social network's shares have climbed 56% 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 almost 2% to close at $34.15. The stock had jumped on Friday after Chief Executive Steve Ballmer said he would retire within the next year.

With Ballmer planning to step aside, focus began to shift toward what, if anything, Microsoft has planned to appease shareholders that have stuck with a stock that has remained relatively stagnant for more than a decade.

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 fromMicrosoft, like an increased dividend or buyback.

The tech-heavy Nasdaq Composite Index (RIXF) ended the day down by less than 1 point, at 3,657, while the Philadelphia Semiconductor Index (SOX) rose and the Morgan Stanley High Tech 35 Index (MSH) also closed with small losses.

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. 3D Systems Corp. (DDD) rose 7% to $51.90, while Stratasys (SSYS) closed with a gain of 4% at $110.04 a share.

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 1.4% after Citigroup upgraded the chipmaker to a buy rating. Software maker Adobe (ADBE) rose 0.6% after Pacific Crest upgraded the stock to outperform.

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