Shares of Tesla dropped by 14.2% as the market closed Thursday, the electric vehicle company’s 11th-worst day on the market ever. At one point in Thursday’s back-and-forth, Trump threatened the federal contracts that funnel billions toward Musk’s companies.

As Elon Musk and Donald Trump take jabs at each other online, their respective businesses are plummeting in value.

Traders dumped Tesla after Musk quickly responded to Trump's criticism with social media posts that stepped up criticism of the president's tax bill.