Tesla shares have dropped dramatically since peaking in December, and Tuesday's decline pushed the company's market cap below $1 trillion.

KEY POINTS

  • Tesla shares sank 8% on Tuesday and have now lost most of their gains that followed Donald Trump’s election victory in November.
  • The stock has plunged 25% this year, while the Nasdaq is down just 1.5%.
  • Reuters reported on Monday that the company’s long-awaited upgrade of its partially automated driving system in China left owners unimpressed.