KEY POINTS
  • Musk sent the tweet referring to the "Shortseller Enrichment Commission" hours after the judge handling his settlement agreement with the SEC ordered both parties to explain why the court should approve it.
  • The company's stock has been volatile throughout much of 2018 and is down more than 12 percent this year.

Tesla shares took another leg down Friday afternoon after hedge fund manager and Tesla short David Einhorn of Greenlight Capital criticized the automaker in his third-quarter letter to investors.

Einhorn likened Tesla to defunct investment firm Lehman Brothers, which fell during the financial crisis of 2008. Einhorn is well known for correctly predicting the bank would fall.