Statement of Changes in Beneficial Ownership (Form 4)

Ownership Submission

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. 20549STATEMENT 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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1. Name and Address of Reporting Person * SUMMIT PARTNERS L P 2. Issuer Name and Ticker or Trading Symbol A10 Networks, Inc. [ATEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 222 BERKELEY STREET , 18TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) (Street) BOSTON MA 02116 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Join/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code 4. Securities Acquired (A) or Disposed of (D) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) 6. Ownership Form: Direct (D) or Indirect (I) 7. Nature of Indirect Beneficial Ownership Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivate Security	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	5. Number of Derivative Securities Acquired (A) or Disposed of (D)	6. Date Exercisable and Expiration Date	7. Title and Amount of Securities Underlying Derivative Security	8. Price of Derivative Security	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)	11. Nature of Indirect Beneficial Ownership
Code	V	(A)	(D)	Date Exercisable	Expriation Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
Director	10% Owner	Officer	Other
SUMMIT PARTNERS L P 222 BERKELEY STREET 18TH FLOOR BOSTON, MA02116
SUMMIT PARTNERS GE VIII, L.P. 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116	X			GP of 10% owner
Summit Partners GE VIII, LLC 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116	X			GP of 10% owner
Summit Investors Management, LLC 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116				Manager of GP of 10% Owner
Summit Partners Growth Equity Fund VIII-A, L.P. 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116		X
Summit Partners Growth Equity Fund VIII-B, L.P. 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116		X
Summit Investors I, LLC 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116		X
Summit Investors I (UK), L.P. 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116		X
SUMMIT MASTER COMPANY, LLC 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116				Manager of Manager of 10% owne
MANNION MARTIN J C/O SUMMIT PARTNERS 222 BERKELEY STREET, 18TH FLOOR BOSTON, MA02116				Manager of GP of 10% owner

Signatures

Summit Partners Growth Equity Fund VIII-B, L.P. By: /s/ Summit Partners Growth Equity Fund VIII-B, L.P., by Summit Partners GE VIII, L.P., its GP, by Summit Partners GE VIII, LLC, its GP, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Master Company, LLC By: /s/ Summit Master Company, LLC, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Investors Management, LLC By: /s/ Summit Investors Management, LLC, by Summit Master Company, LLC, its Managing Member, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Investors I, LLC By: /s/ Summit Investors I, LLC, by Summit Investors Management, LLC, its Manager, by Summit Master Company, LLC, its Managing Member, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Investors I (UK), L.P. By: /s/ Summit Investors I (UK), L.P., by Summit Investors Management, LLC, its General Partner, by Summit Master Company, LLC, its Managing Member, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Partners Growth Equity Fund VIII-A, L.P. By: /s/ Summit Partners Growth Equity Fund VIII-A, L.P., by Summit Partners GE VIII, L.P., its GP, by Summit Partners GE VIII, LLC, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Partners, L.P. By: /s/ Summit Partners, L.P., by Summit Master Company, LLC, its GP, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Partners GE VIII, LLC By: /s/ Summit Partners GE VIII, LLC, by Summit Partners, L.P., its Manager, by Summit Master Company, LLC, its General Partner, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Summit Partners GE VIII, L.P. By: /s/ Summit Partners GE VIII, L.P., by Summit Partners GE VIII, LLC, its General Partner, by Summit Partners, L.P., its Manager, by Summit Master Company, LLC, its General Partner, by Adam H. Hennessey, Member	2022-06-28
**Signature of Reporting Person	Date
Martin J. Mannion By: /s/ Adam H. Hennessey, POA for Martin J. Mannion	2022-06-28
**Signature of Reporting Person	Date

Explanation of Responses:

(*)	If the form is filed by more than one reporting person, see Instruction 5(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)	Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will vest on June 24, 2023, and will settle solely by delivery of an equal number of shares of Common Stock provided that Mr. Chung remains in continuous service with the Issuer through the vesting date.
(2)	The Common Stock is held as follows: 6,362,818 shares in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,324,553 shares in the name of Summit Partners Growth Equity Fund VIII-B, L.P.; 37,202 shares in the name of Summit Investors I, LLC; 3,273 shares in the name of Summit Investors I (UK), L.P.; 160,360 shares and restricted stock units in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P.
(3)	Summit Partners, L.P. is the managing member of Summit Partners GE VIII, LLC, which is the general partner of Summit Partners GE VIII, L.P., which is the general partner of each of Summit Partners Growth Equity Fund VIII-A, L.P. and Summit Partners Growth Equity Fund VIII-B, L.P. Summit Master Company, LLC is the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC and the general partner of Summit Investors I (UK), L.P. Summit Partners GE VIII, LLC, as the general partner of Summit Partners GE VIII, L.P., and Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC has each delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee responsible for voting and investment decisions with respect to the Company. Summit Partners, L.P., through a two-person Investment Committee, responsible for voting and investment decisions with respect to the Issuer, currently composed of Martin J. Mannion and Peter Y. Chung, has voting and dispositive authority over the shares and restricted stock units reported herein and therefore may be deemed to beneficially own such shares. Each of the Summit entities, Mr. Mannion and Mr. Chung each disclaim beneficial ownership of the shares of common stock and the restricted stock units, except to the extent of their respective pecuniary interest therein.

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