By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks put in a mixed trading performance Thursday, with much of the sector advancing, yet losses from the likes of bellwether Cisco Systems Inc., NetApp Inc. and Angie's List Inc. have negatively affected the sector's performance.

Cisco (CSCO) shares fell 4.6%, to $21.81 after the networking-equipment leader reported fiscal second-quarter earnings and sales late Wednesday that beat Wall Street analysts forecasts, but also fell from a year ago. Cisco officials also said business was being hampered by a slowing down of sales in emerging markets.

Storage-technology company NetApp Inc. (NTAP) fell almost 6%, to $40.15 a share. On Wednesday, NetApp reported third-quarter earnings that beat expectations, but also gave a sales outlook that feel short of analysts' estimates.

Angie's List (ANGI) tumbled by more than 17%, to fall to $14.18 a share on negative reaction to the online professional-services and recommendation company's first-quarter outlook. Angie's List expects its first-quarter sales to be between $71.5 million and $72.5 million. Analysts surveyed by FactSet had forecast Angie's List to post sales of $74.3 million for the quarter.

While those losses stood out, a slate of gainers also emerged as trading progressed.

Apple Inc. (AAPL) was up by 1% at $541.80. A report from Bloomberg said Apple is planning a new version of the Apple TV set-top box, and is working with Time Warner Cable Inc. (TWC) to provide content for the device.

Online travel site Orbitz Worldwide Inc. (OWW) surged more than 30%, to $9.05 a share, after the company reported upbeat quarterly results that were aided by strong bookings of hotels and vacation packages.

Advances also came from Netflix Inc. (NFLX), Facebook Inc. (FB), Microsoft Corp. (MSFT) and Yahoo Inc. (YHOO).

The Nasdaq Composite Index (RIXF) rose by 19 points to 4,220 and the Philadelphia Semiconductor Index (SOX) was up by almost 1%.

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