A10 Networks awards Mary C. Henry 7,981 shares

The director's RSUs vest in thirds on each of the first three anniversaries of October 5, 2026, subject to continued service.

Rhea-AI Filing Summary

A10 Networks, Inc. director Mary C. Henry received an award of 7,981 shares of common stock on October 5, 2026, with each share represented by a restricted stock unit (RSU). The award is reported as direct ownership, with direct holdings following the transaction of 7,981 shares. One-third of the RSUs will vest on each of the first three anniversaries of the October 5, 2026 Vesting Commencement Date, provided she continues to serve through each vesting date.

Insider Trade Summary

Grant/Award: 7,981 shares

Grant/Award 1 txn

Insider Henry Mary C

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	7,981	$0.00	$0.00

Holdings After Transaction: Common Stock — 7,981 shares (Direct)

Footnotes (1)

1. 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 (10/5/2026), provided that the Reporting Person continues to serve through each vesting date.

Key Figures

Shares awarded: 7,981 shares Direct holdings following transaction: 7,981 shares Vesting portion: One-third of the RSUs +1 more

4 metrics

Shares awarded 7,981 shares Award reported on October 5, 2026

Direct holdings following transaction 7,981 shares Reported after the award

Vesting portion One-third of the RSUs Vests on each of the first three anniversaries

Vesting anniversaries 3 anniversaries Following the October 5, 2026 Vesting Commencement Date

Key Terms

Restricted Stock Unit, Vesting Commencement Date, vest

3 terms

Restricted Stock Unit financial

"Each share is represented by a Restricted Stock Unit"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

Vesting Commencement Date financial

"Vesting Commencement Date"

The vesting commencement date is the starting point when an employee begins earning ownership rights to their promised benefits, such as stock options or retirement contributions. Think of it like the day a savings account is opened—only after this date do the benefits start to grow and become fully available over time. It matters to investors because it marks when the clock begins ticking toward full ownership, affecting the timing and value of these benefits.

vest financial

"will vest on each of the first three anniversaries"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many ATEN shares did director Mary C. Henry receive?

Mary C. Henry received an award of 7,981 shares of common stock on October 5, 2026, with each share represented by a restricted stock unit.

When do Mary C. Henry's ATEN RSUs vest?

One-third of the RSUs will vest on each of the first three anniversaries of the October 5, 2026 Vesting Commencement Date, provided she continues to serve through each vesting date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/07/2026 - 04:07 PM Accepted by SEC EDGAR 10/07/2026 - 04:06 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Henry Mary C

(Last) (First) (Middle)

C/O A10 NETWORKS

2300 ORCHARD PARKWAY

(Street)

SAN JOSE CALIFORNIA 95131

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
A10 Networks, Inc. [ ATEN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/05/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/05/2026		A		7,981(1)	A	$0	7,981	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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 (10/5/2026), provided that the Reporting Person continues to serve through each vesting date.

Remarks:

	/s/ Jill Osato, as Attorney-in-Fact	10/07/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)