Form DEFA14A Five9, Inc.

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April 7, 2026 4:04 PM EDT

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 14A
(Rule 14a-101)
INFORMATION REQUIRED IN PROXY STATEMENT
SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No.     )

Filed by the Registrant   x
Filed by a Party other than the Registrant   o
Check the appropriate box:
oPreliminary Proxy Statement
oConfidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
oDefinitive Proxy Statement
xDefinitive Additional Materials
oSoliciting Material under §240.14a-12
Five9, Inc.
(Name of Registrant as Specified In Its Charter)
n/a
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check the appropriate box):
x
No fee required.
o
Fee paid previously with preliminary materials.
o
Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11








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