A10 Networks CFO has 1,743 shares withheld for tax

The CFO's shares were automatically withheld for taxes when a September 30, 2025 restricted stock unit grant vested.

Rhea-AI Filing Summary

A10 Networks, Inc. Chief Financial Officer Michelle Elizabeth Caron had 1,743 common shares automatically withheld for tax purposes on October 5, 2026, at $28.19 per share; her direct holdings afterward were 33,871 shares. The withholding related to a September 30, 2025 restricted stock unit grant that vested on October 5, 2026.

Insider Trade Summary

Tax Withholding: 1,743 shares

Tax Withholding 1 txn

Insider Caron Michelle Elizabeth

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	1,743	$28.19	$49K

Holdings After Transaction: Common Stock — 33,871 shares (Direct)

Footnotes (1)

1. F1. Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a September 30, 2025 restricted stock unit grant that vested on October 5, 2026.

Key Figures

Shares withheld for tax purposes: 1,743 shares Price per share: $28.19 per share Direct shares held after transaction: 33,871 shares

3 metrics

Shares withheld for tax purposes 1,743 shares October 5, 2026

Price per share $28.19 per share October 5, 2026 withholding

Direct shares held after transaction 33,871 shares After the October 5, 2026 transaction

Key Terms

restricted stock unit grant, tax liability, non-discretionary basis

3 terms

restricted stock unit grant financial

"related to a September 30, 2025 restricted stock unit grant"

tax liability financial

"Payment of tax liability by delivering or withholding securities"

non-discretionary basis financial

"automatically withheld, on a non-discretionary basis"

FAQ

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How many ATEN shares did CFO Michelle Elizabeth Caron have withheld?

A10 Networks CFO Michelle Elizabeth Caron had 1,743 common shares automatically withheld for tax purposes on October 5, 2026, at $28.19 per share. Her direct holdings afterward were 33,871 shares.

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

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Available on EDGAR 10/07/2026 - 04:07 PM Accepted by SEC EDGAR 10/07/2026 - 04:07 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^*

Caron Michelle Elizabeth

(Last) (First) (Middle)

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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/05/2026

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)

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	10/05/2026		F		1,743(1)	D	$28.19	33,871	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 a September 30, 2025 restricted stock unit grant that vested on October 5, 2026.

Remarks:

	/s/ Jill Osato, as Attorney-in-Fact	10/07/2026
	** 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)