Definition of "premarket" [premarket]

• Prior to a product's official market release (adjective)
• The informal market in stocks and other securities, held before the official markets open (noun)

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• "Shares jumped 21 cents, or 4.6%, to $4.78 in premarket electronic trading."
• "Shares rose scarcely 9 percent in premarket trading."
• "After a earnings report, Ford shares rose 61 cents, or 8.7 percent, to $7.61 in premarket trading."