Shares of Tesla Inc. /zigman2/quotes/203558040/composite TSLA +0.95% dropped 1.9% in morning trading Tuesday, to put them on track to suffer a fourth-straight decline. That would be the longest losing streak for the electric vehicle maker's stock since six-day stretch ended March 18. The current streak comes ahead of Tesla's third-quarter earnings report, which is scheduled to be released after Wednesday's closing bell. The stock has shed 8.4% during its current losing streak, which followed a six-day win streak in which the stock rallied 11.4%. The stock is now 15.2% below its Aug. 31 record close of $498.32. Over the same time, the S&P 500 /zigman2/quotes/210599714/realtime SPX +0.88% has slipped 1.4%. Among other EV makers, shares of Nio Inc. /zigman2/quotes/204905836/composite NIO -5.09% rose 0.6% in morning trading Tuesday, Nikola Corp. /zigman2/quotes/208704275/composite NKLA -0.53% edged up 0.2% and Workhorse Group Inc. /zigman2/quotes/207314632/composite WKHS -2.65% fell 3.9%.