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

Rhea-AI Filing Summary

A10 Networks Chief Executive Officer Dhrupad Trivedi reported a tax-related share disposition linked to vesting equity awards. On this Form 4, 8,261 shares of common stock were automatically withheld at a price of $18.99 per share to cover taxes on performance-based restricted stock units that vested on February 24, 2026.

These units were originally granted on January 25, 2022. After this non-discretionary tax-withholding disposition, Trivedi directly holds 705,336 shares of A10 Networks common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Trivedi Dhrupad

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	8,261	$18.99	$157K

Holdings After Transaction: Common Stock — 705,336 shares (Direct)

Footnotes (1)

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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^*

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)
02/24/2026

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	02/24/2026		F		8,261(1)	D	$18.99	705,336	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 January 25, 2022, which vested on February 24, 2026.

Remarks:

	/s/ Jill Osato, Attorney-in-fact	02/26/2026
	** 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 CEO Dhrupad Trivedi reported a tax-withholding disposition of 8,261 common shares. The shares were automatically withheld to satisfy taxes due on performance-based restricted stock units that vested, rather than sold in an open-market transaction.

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

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. Shares were automatically withheld on a non-discretionary basis to cover tax obligations tied to vesting performance-based restricted stock units granted earlier.

How many A10 Networks (ATEN) shares were withheld for the CEO’s taxes?

A total of 8,261 A10 Networks common shares were withheld for tax purposes. The withholding was priced at $18.99 per share and related specifically to performance-based restricted stock units that vested on February 24, 2026.

How many A10 Networks (ATEN) shares does the CEO hold after this Form 4?

After the reported tax-withholding disposition, CEO Dhrupad Trivedi directly owns 705,336 A10 Networks common shares. This figure reflects his direct holdings following the automatic share withholding to satisfy the associated tax liability.

What equity awards triggered the tax withholding for A10 Networks (ATEN) CEO?

The tax withholding arose from performance-based restricted stock units granted on January 25, 2022. These units vested on February 24, 2026, and a portion of the resulting shares was automatically withheld to pay the related tax obligations.

What does transaction code F mean in the A10 Networks (ATEN) Form 4?

Transaction code F indicates payment of exercise price or tax liability by delivering securities. In this case, shares of A10 Networks common stock were withheld automatically to cover the CEO’s tax obligations when performance-based restricted stock units vested.