A10 Networks (ATEN) General Counsel reports tax share withholdings

Rhea-AI Filing Summary

A10 Networks (ATEN) General Counsel Robert Scott Weber reported routine share withholding for taxes tied to vesting stock awards. On January 31, 2026, 836 shares of common stock were automatically withheld at $17.44 per share in connection with performance-based restricted stock units granted on February 21, 2023 that vested that day.

On February 1, 2026, an additional 4,614 shares were automatically withheld at $17.44 per share for tax obligations related to restricted stock units granted on February 21, 2023, January 30, 2024 and February 6, 2025, which vested on February 1, 2026. After these non-discretionary tax withholdings, Weber directly held 49,451 shares of A10 Networks common stock.

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

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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)
01/31/2026

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	01/31/2026		F		836(1)	D	$17.44	54,065	D
Common Stock	02/01/2026		F		4,614(2)	D	$17.44	49,451	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. Shares automatically withheld, on a non-discretionary basis, for tax purposes related to performance-based restricted stock units granted on February 21, 2023, which vested on January 31, 2026.

2. Shares automatically withheld, on a non-discretionary basis, for tax purposes related to restricted stock units granted on February 21, 2023, January 30, 2024 and February 6, 2025, each of which vested on February 1, 2026.

Remarks:

	/s/ Jill Osato, Attorney-in-fact	02/03/2026
	** 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.

FAQ

What does the latest Form 4 for A10 Networks (ATEN) report?

The Form 4 shows A10 Networks General Counsel Robert Scott Weber had shares automatically withheld to cover taxes on vesting stock awards. These were non-discretionary tax withholdings, not open-market sales, and relate to previously granted restricted stock units and performance-based units.

How many A10 Networks shares were withheld for taxes in this Form 4?

The filing shows 836 shares withheld on January 31, 2026 and 4,614 shares withheld on February 1, 2026. Both transactions used a price of $17.44 per share and were for tax obligations on vesting restricted stock and performance-based units.

What is Robert Scott Weber’s role at A10 Networks (ATEN)?

Robert Scott Weber is listed as an officer of A10 Networks with the title General Counsel. The Form 4 reflects his beneficial ownership and the tax-related share withholdings tied to his equity compensation awards in the company’s common stock.

How many A10 Networks shares does Robert Scott Weber own after these transactions?

After the reported tax withholdings, Robert Scott Weber directly owns 49,451 shares of A10 Networks common stock. This figure appears in the Form 4 as the amount of securities beneficially owned following the February 1, 2026 transaction described in the filing.

Were the A10 Networks (ATEN) share transactions discretionary sales by the insider?

No. Footnotes explain the shares were automatically withheld on a non-discretionary basis for tax purposes. The withholdings relate to vesting performance-based restricted stock units and restricted stock units granted between February 2023 and February 2025.

Which stock awards triggered the tax withholdings in the A10 Networks Form 4?

The first withholding relates to performance-based restricted stock units granted on February 21, 2023 that vested January 31, 2026. The second covers restricted stock units granted on February 21, 2023, January 30, 2024 and February 6, 2025, all vesting on February 1, 2026.