A10 Networks director awarded 7,233 RSUs

CHUNG PETER Y reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

CHUNG PETER Y reported acquisition or exercise transactions in this Form 4 filing.

A10 Networks, Inc. reported that director Peter Y. Chung received a grant of 7,233 restricted stock units (RSUs) of Common Stock as part of the director compensation program. These RSUs vest on the earlier of April 22, 2027 or the company’s next Annual Meeting.

Upon vesting, the RSUs will settle in an equal number of A10 Networks common shares, provided Mr. Chung remains in continuous service through the vesting date. After this grant, 207,298 shares and RSUs are held in his name for the benefit of Summit Partners, L.P., and he disclaims beneficial ownership except for his pecuniary interest.

Insider Trade Summary

Grant/Award: 7,233 shares

Grant/Award 1 txn

Insider CHUNG PETER Y

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	7,233	$0.00	$0.00

Holdings After Transaction: Common Stock — 207,298 shares (Indirect, See Remarks)

Footnotes (3)

1. F1. Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will vest on the earlier of April 22, 2027, or the date of the Issuer's next Annual Meeting, and will settle solely by delivery of an equal number of shares of Common Stock provided that Mr. Chung remains in continuous service with the Issuer through the vesting date.
2. F2. The 207,298 shares and restricted stock units are held in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P.
3. F3. Mr. Chung holds any Common Stock and restricted stock units for the benefit of Summit Partners, L.P. and Mr. Chung disclaims beneficial ownership of the shares of common stock and the restricted stock units, except to the extent of their pecuniary interest therein.

Key Figures

RSUs granted: 7,233 restricted stock units Grant price: $0.0000 per share Post-grant holdings: 207,298 shares and RSUs +1 more

4 metrics

RSUs granted 7,233 restricted stock units Director compensation grant to Peter Y. Chung on April 22, 2026

Grant price $0.0000 per share RSU award granted without cash payment by Chung

Post-grant holdings 207,298 shares and RSUs Held in Chung’s name for benefit of Summit Partners, L.P.

Vesting date trigger April 22, 2027 or next Annual Meeting RSUs vest on earliest of these dates with continuous service

Key Terms

restricted stock units, director compensation program, Annual Meeting, beneficial ownership, +1 more

5 terms

restricted stock units financial

"Represents restricted stock units granted to Mr. Chung as part of the director compensation program."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

director compensation program financial

"Represents restricted stock units granted to Mr. Chung as part of the director compensation program."

Annual Meeting financial

"The restricted stock units will vest on the earlier of April 22, 2027, or the date of the Issuer's next Annual Meeting"

A company's annual meeting is a yearly gathering where owners (shareholders) and the board review performance, ask questions, and vote on key matters like electing directors, approving auditor choices, and sometimes setting pay or dividend policies. For investors it matters because decisions made and votes cast can change who runs the company, influence strategy and payouts, and affect the value or direction of their investment—similar to a homeowners’ meeting where rules and leaders that shape your property’s value are decided.

beneficial ownership financial

"Mr. Chung disclaims beneficial ownership of the shares of common stock and the restricted stock units"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of their pecuniary interest therein."

FAQ

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

What did A10 Networks (ATEN) disclose in this Form 4 for Peter Y. Chung?

A10 Networks disclosed that director Peter Y. Chung received 7,233 restricted stock units as part of the director compensation program. These RSUs vest later and will settle in common shares, held for the benefit of Summit Partners, L.P., subject to service conditions.

How many A10 Networks (ATEN) RSUs were granted to director Peter Y. Chung?

Peter Y. Chung was granted 7,233 restricted stock units of A10 Networks Common Stock. The units are compensation for his board service and will convert into an equal number of shares once vested, assuming he continues serving the company through the vesting date.

When do Peter Y. Chung’s A10 Networks (ATEN) restricted stock units vest?

The RSUs granted to Peter Y. Chung vest on the earlier of April 22, 2027, or the date of A10 Networks’ next Annual Meeting. Vesting also requires he remain in continuous service with the company through that vesting date before settlement in common shares.

Who benefits economically from Peter Y. Chung’s A10 Networks (ATEN) shares and RSUs?

The shares and restricted stock units held in Peter Y. Chung’s name are for the benefit of Summit Partners, L.P. He disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest, clarifying that the primary economic interest lies with Summit Partners.

How many A10 Networks (ATEN) shares and RSUs are held in Peter Y. Chung’s name after this grant?

After the reported RSU grant, a total of 207,298 A10 Networks shares and restricted stock units are held in Peter Y. Chung’s name. According to the filing, these securities are held for the benefit of Summit Partners, L.P., not solely for Chung personally.

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

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Accepted by SEC EDGAR 04/24/2026 - 04:03 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^*

CHUNG PETER Y

(Last) (First) (Middle)

C/O SUMMIT PARTNERS

222 BERKELEY STREET, 18TH FLOOR

(Street)

BOSTON MASSACHUSETTS 02116

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/22/2026

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	04/22/2026		A		7,233(1)	A	$0	207,298(2)	I	See Remarks(3)

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. Represents restricted stock units granted to Mr. Chung as part of the director compensation program. The restricted stock units will vest on the earlier of April 22, 2027, or the date of the Issuer's next Annual Meeting, and will settle solely by delivery of an equal number of shares of Common Stock provided that Mr. Chung remains in continuous service with the Issuer through the vesting date.

2. The 207,298 shares and restricted stock units are held in the name of Mr. Chung, which are held for the benefit of Summit Partners, L.P.

3. Mr. Chung holds any Common Stock and restricted stock units for the benefit of Summit Partners, L.P. and Mr. Chung disclaims beneficial ownership of the shares of common stock and the restricted stock units, except to the extent of their pecuniary interest therein.

	/s/Adam H. Hennessey, POA for Peter Y. Chung	04/24/2026
	** 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)