KEY POINTS
  • Tesla finished below $600 for the first time since Dec. 4, and has lost 15% on the year.
  • The sell-off comes amidst a bigger drawback in tech stocks, which are valued based on the presumption of heavy growth in future cash flows.
  • Competition and parts shortages are also playing a part.
Tesla Motors CEO Elon Musk unveils a new all-wheel-drive version of the Model S car in Hawthorne, California October 9, 2014.

Shares in Tesla were down as much as 8% Friday morning. They've since recovered to finish down less than 4% as markets showed a dramatic bounceback late on Friday, but the stock has still lost more than 15% of its value the year, and finished below $600 for the first time since Dec. 4.

Here are some of the biggest factors weighing down the cult stock, and knocking the world's wealthiest crown off Elon Musk's head — the CEO owns about 22% of Tesla shares.