Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Gupta Sagar 2. Issuer Name and Ticker or Trading Symbol Five9, Inc. [FIVN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O FIVE9, INC., 3001 BISHOP DR., STE. #350 3. Date of Earliest Transaction (Month/Day/Year) 05/20/2026 (Street) SAN RAMON, CA 94583 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/20/2026 A 8,972(1)(2) A $ 0 20,349 D(3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Gupta Sagar C/O FIVE9, INC. 3001 BISHOP DR., STE. #350 SAN RAMON, CA 94583	X

Signatures

/s/ Tiffany Meriweather, Attorney in Fact		05/22/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	On May 20, 2026, Five9, Inc. (the "Issuer") granted a total of 8,972 restricted stock units ("RSUs") of the Issuer to Sagar Gupta, a member of the Issuer's board of directors (the "Board") in respect of his service on the Board. Mr. Gupta holds these RSUs for the benefit of certain investment funds (the "Anson Funds") for which Anson Advisors Inc. and AnsonFunds Management LP serve as co-investment advisors. Each RSU represents a contingent right to receive one share of Common Stock. The RSUs will vest on the one-year anniversary of the grant date, or immediately prior to the Company's next annual meeting of the Company's stockholders at which directors are regularly elected.
(2)	Because Mr. Gupta serves on the Board as a representative of the Anson Funds, Mr. Gupta does not have a right to any economic interest in securities of the Issuer granted to him by the Issuer in respect of his Board position. The Anson Funds are entitled to receive all of the economic interest in securities granted to Mr. Gupta by the Issuer in respect of Mr. Gupta's Board position. Mr. Gupta disclaims beneficial ownership of the Issuer's securities to which this report relates and at no time has Mr. Gupta had any economic interest in such securities except any indirect economic interest through Anson Funds, entities in which he does not have a controlling interest and over which he does not have investment control.
(3)	As discussed in footnotes 1 and 2, represents securities in which the Anson Funds have all of the economic interest.

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