Apple Inc.'s stock is shedding 3.4% in active premarket trade Friday, as the U.K. vote to leave the European Union put global markets in disarray. Only about 2.3% of Apple's revenue over the past 12 months came from the U.K., but overall exposure to Europe is 15.4%, according data provided by FactSet's proprietary algorithm. The U.K.'s benchmark FTSE 100 Index was tumbling 4.6%, and the Stoxx Europe 600 Index was plunging 7%.
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