144 0001940974 XXXXXXXX LIVE 0001288847 FIVE9 INC COM 001-36383 3001 Bishop Drive, Suite 350 San Ramon CA 94583 9252012000 PANOS KOZANIAN Officer COMMON Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 38th Fl. New York NY 10004

9860 784757.40 72695935 12/04/2023 NASDAQ Common 12/03/2023 Restricted Stock Units Issuer N 9860 12/03/2023 N/A N 10b5-1 Sales Plan for PANOS KOZANIAN

3001 Bishop Drive, Suite 350 San Ramon CA 94583

Common 09/05/2023 9858 699170.76 PANOS KOZANIAN

3001 Bishop Drive, Suite 350 San Ramon CA 94583

Common 09/05/2023 1144 81121.04 12/04/2023 12/14/2022 /s/ Panos Kozanian