By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks gained Wednesday, with Amazon.com Inc. receiving some positive attention from Goldman Sachs analyst Heath Terry and Synaptics Inc. is surging after it announced an acquisition to boost its touchscreen technology offerings.

Amazon (AMZN) rose 2.4% to $340.27, after Terry added the company to his "conviction list" and maintained his buy rating on the stock. Terry also raised his price target on Amazon to $430 a share from $400. In a research note, Terry said he believes Amazon's investments in its Web Services business, Amazon Fresh delivery service and digital hardware are "driving incremental growth and furthering Amazon's high returns."

Synaptics (SYNA) shares climbed more than 24%, to $82.54, after the touchscreen technology company said it would acquire Renesas SP Drivers for $475 million. Renesas makes semiconductors that are used to power the touchscreens in tablets and smartphones.

Synaptics also used the acquisition as a reason to raise its fiscal fourth-quarter sales outlook to between $300 million and $310 million from a prior forecast of $275 million to $295 million. Analysts surveyed by FactSet had forecast Synaptics to report sales of $285.6 million for the quarter.

Online professional services referral company Angie's List Inc. (ANGI) was up by 3.7% at $11.91 a share. Before the market opened, Wunderlich Securities analyst Blake Harper raised his rating on Angie's List to buy from hold saying he expects the company to show "improving sales productivity, traction with the e-commerce marketplace, and the rollout of tiered pricing to all markets."

Gains also came from Pandora Media Inc. (P), Yahoo Inc. (YHOO), Apple Inc. (AAPL) and Oracle Corp. (ORCL).

The Nasdaq Composite Index (RIXF) was off by 5 points at 4,332, while the Philadelphia Semiconductor Index (SOX) managed to edge its way into positive territory.

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