
HP Inc (NYSE; HPQ) shares rallied Thursday after Warren Buffett's Berkshire Hathaway Inc. (NYSE: BRK-A) (NYSE: BRK-B) revealed a new 121-million-share stake in HP worth about $4.2 billion.
In a new filing, Berkshire said it now holds roughly an 11% ownership stake in HP, a major vote of confidence from one of the most famous and successful investors of all time.