Amazon lost nearly $1 billion on its Rivian investment last week

Shares of Rivian Automotive Inc. rose Monday, but only after it just suffered its worst week since going public, in the wake of the electric-vehicle maker’s disappointing earnings report. That selloff has been pretty painful to some high-profile corporate investors in the company. Amazon.com Inc. AMZN, -0.05%is Rivian’s largest shareholder with a stake of about 158.4 million shares, or 16.6% of the shares outstanding.Last week’s selloff in Rivian’s stock RIVN, +7.45%lower