The selloff in the Dow Jones Industrial Average is including all 30 of the index’s components in premarket trading Tuesday, amid growing worries about the effect of the omicron variant of COVID. Dow futures tumbled 423 points, or 1.2% ahead of the open. Among the biggest decliners, shares of American Express Co. fell 2.5%, Boeing Co. shed 2.3%, Goldman Sachs Group Inc. gave up 2.2% and Travelers Companies Inc. lost 2.0%. Meanwhile, the best performer was Microsoft Corp.’s stock , which slipped just 0.2%.

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