Elon Musk said Samsung "agreed to allow Tesla to assist in maximizing manufacturing efficiency" at its chip plant. He will "walk the line personally."

Tesla shares are falling after CEO Elon Musk warned of “a few rough quarters” as the company shifts focus to offering a self-driving taxi service.

Tesla reported second-quarter results after Wednesday's closing bell, unveiling profits and sales in line with Wall Street expectations. Losses mounted for the stock, however, as the company's call with analysts sowed more doubts than offered answers about Tesla's prospects and Chief Executive Elon Musk said he could see potential for "a few rough quarters" ahead.

Tesla shares tumbled in extended trading Wednesday after the EV maker's quarterly results fell short of Wall Street’s expectations and CEO Elon Musk warned of a "few rough quarters" ahead. Monitor these key chart levels.

President Trump extended an olive branch to his friend-turned-critic Elon Musk, saying he has no intention to "destroy" his companies.