In many respects, HP (HPQ) has earned the stamp of approval from billionaire investor Warren Buffett.Buffett’s Berkshire Hathaway revealed it owned 121 million shares of HP in a new filing Wednesday evening. The investment — valued at $4.2 billion — gives Berkshire Hathaway a roughly 11.4% stake in HP.Shares surged 11% in pre-market trading.”Berkshire Hathaway…
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