A10 Networks, Inc. — Director's Dealing 2025

Oct 2, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: A10 Networks, Inc. (ATEN)
CIK: 0001580808
Period of Report: 2025-09-30

Reporting Person: Caron Michelle Elizabeth (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-30	Common Stock	A	13706	—	Acquired	13706	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-09-30	Performance-based Restricted Stock Units	$	A	13706	Acquired	2029-09-30	Common Stock (13706)	Direct

Footnotes

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.