All the stocks within the Dow Jones Industrial Average that are trading ahead of Friday's open--28 of the 30 components--are dropping sharply, as the U.K. vote to exit the European Union has left global markets in disarray. Dow futures plunged 537 points, or 3%. Among the Dow stocks hit the hardest premarket, shares of Goldman Sachs Group Inc. tumbled 7%, J.P. Morgan Chase & Co. dropped 6.4%, American Express Co. shed 4.4%, Caterpillar Inc. slid 4.2% and General Electric Co. gave up 4.1%. The best performer was Procter & Gamble Co.'s stock , which was down just 2.3%. Shares of DuPont Co. and Merck & Co. were the only stock still inactive.
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