A10 Networks, Inc. — Director's Dealing 2020

May 1, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: A10 Networks, Inc. (ATEN)
CIK: 0001580808
Period of Report: 2020-04-29

Reporting Person: BRUENING MATTHEW P (EVP, Worldwide Sales)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-04-29	Common Stock	A	25000	—	Acquired	25000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2020-04-29	Performance-based Restricted Stock Units	$	A	100000	Acquired	2024-04-29	Common Stock (100000.0)	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 (5/5/2020), 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 100,000 Performance-Based Restricted Stock Units, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day period between April 29, 2020 and April 29, 2024. Vesting is subject to continued employment with the Company through the applicable vesting date, which occurs in three equal annual installments on beginning of the first anniversary of the corresponding performance milestone.