Tesla's (NASDAQ: TSLA) highly publicized robotaxi event failed to impress investors, who sent its shares tumbling following the presentation. The stock had rallied over the past quarter in anticipation of the event,

Tesla stock vacillated Monday as investors continued to digest what they learned from the company’s Robotaxi Day held Thursday evening.Shares of the electric-vehicle maker opened $220.13, up 1.1%, then slipped to trade as low as $213.

A new design ethos was on full display at the Tesla Robotaxi event, offering some not-so-subtle hints of what to expect from a future sub-$30,000 Tesla.