A10 Networks (NYSE: ATEN) GC reports 757-share tax withholding

Rhea-AI Filing Summary

A10 Networks, Inc. reported that General Counsel Robert Scott Weber had 757 shares of common stock automatically withheld at $19.26 per share to cover taxes on performance-based restricted stock units granted on February 21, 2023 and vested on February 28, 2026. After this non-discretionary tax-withholding disposition, he directly holds 54,210 shares of 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

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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)
02/28/2026

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	02/28/2026		F		757(1)	D	$19.26	54,210	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 February 28, 2026.

Remarks:

	/s/ Jill Osato, Attorney-in-fact	03/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did A10 Networks (ATEN) report for Robert Scott Weber?

A10 Networks reported that General Counsel Robert Scott Weber had 757 common shares automatically withheld to cover taxes on vested performance-based restricted stock units. This was a non-discretionary tax-withholding disposition, not an open-market buy or sell transaction.

How many A10 Networks (ATEN) shares were involved in the tax withholding?

The transaction involved 757 shares of A10 Networks common stock withheld at a price of $19.26 per share. These shares were retained for tax purposes related to performance-based restricted stock units that vested on February 28, 2026, rather than being sold in the market.

What is Robert Scott Weber’s A10 Networks (ATEN) share ownership after this Form 4?

After the tax-withholding disposition, Robert Scott Weber directly owns 54,210 shares of A10 Networks common stock. This figure reflects his holdings following the automatic withholding of 757 shares for taxes tied to the vesting of performance-based restricted stock units.

Was the A10 Networks (ATEN) insider transaction an open-market sale?

No, the transaction was not an open-market sale. The 757 shares were automatically withheld on a non-discretionary basis to satisfy tax obligations when performance-based restricted stock units vested, which is recorded under Form 4 code F as a tax-withholding disposition.

What award triggered the A10 Networks (ATEN) tax-withholding transaction?

The tax-withholding transaction was triggered by performance-based restricted stock units granted on February 21, 2023. These units vested on February 28, 2026, at which time 757 shares of common stock were automatically withheld to cover associated tax liabilities for General Counsel Robert Scott Weber.