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
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Singer Eric 		2. Issuer Name and Ticker or Trading Symbol

A10 Networks, Inc. [ ATEN ] 		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 A10 NETWORKS, INC., 3 WEST PLUMERIA DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

7/26/2019
(Street)

SAN JOSE, CA 95134
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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, par value $0.00001   7/26/2019     A    30120   A $0   30120   (2) D   (1)  
Common Stock, par value $0.00001                  1658360   I   By Viex Opportunities Fund, LP - Series One   (1) (3) (7)
Common Stock, par value $0.00001                  331977   I   By Viex Opportunities Fund, LP - Series Two   (1) (4) (7)
Common Stock, par value $0.00001                  3531222   I   By Viex Special Opportunities Fund II, LP   (1) (5) (7)
Common Stock, par value $0.00001                  271116   I   By Viex Special Opportunities Fund III, LP   (1) (6) (7)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Call Option (Right to Buy)   $2.50                    7/30/2019   11/15/2019   Common Stock, par value $0.00001   150900     1509   I   By Viex Opportunities Fund, LP - Series Two   (1) (4) (7)
Call Option (Right to Buy)   $2.50                    7/30/2019   11/15/2019   Common Stock, par value $0.00001   150000     1500   I   By Viex Special Opportunities Fund II, LP   (1) (5) (7)
Call Option (Right to Buy)   $5.00                    7/30/2019   11/15/2019   Common Stock, par value $0.00001   5900     59   I   By Viex Special Opportunities Fund II, LP   (1) (5) (7)
Put Option (Obligation to Buy)   $5.00                    7/30/2019   8/16/2019   Common Stock, par value $0.00001   111700     1117   I   By Viex Special Opportunities Fund II, LP   (1) (5) (7)
Put Option (Obligation to Buy)   $7.50                    7/30/2019   8/16/2019   Common Stock, par value $0.00001   1367900     13679   I   By Viex Special Opportunities Fund II, LP   (1) (5) (7)
Put Option (Obligation to Buy)   $7.50                    7/30/2019   11/15/2019   Common Stock, par value $0.00001   200000     2000   I   By Viex Special Opportunities Fund II, LP   (1) (5) (7)
Call Option (Right to Buy)   $2.50                    7/30/2019   11/15/2019   Common Stock, par value $0.00001   210500     2105   I   By Viex Special Opportunities Fund III, LP   (1) (6) (7)
Call Option (Right to Buy)   $5.00                    7/30/2019   11/15/2019   Common Stock, par value $0.00001   5800     58   I   By Viex Special Opportunities Fund III, LP   (1) (6) (7)

Explanation of Responses:
(1)  This Form 4 is filed jointly by VIEX Opportunities Fund, LP - Series One ("Series One"), a series of VIEX Opportunities Fund, LP, VIEX Opportunities Fund, LP - Series Two ("Series Two"), a series of VIEX Opportunities Fund, LP, VIEX Special Opportunities Fund II, LP ("VSO II"), Viex Special Opportunities Fund III, LP ("VSO III"), VIEX GP, LLC ("VIEX GP"), VIEX Special Opportunities GP II, LLC ("VSO GP II"), Viex Special Opportunities GP III, LLC ("VSO GP III"), VIEX Capital Advisors, LLC ("VIEX Capital"), and Eric Singer (collectively, the "Reporting Persons").
(2)  Each share is represented by a restricted stock unit, which vests in three equal annual installments on the anniversary of the grant date of 07/26/2019, provided that the Reporting Person continues to serve through each vesting date.
(3)  Securities of A10 Networks, Inc. (the "Issuer") beneficially owned directly by Series One. VIEX GP, as the general partner of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. VIEX Capital, as the investment manager of Series One, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series One.
(4)  Securities of the Issuer beneficially owned directly by Series Two. VIEX GP, as the general partner of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. VIEX Capital, as the investment manager of Series Two, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two. Mr. Singer, as the managing member of each of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by Series Two.
(5)  Securities of the Issuer beneficially owned directly by VSO II. VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. VIEX Capital, as the investment manager of VSO II, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II. Mr. Singer, as the managing member of each of VSO GP II and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO II.
(6)  Securities of the Issuer beneficially owned directly by VSO III. VSO GP III, as the general partner of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. VIEX Capital, as the investment manager of VSO III, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III. Mr. Singer, as the managing member of each of VSO GP III and VIEX Capital, may be deemed the beneficial owner of the securities of the Issuer beneficially owned by VSO III.
(7)  Each Reporting Person disclaims beneficial ownership of the securities of the Issuer reported herein except to the extent of his or its pecuniary interest therein, and this report shall not be deemed to be an admission that any Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Singer Eric
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134 		X


VIEX Opportunities Fund, LP Series One
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses
VIEX Opportunities Fund, LP - Series Two
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses
VIEX Special Opportunities Fund II, LP
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses
VIEX Special Opportunities Fund III, LP
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses
VIEX GP, LLC
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses
VIEX Special Opportunities GP II, LLC
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses
VIEX Special Opportunities GP III, LLC
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses
VIEX Capital Advisors, LLC
C/O A10 NETWORKS, INC.
3 WEST PLUMERIA DRIVE
SAN JOSE, CA 95134


See Explanation of Responses

Signatures
ERIC SINGER, Name: /s/ Eric Singer 7/30/2019
** Signature of Reporting Person Date

VIEX OPPORTUNITIES FUND, LP - SERIES ONE, By: VIEX GP, LLC, its General Partner, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date

VIEX OPPORTUNITIES FUND, LP - SERIES TWO, By: VIEX GP, LLC, its General Partner, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date

VIEX GP, LLC, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date

VIEX SPECIAL OPPORTUNITIES FUND II, LP, By: VIEX Special Opportunities GP II, LLC, its General Partner, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date

VIEX SPECIAL OPPORTUNITIES GP II, LLC, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date

VIEX SPECIAL OPPORTUNITIES FUND III, LP, By: VIEX Special Opportunities GP III, LLC, its General Partner, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date

VIEX SPECIAL OPPORTUNITIES GP III, LLC, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date

VIEX CAPITAL ADVISORS, LLC, Name: /s/ Eric Singer, Title: Managing Member 7/30/2019
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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