A10 Networks (ATEN) director Eric Singer receives 7,233-share RSU award

Rhea-AI Filing Summary

Singer Eric reported acquisition or exercise transactions in this Form 4 filing.

A10 Networks, Inc. director Eric Singer received a grant of 7,233 shares of Common Stock in the form of Restricted Stock Units. The RSUs will vest on the earlier of April 22, 2027, or the company’s next annual meeting, if he continues serving through that date. Following this award, he holds 93,504 shares directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Singer Eric

Role null

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

Holdings After Transaction: Common Stock — 93,504 shares (Direct, null)

Footnotes (1)

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Key Figures

RSU Grant Size: 7,233 shares Award Price: $0.00 per share Post-transaction holdings: 93,504 shares +1 more

4 metrics

RSU Grant Size 7,233 shares Restricted Stock Unit award to director on April 22, 2026

Award Price $0.00 per share Stated transaction price for RSU grant

Post-transaction holdings 93,504 shares Common Stock held directly after the RSU grant

RSU Vesting Date April 22, 2027 Latest possible vesting date, or earlier at next Annual Meeting

Key Terms

Restricted Stock Unit ("RSU"), vest, Annual Meeting

3 terms

Restricted Stock Unit ("RSU") financial

"Each share is represented by a Restricted Stock Unit ("RSU")."

vest financial

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

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

Annual Meeting financial

"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.

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^*

Singer Eric

(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
	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	93,504	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. Each share is represented by a Restricted Stock Unit ("RSU"). The RSUs will vest on the earlier of April 22, 2027 or the date of the Issuer's next Annual Meeting, provided that the Reporting Person continues to serve through each such vesting date.

Remarks:

	/s/ Jill Osato, Attorney-in-fact	04/22/2026
	** 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)

FAQ

What insider transaction did A10 Networks (ATEN) director Eric Singer report?

Eric Singer reported an acquisition of 7,233 shares of A10 Networks Common Stock through a Restricted Stock Unit grant. These shares were awarded at no cash cost per share as part of his director compensation, rather than being bought on the open market.

How many A10 Networks (ATEN) shares does Eric Singer hold after this Form 4?

After the RSU grant, Eric Singer holds 93,504 shares of A10 Networks Common Stock directly. This total includes the 7,233 newly granted RSU-based shares, which are subject to vesting conditions tied to service and the company’s next annual meeting date.

When do Eric Singer’s new A10 Networks (ATEN) RSUs vest?

The 7,233 Restricted Stock Units vest on the earlier of April 22, 2027, or the date of A10 Networks’ next annual shareholder meeting. Vesting is contingent on Eric Singer continuing to serve as a director through the applicable vesting date specified in the award terms.

Did Eric Singer buy or sell A10 Networks (ATEN) shares for cash in this filing?

No cash purchase or sale occurred; Eric Singer received 7,233 shares via a Restricted Stock Unit grant at a stated price of $0.00 per share. This reflects an equity compensation award, not an open-market trade or a discretionary buy or sell decision.

What does the RSU structure mean for A10 Networks (ATEN) director compensation?

The filing shows Eric Singer’s compensation includes 7,233 Restricted Stock Units that convert into shares if vesting conditions are met. This structure ties part of director pay to continued service and company equity, aligning compensation with long-term share ownership.