Investors fear that the dispute between Elon Musk and President Donald Trump "will stop their friendship and change the regulatory environment for Tesla on the autonomous front over the coming years under the Trump administration,

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.

Key TakeawaysTesla shares plunged 14% on Thursday amid an intensifying spat between CEO Elon Musk and President Donald Trump.The price broke down from a rising wedge pattern this week, indicating a resumption of the stock’s longer-term downtrend that started in December.