Matthew Tuckness plan to sell securities of Five9, Inc. under Form 144

Matthew Tuckness filed Form 144 to notify SEC of plan to sell 11173 units of Five9, Inc. securities around 2026-06-04, with aggregate market value of $279,658.98. The total outstanding units is 74723569.0. The amount planned to be sold represents 0.01% of total outstanding units; Recent transactions in past 3 months include: On 03/04/2026, sold 5164 units for $92280.68;