A10 Networks CEO updates Form 4 tax withholding

A10 Networks, Inc. Chief Executive Officer Dhrupad Trivedi filed an amended insider report to correct the share price used in a prior tax-withholding entry.

Rhea-AI Filing Summary

A10 Networks, Inc. Chief Executive Officer Dhrupad Trivedi filed an amended insider report to correct the share price used in a prior tax-withholding entry. The amendment reflects 32,858 shares of common stock withheld on a non-discretionary basis at $28.03 per share to satisfy taxes on performance-based restricted stock units that vested on May 14, 2026. After this routine tax-withholding disposition, Trivedi directly holds 887,847 shares of A10 Networks common stock.

Insider Trade Summary

Exercise Price or Tax Liability: 32,858 shares

Exercise Price or Tax Liability 1 txn

Insider Trivedi Dhrupad

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	32,858	$28.03	$921K

Holdings After Transaction: Common Stock — 887,847 shares (Direct)

Footnotes (1)

1. F1. This amendment to the original Form 4 filed on May 15, 2026 is being filed to correct the price reported in Column 4 of Table I in connection with the shares withheld, on a non-discretionary basis, for tax purposes related to a February 6, 2025 performance-based restricted stock unit grant and a February 12, 2026 performance-based restricted stock unti grant, each that vested on May 14, 2026.

Key Figures

Shares withheld for taxes: 32,858 shares Corrected tax-withholding price: $28.03 per share Shares held after transaction: 887,847 shares +3 more

6 metrics

Shares withheld for taxes 32,858 shares Non-discretionary tax-withholding disposition of common stock

Corrected tax-withholding price $28.03 per share Price used for withheld shares in amended Form 4/A

Shares held after transaction 887,847 shares CEO’s direct common stock holdings following tax withholding

RSU grant date 1 February 6, 2025 Performance-based restricted stock unit grant referenced in footnote

RSU grant date 2 February 12, 2026 Second performance-based RSU grant referenced in footnote

Vesting date May 14, 2026 Vesting date for the performance-based RSU grants

Key Terms

tax-withholding disposition, performance-based restricted stock unit, Form 4 amendment

3 terms

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition" for 32,858 shares of common stock"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

performance-based restricted stock unit financial

"related to a February 6, 2025 performance-based restricted stock unit grant"

A performance-based restricted stock unit is a promise of company shares given to an employee that only becomes actual stock if specific performance targets are met and any required time at the company is completed. For investors, these awards matter because they can dilute existing shares when earned and signal management’s confidence or the company’s expected future performance, much like a bonus cheque that only clears when pre-set goals are reached.

Form 4 amendment regulatory

"This amendment to the original Form 4 filed on May 15, 2026 is being filed"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

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

The Form 4/A shows A10 Networks CEO Dhrupad Trivedi corrected the reported price on a prior tax-withholding transaction. It now reflects 32,858 shares withheld at $28.03 per share tied to vested performance-based restricted stock units.

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

The filing reports that 32,858 shares of A10 Networks common stock were withheld on a non-discretionary basis for tax purposes. These shares relate to performance-based restricted stock units that vested for the CEO on May 14, 2026.

What price per share is reported in the amended A10 Networks (ATEN) Form 4/A?

The amended Form 4/A corrects the price to $28.03 per share for the 32,858 shares withheld. This revised figure replaces an earlier price entry in Column 4 for the tax-withholding disposition of common stock.

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

After the tax-withholding disposition, CEO Dhrupad Trivedi directly holds 887,847 shares of A10 Networks common stock. This figure reflects his remaining direct ownership following the non-discretionary withholding for tax obligations.

What awards triggered the A10 Networks (ATEN) CEO tax-withholding entry?

The tax-withholding relates to performance-based restricted stock unit grants dated February 6, 2025 and February 12, 2026. Both grants vested on May 14, 2026, leading to non-discretionary share withholding to cover the CEO’s associated tax liabilities.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/15/2026 - 07:18 PM Learn about SEC filing dates

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 CALIFORNIA 95131

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)
05/15/2026

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	05/15/2026		F		32,858	D	$28.03(1)	887,847	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. This amendment to the original Form 4 filed on May 15, 2026 is being filed to correct the price reported in Column 4 of Table I in connection with the shares withheld, on a non-discretionary basis, for tax purposes related to a February 6, 2025 performance-based restricted stock unit grant and a February 12, 2026 performance-based restricted stock unti grant, each that vested on May 14, 2026.

Remarks:

	/s/ Jill Osato, Attorney-in-fact	05/15/2026
	** 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.
* Form 4: SEC 1474 (03-26)