Wall Street’s outlook on Tesla Inc. is darkening rapidly, with at least two analysts turning more cautious on the electric vehicle maker in as many days.

Unprofitable Vietnamese electric vehicle maker VinFast Auto Pte Ltd. is now worth more than the likes of Goldman Sachs Group and Boeing Co.

A gravity-defying rally in electric vehicle startup Nikola Corp. is showing no signs of stopping, as the company’s latest efforts to conserve cash and secure funds reignites a stock fervor.

Rivian Automotive Inc. may get pushed out of the Nasdaq 100 Index as early as this month after plunging more than 90% from its record high, according to JP Morgan Securities.

After a $280 billion rally since late May, Tesla Inc. is using a trusted method for fueling further gains — a stock split. It may not pan out like that.

Even a breakthrough U.S. climate bill designed to encourage sales of electric cars has failed to revive investor interest in Rivian Automotive Inc., as the risk-hungry traders who catapulted its shares to dizzying heights last year shun companies for whom profitability is still years away.

The latest warning sign for U.S. stocks is emerging from a corner of the market that investors closely watch to get a read on the state of the economy and the health of American consumers: Transportation shares.

Self-driving technology companies are the latest automotive stocks to become an obsession of retail traders, with firms like Aurora Innovation Inc. surging Nov. 19 on high volume.

A searing five-day rally in the shares of Rivian Automotive Inc. has led the electric truck startup to more than double in value since last week’s trading debut, with its market capitalization now surpassing Volkswagen AG.

Tesla Inc. has joined the trillion-dollar-valuation club as the member with the lowest revenue.