Nissan shares fall sharply after Elon Musk's remarks. Today, Nissan shares fell sharply, falling more than 8% to record heavy losses on the Tokyo Stock Exchange. This decline is due to statements by billionaire Elon Musk, CEO of Tesla, regarding his intention to invest in Nissan. This statement is due to widespread reports about the possibility of a deal between Tesla and Nissan, after a Japanese investment group presented Tesla's plans to acquire Nissan's factories in the United States.