Rivian Now World’s No. 3 Carmaker By Value As Post-IPO Stock Surge Rolls On $Rivian Automotive, Inc.(RIVN)$, the best-funded electric vehicle startup in U.S. history, continued to gain stock market momentum days after its Nasdaq debut–so much so that the California company currently ranks as the world’s third most valuable automaker, topped only by Tesla and Toyota. Shares of Rivian jumped about 15% to close at $149.36 on Monday. That pushed its market capitalization to $146.3 billion. The shares are up 38% since trading began on Nov. 10. The Amazon-backed startup, which only began building its battery-powered R1T pickup truck last month, won’t deliver many vehicles this year. The electric-vehicle start-up Lucid&nb