Their goal: a 20% annual return on each stock over a three- to five-year holding period.

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America's largest company by market value announced Wednesday that it will place a holding period of at least one year on stock gained through options exercise.

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The average holding period for shares traded on the New York Stock Exchange has fallen to four months.

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Fidelity's funds owned the shares for at most six weeks much shorter than the average holding period of about 15 months for U.S. stock funds, according to Morningstar.

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