Investors disapproved of Upstart's (UPST -20.95%) fourth-quarter earnings report after the loan originator, which employs artificial intelligence, posted middling results and gave disappointing guidance. As of 10:36 a.m. ET on Wednesday, the stock was down 20.3%. Upstart can't catch a break Upstart delivered smashing results in 2021 when interest rates were low and stimulus checks were flowing, but the business is struggling amid high interest rates. The company said revenue fell 4% to $140 million, which w ...