Michelle Elizabeth Caron - 30 Sep 2025 Form 4 Insider Report for A10 Networks, Inc. (ATEN)

Role: Chief Financial Officer
Signature: /s/ Jill Osato, as Attorney-in-Fact
Issuer symbol: ATEN
Transactions as of: 30 Sep 2025
Net transactions value: $0
Form type: 4
Filing time: 02 Oct 2025, 16:12:13 UTC
Previous filing: 26 Sep 2025
Next filing: 13 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Caron Michelle Elizabeth	Chief Financial Officer	2300 ORCHARD PARKWAY, SAN JOSE	/s/ Jill Osato, as Attorney-in-Fact	02 Oct 2025	0002085974

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ATEN	Common Stock	Award	$0	+13,706		$0.000000	13,706	30 Sep 2025	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ATEN	Performance-based Restricted Stock Units	Award	$0	+13,706		$0.000000	13,706	30 Sep 2025	Common Stock	13,706		Direct	F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each share is represented by a Restricted Stock Unit ("RSU"). One-fourth (1/4) of the total RSUs will vest on each of the first four (4) anniversaries of the Vesting Commencement Date (10/5/2025), provided that the Reporting Person continues to serve through each vesting date.
F2	Each share is represented by a Performance-based Restricted Stock Unit ("PSU").
F3	Grant of 13,706 PSUs, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of a specified level of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day period between September 30, 2025 and September 30, 2029 (the "Performance Milestone"). Upon achievement of the Performance Milestone, vesting is subject to continued employment with the Company through the applicable vesting date, which occurs in three installments, with the vesting of the first fifty percent (50%) to occur within thirty (30) days of achievement of the Performance Milestone and an additional twenty-five percent (25%) on each of the first and second anniversaries of the date of achievement of the Performance Milestone.