A10 Networks (ATEN) CEO has 10,101 shares withheld to cover RSU taxes

Rhea-AI Filing Summary

A10 Networks, Inc. Chief Executive Officer Dhrupad Trivedi reported a tax-related share disposition. On February 28, 2026, 10,101 shares of common stock were automatically withheld on a non-discretionary basis to cover taxes tied to performance-based restricted stock units that vested the same day. These RSUs were originally granted on February 21, 2023. Following this tax-withholding disposition, Trivedi directly beneficially owns 695,235 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)
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		10,101(1)	D	$19.26	695,235	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 CEO Dhrupad Trivedi?

A10 Networks CEO Dhrupad Trivedi reported a tax-withholding disposition of 10,101 common shares. The shares were automatically withheld to cover taxes on performance-based RSUs that vested on February 28, 2026, rather than sold in an open-market transaction.

How many A10 Networks (ATEN) shares were withheld for CEO Trivedis taxes?

A total of 10,101 A10 Networks common shares were automatically withheld for CEO Dhrupad Trivedis tax obligations. The withholding relates to performance-based restricted stock units granted on February 21, 2023, which vested on February 28, 2026, triggering the tax event.

At what price were A10 Networks (ATEN) shares valued in the tax-withholding transaction?

The 10,101 withheld A10 Networks shares were valued at $19.26 per share for tax purposes. This valuation is used solely to determine the number of shares needed to satisfy the associated tax liability on the vested performance-based restricted stock units.

How many A10 Networks (ATEN) shares does CEO Dhrupad Trivedi own after the transaction?

After the tax-withholding disposition, CEO Dhrupad Trivedi directly beneficially owns 695,235 A10 Networks common shares. This figure reflects his holdings following the automatic withholding of 10,101 shares used to satisfy tax obligations on vested performance-based RSUs.

Was the A10 Networks (ATEN) CEOs Form 4 transaction an open-market sale?

The reported Form 4 transaction was not an open-market sale. Shares were automatically withheld on a non-discretionary basis to pay taxes on vesting performance-based restricted stock units, meaning no discretionary sale decision was made by the CEO.