By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks mostly rose Thursday morning, led by sharp gains from Pandora Media Inc., while Netflix Inc. slid following a pair of broker downgrades.

Pandora (P) rose as much as 10%, to a 52-week-high of $23.75 a share, after the Internet radio company on Wednesday named Brian McAndrews as its new chief executive. McAndrews replaces long-time CEO Joe Kennedy, who said in March that he would retire.

McAndrews' had previously headed up digital advertising company aQuantive, before Microsoft Corp. (MSFT) purchased the firm for $6.2 billion in 2007. Mark Mahaney, an analyst with RBC Captial Markets, said McAndrews appointment is "a positive for Pandora," as the company works to expand its advertising efforts, especially in the mobile-device market.

Netflix Inc. (NFLX) slid more than 2% in early trades, though was last down about 1.6%, to $303.20. Morgan Stanley analyst Scott Devitt lowered his rating on Netflix to equal weight from overweight, and Richard Greenfield, of BTIG, cut his rating on the stock to neutral from buy.

Both analysts said the main reason for their actions was the valuation of Netflix's stock, which has more than tripled in price this year. The moves also come after Netflix premiered its latest original series, "Derek", which stars, and was created by Ricky Gervais.

Dell Inc. (DELL) edged up by a penny a share to $13.86 after the computer giant's shareholders approved a plan by CEO Michael Dell to take Dell private at $13.88 a share.

Yahoo Inc. (YHOO) shares rose 2.5%, to $29.91. On Wednesday, Yahoo CEO Marissa Mayer told the TechCrunch Disrupt SF Conference that Yahoo has topped 800 million active monthly users.

Other gains came from Groupon Inc. (GRPN), which rose 5%, to $12.11, Apple Inc. (AAPL), Facebook Inc. (FB), NetApp Inc. (NTAP) and Yelp Inc. (YELP).

The Nasdaq Composite Index (RIXF) rose 4 points to 3,729 and the Philadelphia Semiconductor Index (SOX) edged into positive territory.

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