Shares of Tesla (NASDAQ: TSLA) climbed higher today. The electric vehicle (EV) maker's stock gained 4.7% as of market close, but was up as much as 7.8% earlier in the day. The jump comes as the S&P 500 (SNPINDEX: ^GSPC) lost 0.

Tesla (TSLA) shares jumped Friday, extending Thursday’s gains fueled by trade deal optimism after President Donald Trump announced a trade agreement with the U.K. and suggested more deals are on the way.

Piper Sandler analyst Alexander Potter took a look at Tesla’s self-driving technology ahead of a planned robo-taxi launch in June. What he found might concern investors.