Apple's stock rose 13-percent this month, thanks to a better than expected earnings report. It's market value increased even more after Warren Buffet announced he bought 75 million additional Apple shares in the first quarter.
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The company hit an all-time high on Monday with a value of about $940 billion.
By comparison, Alphabet, Google's parent company, is worth about $750 billion. Facebook is around $515 billion.
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