Tech stocks put in a weak early performance Wednesday, with declines coming from the likes of IBM Corp. , Microsoft Corp. , Amazon.com Inc. and Google Inc. . Cisco Systems Inc. was off by 2 cents a share at $25.13 ahead of the networking equipment-maker's quarterly results, due after the close of trading. Yahoo Inc. , however, rose 1.5% to $49.77 after saying late Tuesday it will acquire video-ad platform company Brightroll for $640 million. The tech-heavy Nasdaq Composite Index fell almost 9 points to 4,651.
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