Tesla’s stock is driven by sentiment, which has soured greatly. Plus, Musk has now alienated Republicans and Democrats alike.

A breakdown in relations between President Trump and Elon Musk slammed Tesla stock Thursday, along with assets associated with the U.S. leader. Tesla shares regained some ground early Friday. Shares of Musk’s electric-vehicle maker rose around 4% in morning trading.

The rift between President Donald Trump and Tesla chief Elon Musk has captivated the world as a political drama, but it has also become a Wall Street spectacle, highlighting the risk to equity markets from the world's biggest stocks.