Sheen George Khoury - 12 Feb 2026 Form 4 Insider Report for A10 Networks, Inc. (ATEN)

Role: Executive VP, Sales and Mktg
Signature: /s/ Jill Osato, as Attorney-in-Fact
Issuer symbol: ATEN
Transactions as of: 12 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 13 Feb 2026, 17:26:00 UTC
Previous filing: 15 Jul 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Khoury Sheen George	Executive VP, Sales and Mktg	2300 ORCHARD PARKWAY, SAN JOSE	/s/ Jill Osato, as Attorney-in-Fact	13 Feb 2026	0002074992

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ATEN	Common Stock	Award	$0	+7,771	+21%	$0.000000	44,294	12 Feb 2026	Direct	F1

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	Award	$0	+7,771		$0.000000	7,771	12 Feb 2026	Common Stock	7,771		Direct	F2, F3

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

Explanation of Responses:

Id	Content
F1	Each share is represented by a Restricted Stock Unit ("RSU"). One-third (1/3) of the total RSUs will vest on each of the first three (3) anniversaries of the Vesting Commencement Date (2/1/2026), provided that the Reporting Person continues to serve through each such vesting date.
F2	Each share is represented by a Performance-based Restricted Stock Unit ("PSU").
F3	Grant of 7,771 PSUs, 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 12, 2026 and February 12, 2030 (each, a "Performance Milestone"). Upon achievement of a Performance Milestone, vesting is subject to continued employment with the Company through the applicable vesting date, the first fifty percent ( 50%) of which will occur within thirty (30) days of achievment of the applicable milestone and the balance to vest twenty-five percent (25%) on each of the first and second anniversaries of achievement of the corresponding Performance Milestone.