Shares of Five9 (FIVN -13.41%) fell 13.4% on Thursday after the cloud contact center platform provider's weak forward guidance overshadowed otherwise-strong fourth-quarter 2023 results. Five9 ended 2023 on a strong note Five9's fourth-quarter 2023 revenue grew 15% year over year to $239.1 million, translating to adjusted (non- GAAP) net income of$45.1 million, or $0.61 per share. Analysts, on average, were only expecting earnings of$0.49 per share on revenue of $238 million. Five9 Chairman and CEO Mike Bu ...