Upstart Holdings Inc (NASDAQ: UPST) shares are flat in Tuesday's after-hours session after the company reported better-than-expected financial results but issued weak guidance. What Happened: Upstart said fourth-quarter revenue decreased 52% year-over-year to $147 million, which beat average analyst estimates of $133.59 million, according to Benzinga Pro. The company reported a quarterly net loss of 25 cents per share, which beat consensus estimates for a loss of 47 cents per share. Loan volume