By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Facebook Inc. shares jumped Monday morning, helping to lead the tech sector higher as the social-media giant's shares hit a new 52-week high, while Microsoft shares gave back some earlier gains that had come with the news that CEO Steve Ballmer would retire.

Facebook (FB) climbed 2.7%, to reach $41.62, adding to gains that have lifted the company's stock by 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 2% to slip to $34.05. 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 0.4% to 3,673, while the Philadelphia Semiconductor Index (SOX) and the Morgan Stanley High Tech 35 Index (MSH) rose by a fraction.

Early gains also came from Apple Inc. (AAPL), Groupon Inc. (GRPN), Hewlett-Packard Co. (HPQ) and Oracle Corp. (ORCL). Small losses also came from Seagate Technology (STX), Netflix Inc. (NFLX), Amazon.com Inc. (AMZN) and Yelp Inc. (YELP).

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 7.6% to $52.10, while Stratasys (SSYS) jumped 6% to $112.23.

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 2% after Citigroup upgraded the chipmaker to a buy rating. Software maker Adobe (ADBE) rose 1.5% after Pacific Crest upgraded the stock to outperform.

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

HP (NYSE:HPQ)
Historical Stock Chart
Von Jun 2024 bis Jul 2024 Click Here for more HP Charts.
HP (NYSE:HPQ)
Historical Stock Chart
Von Jul 2023 bis Jul 2024 Click Here for more HP Charts.