X0306 4 2016-06-06 0 0001288847 Five9, Inc. FIVN 0001305625 WELCH SCOTT C/O FIVE9, INC. BISHOP RANCH 8, 4000 EXECUTIVE PARKWAY, SUITE 400 SAN RAMON CA 94583 0 1 0 0 EVP, Cloud Operations Common Stock 2016-06-06 4 S 0 763 11.60 D 236099 D Common Stock 2016-06-06 4 S 0 1047 11.67 D 235052 D The reported sales were to cover taxes upon the vesting of restricted stock units. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.56 to $11.65. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.58 to $11.71. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ David Hill, attorney-in-fact 2016-06-06