Form 4: Khoury Sheen George reports acquisition/exercise transactions in ATEN

Rhea-AI Filing Summary

Khoury Sheen George reported acquisition or exercise transactions in a Form 4 filing for ATEN. The filing lists transactions totaling 15,542 shares. Following the reported transactions, holdings were 7,771 shares.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Khoury Sheen George

Role Executive VP, Sales and Mktg

Type	Security	Shares	Price	Value
Grant/Award	Performance-based Restricted Stock Units	7,771	$0.00	--
Grant/Award	Common Stock	7,771	$0.00	--

Holdings After Transaction: Performance-based Restricted Stock Units — 7,771 shares (Direct); Common Stock — 44,294 shares (Direct)

Footnotes (1)

1. Each share is represented by a Restricted Stock Unit ("RSU"). One-third (1/3) of the total RSUs will vest on each of the first three (3) anniversaries of the Vesting Commencement Date (2/1/2026), provided that the Reporting Person continues to serve through each such vesting date. Each share is represented by a Performance-based Restricted Stock Unit ("PSU"). Grant of 7,771 PSUs, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day trading period between February 12, 2026 and February 12, 2030 (each, a "Performance Milestone"). Upon achievement of a Performance Milestone, vesting is subject to continued employment with the Company through the applicable vesting date, the first fifty percent ( 50%) of which will occur within thirty (30) days of achievment of the applicable milestone and the balance to vest twenty-five percent (25%) on each of the first and second anniversaries of achievement of the corresponding Performance Milestone.

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^*

Khoury Sheen George

(Last) (First) (Middle)

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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive VP, Sales and Mktg

3. Date of Earliest Transaction (Month/Day/Year)
02/12/2026

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	02/12/2026		A		7,771(1)	A	$0	44,294	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
Performance-based Restricted Stock Units	(2)	02/12/2026		A		7,771		(3)	02/12/2030	Common Stock	7,771	$0	7,771	D

Explanation of Responses:

1. Each share is represented by a Restricted Stock Unit ("RSU"). One-third (1/3) of the total RSUs will vest on each of the first three (3) anniversaries of the Vesting Commencement Date (2/1/2026), provided that the Reporting Person continues to serve through each such vesting date.

2. Each share is represented by a Performance-based Restricted Stock Unit ("PSU").

3. Grant of 7,771 PSUs, each of which represents a contingent right to receive one share of common stock of ATEN, with vesting subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock during any one hundred (100) day trading period between February 12, 2026 and February 12, 2030 (each, a "Performance Milestone"). Upon achievement of a Performance Milestone, vesting is subject to continued employment with the Company through the applicable vesting date, the first fifty percent ( 50%) of which will occur within thirty (30) days of achievment of the applicable milestone and the balance to vest twenty-five percent (25%) on each of the first and second anniversaries of achievement of the corresponding Performance Milestone.

Remarks:

	/s/ Jill Osato, as Attorney-in-Fact	02/13/2026
	** 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 Khoury Sheen George?

A10 Networks reported that executive vice president Khoury Sheen George received equity awards on 02/12/2026. He acquired 7,771 shares of common stock at $0 and 7,771 performance-based restricted stock units, both held directly as part of his compensation.

How many A10 Networks (ATEN) shares does Khoury Sheen George own after this Form 4?

After the reported grant, Khoury Sheen George directly holds 44,294 shares of A10 Networks common stock. He also holds 7,771 performance-based restricted stock units, each representing a contingent right to receive one additional share if specified conditions are met.

What are the vesting terms for Khoury Sheen George’s A10 Networks RSUs?

The time-based restricted stock units vest over three years. One-third of the total RSUs vests on each of the first three anniversaries of the 02/01/2026 vesting commencement date, provided Khoury Sheen George continues to serve through each applicable vesting date.

How do the performance-based restricted stock units (PSUs) at A10 Networks vest?

The 7,771 PSUs vest only if A10 Networks stock hits specified volume-weighted average price levels during any 100-day trading period from February 12, 2026 to February 12, 2030, and if Khoury Sheen George remains employed through each related vesting date.

Are Khoury Sheen George’s A10 Networks equity awards open-market purchases?

No, the Form 4 identifies these as grants, not open-market purchases. Both the 7,771 common shares and 7,771 performance-based restricted stock units were acquired at a price of $0 as compensation awards, rather than through buying shares in the market.

How is PSU vesting for A10 Networks (ATEN) structured after a performance milestone is reached?

Once a performance milestone is achieved, 50% of the related PSUs vest within 30 days. The remaining 50% vests in two equal 25% installments on the first and second anniversaries of that milestone, assuming continued employment through each vesting date.