Tesla Inc. TSLA, -10.34% stock ended Thursday at its lowest since March 2017 and under $250 a day after the Silicon Valley car maker posted a wider-than-expected first-quarter loss and revenues that also missed Wall Street expectations. Shares closed 4.4% lower, their largest one-day decline since their 8.2% dip on April 4. It traded as low as $246.07 earlier. Analysts decried Tesla's quarterly results and renewed concerns about margins, demand, and cash position. The stock has lost more than 11% in the past 12 months, versus a gain of 11% for the S&P 500 index. SPX, -2.37%