Tesla stock is barreling toward a ninth-straight weekly drop, falling another 5% on Tuesday.Shares have now plummeted 53% from record highs reached in mid-December.There are two new factors behind the Tesla sell-off,

Tesla shares tumbled again Tuesday, putting the EV maker's stock on pace to lose ground for the ninth consecutive week. Monitor these major support and resistance levels.

As Tesla stock has fallen in recent weeks, members of the board and an executive at Elon Musk's company have sold off millions of dollars in stock, according to filings.