Matthew P. Bruening - Aug 2, 2021 Form 4 Insider Report for A10 Networks, Inc. (ATEN)

Role: EVP, Worldwide Sales & Mktg
Signature: /s/ Robert Cochran, Attorney-in-fact
Stock symbol: ATEN
Transactions as of: Aug 2, 2021
Transactions value $: -$18,596
Form type: 4
Date filed: 8/12/2021, 04:05 PM
Previous filing: May 7, 2021
Next filing: Aug 20, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ATEN	Common Stock	Options Exercise	$0	+14K	+12.97%	$0.00	122K	Aug 2, 2021	Direct	F1
transaction	ATEN	Common Stock	Options Exercise	$0	+33.3K	+27.38%	$0.00	155K	Aug 10, 2021	Direct	F2
transaction	ATEN	Common Stock	Sale	-$18.6K	-1.39K	-0.9%	$13.34	154K	Aug 10, 2021	Direct	F3

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	Options Exercise	$0	-14K	-33.33%	$0.00	27.9K	Aug 2, 2021	Common Stock	14K		Direct	F1
transaction	ATEN	Performance-based Restricted Stock Units	Options Exercise	$0	-33.3K	-100%	$0.00^*	0	Aug 10, 2021	Common Stock	33.3K		Direct	F2

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

Explanation of Responses:

Id	Content
F1	Performance-Based Restricted Stock Units were previously reported on February 4, 2021, 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 February 2, 2021 and February 2, 2025. The achievement of the first milestone occurred on July 30, 2021, as certified by the compensation committee August 2, 2021, resulting in 13,972 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 August 9, 2021 and an additional one-third (1/3) on each of the first and second anniversaries of July 30, 2021, subject to continued employment. These shares are reflected on Table I.
F2	Performance-Based Restricted Stock Units were previously reported on May 1, 2020, 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 April 29, 2020 and April 29, 2024. The last milestone achievement occurred on August 5, 2021, as certified by the compensation committee of ATEN on August 10, 2021, resulting in 33,334 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 the first, second and third anniversaries of achievement of the milestone, subject to continued employment. These shares are reflected on Table I.
F3	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.