The 2022 Rivian R1T.Rivian Rivian stock tumbled Friday after reporting its first quarterly results as a public company late Thursday. The maker of electric pickup trucks revealed it will fall short of its 2021 production target due to supply-chain constraints. Rivian also announced the construction of a new factory in Georgia, with EV production expected to begin in 2024. Sign up here for our daily newsletter, 10 Things Before the Opening Bell. Rivian stock sank Friday after revealing late Thursday that production of electric trucks this year would fall short of its target.The EV startup made the disclosure in its first quarterly report since last month's blockbuster initial public offering, which catapulted its market cap past Ford's and General Motors'.But like the rest of the global auto industry, Rivian is suffering from supply-chain constraints that are holding back production.