Matthew P. Bruening - May 8, 2023 Form 4 Insider Report for A10 Networks, Inc. (ATEN)

Role: EVP, Worldwide Sales & Mktg
Signature: /s/ Jill Osato, Attorney-in-fact
Stock symbol: ATEN
Transactions as of: May 8, 2023
Transactions value $: -$38,115
Form type: 4
Date filed: 5/10/2023, 04:22 PM
Previous filing: Mar 15, 2023
Next filing: May 15, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ATEN	Common Stock	Sale	-$38.1K	-2.77K	-2.22%	$13.78	122K	May 8, 2023	Direct	F1

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

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id	Content
F1	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.