By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Yelp Inc. added to its gains in afternoon trading Thursday, highlighting activity that helped the tech sector start off August with a broad slate of advancers.

Yelp's (YELP) shares rose more than 25% to $52.36 after three Wall Street analysts raised their ratings on the company following its second-quarter report late Wednesday. Yelp said it lost $878,000, or a penny a share, on revenue of $55 million for the quarter ended June 30. During the same period a year ago, Yelp lost $2 million, or 3 cents a share, on $32.7 million in sales.

The company's results topped the estimates of analysts surveyed by FactSet, who had forecast Yelp to lose 4 cents a share on sales of $53.3 million. Yelp attributed its business performance to gains in usage and advertising from mobile devices.

J.P. Morgan analyst Kaizad Gotla said Yelp's results showed "there's still significant room for strong revenue growth and margin expansion. We think the pace of innovation in new advertising products is accelerating."

Gotla raised his rating on Yelp to overweight from neutral. Additionally, Wunderlich Securities analyst Blake Harper lifted his rating on Yelp to buy from hold, and Darren Afthai, of Northland Capital Markets, raised his take on Yelp to outperform from market perform.

With Yelp in the lead, the Nasdaq Composite Index (RIXF) rose 38 points to 3,664. The Philadelphia Semiconductor Index (SOX) and the Morgan Stanley High Tech 35 Index (MSH) were both up more than 1%.

Other notable gainers included Trulia Inc. (TRLA), which rose almost 26%, to $46.89 a share after the online real-estate information site posted upbeat quarterly results late Wednesday.

Teradyne Corp. (TDC) shares rose almost 6%, to $62.46, after the chip-equipment company reported better-than-expected quarterly results following Wednesday's market close.

Apple Inc. (AAPL) shares rose $2.34 to $454.81. Jefferies & Co. analyst Peter Misek raised his price target on Apple's stock to $450 a share from $405, adding that he sees a "floor" coming regarding iPhone shipments. Apple reclaimed the title of the world's most valuable company by stock-market value.

Dell Inc. (DELL) rose 1.7%, to $12.88 a share, a day ahead of a special stockholder meeting on Chief Executive Michael Dell's proposal to take the PC company private in a deal valued at more than $24 billion.

Netflix Inc. (NFLX) shares were up by 1.4%, at $247.78. On Thursday, the company began rolling out a new feature that lets its subscribers create separate viewing profiles for different household members.

LinkedIn Corp. (LNKD) shares rose more than 3% to $210.32 ahead of the online professional-networking company's quarterly results, due after the market close.

Pandora Media Inc. (P) shares climbed more than 3% to $18.96. Earlier Thursday, the holding company that runs Pandora rival Spotify said its revenue more than doubled in 2012, but its loss expanded to the equivalent of $77.7 million, from $60 million in 2011.

Amazon.com Inc. (AMZN) rose $1 a share to $302.26. Bernstein Research analyst Carlos Kirjner raised his price target on Amazon's stock to $375 a share from $350, after estimating the company has 25 million Amazon Prime members. Amazon has never disclosed the number of its Prime membership customers.

Other gains came from Hewlett-Packard Co. (HPQ), IBM Corp. (IBM) and Google Inc. (GOOG).

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