Investors search for reasons the company's market cap grew by $15 billion in one day
But when the world's most valuable company rallies a few points, its market capitalization gets a whole lot bigger. According to the Bespoke Investment Group, Apple's one-day gain Thursday -- $15.4 billion -- was larger than the market cap of half the companies in the S&P 500.
Why Thursday? There are no definitive answers but plenty of theories. Among them:
One footnote: Richard Bloch points out on Seeking Alpha that most of the action Thursday was in the derivatives market, not the stock itself. Volume on the NASDAQ was high, but not record-setting. The options volume, however, was off the charts. See above.
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