A10 Networks (ATEN) CEO stock withheld to cover RSU taxes

Rhea-AI Filing Summary

A10 Networks, Inc. chief executive Dhrupad Trivedi reported automatic share withholding for taxes tied to previously granted stock awards. On January 31, 2026, 10,102 shares of common stock were withheld at $17.44 per share from performance-based restricted stock units that vested that day.

On February 1, 2026, a further 61,945 shares were automatically withheld at $17.44 per share from restricted stock units granted in 2023, 2024, and 2025 that vested on that date. After these non-discretionary tax withholdings, Trivedi directly held 690,342 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

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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^*

Trivedi Dhrupad

(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)

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

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		10,102(1)	D	$17.44	752,287	D
Common Stock	02/01/2026		F		61,945(2)	D	$17.44	690,342	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 insider transaction did A10 Networks (ATEN) report for its CEO?

A10 Networks reported that CEO Dhrupad Trivedi had common shares automatically withheld to cover taxes on vested stock units. The withholding involved 10,102 shares on January 31, 2026 and 61,945 shares on February 1, 2026, all at a price of $17.44 per share.

Were A10 Networks CEO Trivedi’s Form 4 transactions open-market sales?

No. The reported transactions reflect shares automatically withheld on a non-discretionary basis for tax purposes, not open-market sales. The withholdings relate to performance-based and time-based restricted stock units that vested on January 31, 2026 and February 1, 2026, respectively, at $17.44 per share.

How many A10 Networks (ATEN) shares does the CEO own after these withholdings?

After the reported tax withholding transactions, CEO Dhrupad Trivedi directly owned 690,342 shares of A10 Networks common stock. This figure reflects ownership following the automatic withholding of 10,102 shares on January 31, 2026 and 61,945 shares on February 1, 2026.

What stock awards triggered the A10 Networks CEO’s tax withholding transactions?

The withholdings stem from performance-based restricted stock units granted on February 21, 2023 that vested January 31, 2026, and restricted stock units granted on February 21, 2023, January 30, 2024, and February 6, 2025, which vested February 1, 2026, prompting automatic tax share withholdings.

At what price were the A10 Networks CEO’s withheld shares valued in the Form 4?

Both reported withholding transactions used a price of $17.44 per share. This price applied to 10,102 shares withheld on January 31, 2026 and 61,945 shares withheld on February 1, 2026, all tied to vested restricted stock unit awards for tax purposes.

What is transaction code “F” in the A10 Networks CEO’s Form 4 filing?

Transaction code “F” in this context indicates shares withheld to pay tax obligations upon vesting of equity awards. For A10 Networks’ CEO, it marks non-discretionary withholding of common shares from vested performance-based and time-based restricted stock units at $17.44 per share.