A10 Networks (ATEN) discloses insider stock gift and tax withholding

Rhea-AI Filing Summary

A10 Networks’ General Counsel reported routine changes in personal stock ownership. The filing shows a bona fide gift of 600 shares of common stock to a tax-exempt public charity on 12/12/2025, recorded at $0 per share.

On 12/15/2025, 925 shares were automatically withheld at $18.12 per share to cover taxes related to a restricted stock unit grant that vested on December 13, 2025. After these transactions, the officer directly owns 55,925 shares of A10 Networks common stock, including 1,437 shares previously acquired through the company’s employee stock purchase plan.

Insider Trade Summary

600 shares gifted

Mixed 2 txns

Insider Weber Robert Scott

Role General Counsel

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	925	$18.12	$17K
Gift	Common Stock	600	$0.00	--

Holdings After Transaction: Common Stock — 55,925 shares (Direct)

Footnotes (1)

1. Represents a bona fide gift by Reporting Person to a tax-exempt public charity under Section 501(c)(3) of the Internal Revenue Code. Includes an aggregate of 1,437 shares acquired by the Reporting Person on May 31, 2025 and November 30, 2025 pursuant to the Issuer's Employee Stock Purchase Plan. Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a January 30, 2024 restricted stock unit grant that vested on December 13, 2025.

Form 4 Insider Transactions: What Each Field Means →

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^*

Weber Robert Scott

(Last) (First) (Middle)

C/O A10 NETWORKS, INC.

2300 ORCHARD PARKWAY

(Street)

SAN JOSE CA 95131

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

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

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

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

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	12/12/2025		G		600(1)	D	$0	56,850(2)	D
Common Stock	12/15/2025		F		925(3)	D	$18.12	55,925	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. Represents a bona fide gift by Reporting Person to a tax-exempt public charity under Section 501(c)(3) of the Internal Revenue Code.

2. Includes an aggregate of 1,437 shares acquired by the Reporting Person on May 31, 2025 and November 30, 2025 pursuant to the Issuer's Employee Stock Purchase Plan.

3. Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a January 30, 2024 restricted stock unit grant that vested on December 13, 2025.

Remarks:

	/s/ Jill Osato, Attorney-in-fact	12/16/2025
	** 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.

FAQ

What insider transactions did A10 Networks (ATEN) disclose in this filing?

The filing reports two transactions by the General Counsel: a bona fide gift of 600 shares of A10 Networks common stock to a tax-exempt public charity on 12/12/2025, and the automatic withholding of 925 shares on 12/15/2025 to cover taxes on a restricted stock unit vesting.

How many A10 Networks (ATEN) shares does the reporting person own after these transactions?

Following the reported gift and tax withholding, the General Counsel directly owns 55,925 shares of A10 Networks common stock.

Was the 600-share transaction by the A10 Networks (ATEN) insider a sale?

No. The 600-share transaction is identified with transaction code G, and the explanation states it is a bona fide gift to a tax-exempt public charity under Section 501(c)(3) of the Internal Revenue Code.

Why were 925 A10 Networks (ATEN) shares withheld from the insider?

The 925 shares were automatically withheld, on a non-discretionary basis, for tax purposes related to a restricted stock unit grant dated January 30, 2024 that vested on December 13, 2025.

What price is associated with the 925 A10 Networks (ATEN) shares withheld for taxes?

The 925 shares withheld for taxes are reported at a price of $18.12 per share.

Does the A10 Networks (ATEN) insider’s ownership include employee stock purchase plan shares?

Yes. The reported ownership includes an aggregate of 1,437 shares acquired on May 31, 2025 and November 30, 2025 under A10 Networks’ Employee Stock Purchase Plan.