By Philip Elmer-DeWitt
March 29, 2013

FORTUNE — At 3.07% of total market value, Apple (AAPL) is still the single largest component of the S&P 500. But for the past nine months — for better or worse — it’s gone its own way.

See also: The S&P 500’s P/E is headed for a 3-year high. Not Apple’s.

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