Tech stocks got off to a mildly upbeat start Tuesday, with gains coming from the likes of Microsoft Corp. , Hewlett-Packard Co. IBM Corp. . Amazon.com Inc. shares rose $1 a share to $335 one day after the company said it would acquire videogame streaming and playing company Twitch Interactive Inc. for $970 million. The tech-heavy Nasdaq Composite Index rose 6 points to 4,563.

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