By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks were mixed in early trading Wednesday, with Yahoo Inc. and Priceline.com Inc. among the sector leaders on the rise, but Twitter Inc. in the red after getting downgraded by analysts at Cantor Fitzgerald.

Yahoo (YHOO) shares rose 2%, to $35.27 after the company said Tuesday that it would add $5 billion to its share buy-back program. Yahoo also said it raised $1 billion in a convertible debt offering.

Priceline (PCLN) was up by 3.6%, at $1,156 a share after Goldman Sachs added the online travel agency to its conviction buy list.

Among other leading tech stocks, Facebook Inc. (FB) rose 2% to $47.41, Netflix Inc. (NFLX) climbed by 2% to $344.10, and Microsoft Corp. (MSFT), IBM Corp. (IBM), Hewlett-Packard Co. (HPQ) and Oracle Corp. (ORCL) .

The Nasdaq Composite Index (RIXF) rose 5 points to 3,9436, while the Philadelphia Semiconductor Index (SOX) and the Morgan Stanley High Tech 35 Index (MSH) also scored small gains.

Twitter (TWTR) shed 2% to slip to $41. Before the market opened, Cantor Fitzgerald analyst Youssef Squali cut his rating on the microblogging company to hold from buy saying that based on current valuations, Facebook is a more attractive investment among social-networking stocks.

Apple Inc. (AAPL) shares were trimmed by 59 cents to $519. A report earlier this week from Susquehanna Financial Group speculated that Apple might raise the price on its next model of the iPhone in 2014.

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