Trading Trump’s tweets would have left you sad and poorer

Donald Trump tweets about a company, and its shares quake at his wrath.

The president now is aiming at auto companies, trying to bludgeon Ford F, -3.28% , General Motors GM, -1.99% , and Toyota TM, -0.07% into expanding small-car production in the U.S. — reversing decades-old trends of moving manufacturing of mostly lower-priced, often-unprofitable cars to Mexico, even as Mexican presidents past and present flip The Donald the bird.

Stop quaking. Trump’s Twitter TWTR, +0.48% missives have no lasting effect on stocks. I created a list of affected companies , generated by Yahoo Finance, then deleted the privately owned ones.

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