Longtime Tesla shareholder Ross Gerber outlined to BI four reasons why the stock is vulnerable to a 50% pullback this year.

Tesla's January sales dropped significantly, particularly in key markets like California and Europe. Elon Musk's company faces heightened competition in China, where BYD has overtaken

Tesla’s financial tale, however, has taken a turn since Trump took the oath of office with Tesla stock down over 17% since Jan. 21, as of midday Friday. Just weeks before the inauguration, Tesla reported the first full-year drop in global sales in its history as a public company, according to a report from CNN.