Tesla stock was falling again Monday—and shares have dropped below a key level that suggests more downside could be ahead.

Tesla stock (ticker: TSLA) is coming off a brutal Friday—a 3.6% loss. The stock opened higher to start the new week—up 0.7% at $208.90—before falling back 4.5% at $198.05. The S&P 500 is flat, while the Dow Jones Industrial Average is up 0.5%.

Source: finance.yahoo.com