By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Big drops on shares of Apple Inc. and Facebook Inc. weighed down the rest of the tech sector late Tuesday afternoon, though Dell Inc. managed to gain more ground on deal speculation.

The Nasdaq Composite Index (RIXF) slipped by 0.3% to 3,110. The Philadelphia Semiconductor Index (SOX) fell by 0.5% and the Morgan Stanley High Tech 35 Index (MSH) fell 0.3%. The Dow and S&P 500 were both positive in the last hour of trading.

Facebook (FB) fell 2.7% to $30.11 after the social network unveiled the "graph search" function at an event at its Silicon Valley headquarters.

Search engine giant Google (GOOG) was up fractionally, but online-review and recommendation company Yelp Inc. (YELP) was seen as suffering at the hands of Facebook's new initiative, as its shares fell more than 7% to $20.27.

Apple (AAPL) was last down 3%, to $487 a share. Nomura Equity Research analyst Stuart Jeffrey cut his December quarter iPhone sales estimates to 48 million from 50 million, and lowered his revenue forecast for Apple to $53 million from $54.2 million, saying that he still believes margins on the iPhone "are unsustainably high and will fall."

Dell Inc. (DELL) continued to flex its muscles, rising more than 6% to $13.05 a share on top of Monday's 13% gain. The advances came about after reports said the PC giant is in talks with two private-equity firms about going private. The Wall Street Journal reported that the companies in the discussions were TPG and Silverlake Partners.

Analysts that follow Dell said a buyout of the company is possible, but there are many hurdles to overcome if the world's third-largest PC company goes private.

"The likelihood is low, as it would take sizable financing for a company of Dell's size, with its $21 billion market cap," said Shaw Wu of Sterne Agee. "A deal of this size would likely involve multiple private-equity firms, and we estimate that the majority of [Dell's] businesses remain under structural and secular pressure."

Research In Motion Ltd. (RIMM) was upgraded to a buy rating from underperform by Charter Equity on Tuesday. But shares of the BlackBerry maker were down 2.9% after jumping more than 10% in the previous session.

In a note to clients, analyst Ed Snyder wrote that the "curb appeal" of the new BlackBerry 10 operating system expected to launch in the coming weeks "could help investors look past network-pricing issues." He cited his "preliminary review" of the new operating system, adding that with "a compelling user interface, 70K applications and RIM's hallmark QWERTY keyboard included in the SKU lineup, we believe the BB10 platform will appeal to a healthy percentage of the company's 80K subscribers, driving an upgrade cycle."

Other declines included Hewlett-Packard Co. (HPQ), Nvidia Corp. (NVDA) and software giant SAP (SAP) .

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