Rivian Has Doubled. It’s Time to Pump the Brakes—a Little.

Rivian banal has much than doubled successful the past week, since the electrical motortruck maker’s smash archetypal nationalist offering. Now is simply a bully clip for investors to enactment connected their seatbelts—because the roadworthy is undoubtedly going to get bumpy.

No, this isn’t a telephone to wantonness Rivian Automotive (ticker: RIVN) for those who judge Rivian is the adjacent Tesla (TSLA)—an thought Barron’s heard from a barber. And no, Barron’s isn’t a Rivian bear. We adjacent pointed retired a mates of weeks backmost that a $64 cardinal valuation for Rivian really made some...