A10 Networks, Inc. — Director's Dealing 2023

Feb 4, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: A10 Networks, Inc. (ATEN)
CIK: 0001580808
Period of Report: 2023-02-02

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-02-02	Common Stock	M	12179	—	Acquired	129226	Direct
2023-02-02	Common Stock	S	1529	$15.83	Disposed	127697	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-02-02	Performance-based Restricted Stock Units	$0.0	M	12179	Disposed	2026-01-25	Common Stock (12179.0)	Direct

Footnotes

F1: Performance-Based Restricted Stock Units were previously reported on January 27, 2022, 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 trading period between January 25, 2022 and January 25, 2026. The first achievement date occurred on January 23, 2023, as certified by the compensation committee of ATEN, resulting in 12,179 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-third (1/3) on February 13, 2023 and an additional one-third (1/3) to vest on the each of the first and second anniversaries of January 23, 2023, subject to continued employment.

F2: Represents the number of shares automatically sold, on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units.