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That's the difference between what a stock is worth at the end of a certain period of time (usually today) and what it was worth at the beginning of the period (usually the date of purchase) divided by what it was worth at the beginning of the period.

For example, if you buy $200 worth of stocks, and a year later those stocks are worth $230, that's a 15% change (($230 - $200) / $200 = 30/200 = 15/100). If those stocks are worth $170 after a year, that's a -15% change (($170 - $200) / $200).

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13y ago

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