By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Sony Corp. rose Monday on an otherwise mixed trading day for tech stocks after the consumer electronics company reported upbeat initial sales for its new PlayStation 4 gaming console in the U.S. and Canada.

Sony (SNE) rose as much as 4% to $7.96 a share in the wake of last Friday's launch of the PlayStation 4 in most of North America. Sony said it sold more than 1 million of the gaming consoles in the first 24 hours after going on sale.

Amazon.com Inc. (AMZN) shares rose 64 cents to $369.99. Evercore Partners analyst Ken Sena raised his price target on Amazon's stock to $450 a share from $400 due to what he sees as higher value coming from the company's Amazon Web Services business.

Other gains came from Yahoo Inc. (YHOO), Google Inc. (GOOG) and Intel Corp. (INTC). The tech-heavy Nasdaq Composite Index (RIXF) was off by 8 points at 3,977 after nearly hitting the 4,000-point mark shortly after the market opened.

Microsoft Corp. (MSFT), which holds its annual shareholders meeting on Tuesday, was off by 1.5% at $37.26 a share. Analysts at Bank of America/Merrill Lynch cut their rating on Microsoft's stock to underperform, or the equivalent of sell, from neutral due to concerns about who may replace Chief Executive Steve Ballmer at the software giant.

Twitter Inc. (TWTR) shed 2% to trade at $43.10. Wunderlich Securities analyst Blake Harper started coverage of the microblogging company with a sell rating and $34-a-share price target. Harper called Twitter "a great company," but with an "overvalued stock."

Nvidia Corp. (NVDA) gave up 2% to trade at $15.85 a share after Morgan Stanley analyst Joseph Moore cut his rating on the graphics chipmaker to underweight.

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