In this articleRIVNFTSLAAMZNGMRivian R1T Field pickupSource: RivianShares of the electric vehicle start-up Rivian continued to climb Thursday, up about 11%, one day after its public market debut.The Amazon- and Ford-backed company already surpassed both Ford and General Motors by market cap, reaching a valuation of more than $95 billion. That's still far behind Tesla's market