Shares of Apple Inc. ran up 1.2% toward a second-straight record high in morning trade Monday, after billionaire investor Warren Buffett's Berkshire Hathaway Inc. disclosed it more than doubled its stake in Apple during the first quarter. The stock hit an all-time intraday high of $150.95 earlier. Berkshire said in a filing released late Friday that its owned $19.2 billion worth of Apple stock as of March 31, up from $7.1 billion worth on Dec. 31. Apple's stock soared 24% during the first quarter, compared with the Dow Jones Industrial Average's 4.6% gain. Since March 31, Apple's stock has gained 5%, which could have increased the value of Buffett's investment to over $20 billion.
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