Robert Scott Weber - Mar 10, 2025 Form 4 Insider Report for A10 Networks, Inc. (ATEN)

Role: General Counsel
Signature: /s/ Jill Osato, Attorney-in-fact
Stock symbol: ATEN
Transactions as of: Mar 10, 2025
Transactions value $: -$29,303
Form type: 4
Date filed: 3/11/2025, 09:21 PM
Previous filing: Feb 24, 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ATEN	Common Stock	Options Exercise	$0	+5.96K	+10.08%	$0.00	65K	Mar 10, 2025	Direct	F1
transaction	ATEN	Common Stock	Tax liability	-$29.3K	-1.51K	-2.33%	$19.38	63.5K	Mar 11, 2025	Direct	F2

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	-5.96K	-100%	$0.00	0	Mar 10, 2025	Common Stock	5.96K		Direct	F1

* 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 that were previously reported on February 22, 2023, 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 21, 2023 and February 21, 2027. The second achievement date occurred on February 28, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on March 10, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of February 28, 2025, subject to continued employment. These shares are reflected on Table I.
F2	Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a February 21, 2023 performance restricted stock unit grant that vested on March 10, 2025.

Content

Performance-Based Restricted Stock Units that were previously reported on February 22, 2023, 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 21, 2023 and February 21, 2027. The second achievement date occurred on February 28, 2025, as certified by the compensation committee of ATEN, resulting in 5,956 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on March 10, 2025 and an additional one-fourth (1/4) on each of the first and second anniversaries of February 28, 2025, subject to continued employment. These shares are reflected on Table I.

Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a February 21, 2023 performance restricted stock unit grant that vested on March 10, 2025.