FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 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 * Welsh David S.   2. Issuer Name and Ticker or Trading Symbol Five9, Inc. [FIVN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ADAMS STREET PARTNERS LLC, ONE NORTH WACKER DRIVE SUITE 2200 3. Date of Earliest Transaction (Month/Day/Year) 05/18/2016 (Street) CHICAGO, IL 60606 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 05/18/2016   A   15,000 A $ 0 67,173 D (1)   Common Stock               2,584,821 I See Footnote (2) Common Stock               2,235,689 I See Footnote (3) Common Stock               1,269,991 I See Footnote (4) Common Stock               1,084,176 I See Footnote (5)

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
Welsh David S. C/O ADAMS STREET PARTNERS LLC ONE NORTH WACKER DRIVE SUITE 2200 CHICAGO, IL 60606	X	X

Signatures

/s/ David Hill, attorney-in-fact		05/19/2016
**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)	The reported shares are owned directly by David Welsh, who is a partner of Adams Street Partners, LLC ("ASP"). ASP is the managing member of the general partner of Adams Street 2008 Direct Fund, LP ("AS 2008"), Adams Street 2009 Direct Fund, LP ("AS 2009"), Adams Street 2010 Direct Fund, LP ("AS 2010") and the managing member of the general partner of the general partner of Adams Street 2011 Direct Fund LP ("AS 2011") (such funds collectively, the "Funds"). By agreement with the Funds, Mr. Welsh is deemed to hold the shares for the benefit of the Funds. Mr. Welsh disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein.
(2)	The reported securities are owned directly by AS 2008 (the "Shares") and indirectly by ASP as the managing member of the general partner of AS 2008. The securities owned by AS 2008 may be deemed to be beneficially owned by ASP and David S. Welsh, who is a partner of ASP, and may be deemed to have shared voting and investment power over the shares. Mr. Welsh disclaims beneficial ownership of the Shares except to the extent of his pecuniary interest therein.
(3)	The reported securities are owned directly by AS 2009 (the "Shares") and indirectly by ASP as the managing member of the general partner of AS 2009. The securities owned by AS 2009 may be deemed to be beneficially owned by ASP and David S. Welsh, who is a partner of ASP, and may be deemed to have shared voting and investment power over the shares. Mr. Welsh disclaims beneficial ownership of the Shares except to the extent of his pecuniary interest therein.
(4)	The reported securities are owned directly by AS 2010 (the "Shares") and indirectly by ASP as the managing member of the general partner of AS 2010. The securities owned by AS 2010 may be deemed to be beneficially owned by ASP and David S. Welsh, who is a partner of ASP, and may be deemed to have shared voting and investment power over the shares. Mr. Welsh disclaims beneficial ownership of the Shares except to the extent of his pecuniary interest therein.
(5)	The reported securities are owned directly by AS 2011 (the "Shares") and indirectly by ASP as the managing member of the general partner of AS 2011. The securities owned by AS 2011 may be deemed to be beneficially owned by ASP and David S. Welsh, who is a partner of ASP, and may be deemed to have shared voting and investment power over the shares. Mr. Welsh disclaims beneficial ownership of the Shares except to the extent of his pecuniary interest therein.

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