Tesla's market value dropped by roughly $80 billion Tuesday

Tesla's market value dropped by roughly $80 billion Tuesday.

Tuesday's 21% tumble edged out the company's 19% slide in January 2012, less than two years after its initial public offering. The company's third- and fourth-largest one-day drops came when it lost nearly 19% on March 16, and 17% on February 5 of this year. The stock rebounded nicely from each of those sell-offs.

And that is what's happening today

Wednesday: The stock is up 9% in early trading. And the stock is still up nearly 300% for the year.