STOCK TITAN

A10 Networks (ATEN) General Counsel exercises performance RSUs, retains 65,527 shares

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

A10 Networks, Inc. General Counsel Robert Scott Weber reported routine equity compensation activity involving performance-based restricted stock units (RSUs). On May 14, 2026, he exercised RSUs that had met performance conditions, converting 3,706 and 3,882 performance-based RSUs into an equal number of common shares at a $0.00 exercise price. These awards vest over time, with one-half vesting on May 14, 2026 and the remaining quarters on the first and second anniversaries of the applicable achievement dates, conditioned on continued employment. On May 15, 2026, 1,930 common shares were automatically withheld at $27.00 per share to satisfy tax obligations related to the RSU vesting. After these transactions, Weber directly holds 65,527 shares of A10 Networks common stock, indicating he retains the vast majority of his equity position following this compensation-related event.

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Insider Weber Robert Scott
Role General Counsel
Type Security Shares Price Value
Tax Withholding Common Stock 1,930 $27.00 $52K
Exercise Performance-based Restricted Stock Units 3,706 $0.00 --
Exercise Performance-based Restricted Stock Units 3,882 $0.00 --
Exercise Common Stock 3,706 $0.00 --
Exercise Common Stock 3,882 $0.00 --
Holdings After Transaction: Common Stock — 65,527 shares (Direct, null); Performance-based Restricted Stock Units — 0 shares (Direct, null)
Footnotes (1)
  1. Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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. The second achievement date occurred on April 27, 2026, as certified by the compensation committee of ATEN, resulting in 3,706 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 27, 2026, subject to continued employment. These shares are reflected on Table I. Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 6, 2025 and February 6, 2029. The second achievement date occurred on May 6, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of May 6, 2026, subject to continued employment. These shares are reflected on Table I. Includes 987 shares and 943 shares automatically 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 unit grant, respectively, each that vested on May 14, 2026.
Tax-withheld shares 1,930 shares at $27.00 Common shares withheld for taxes on May 15, 2026
RSUs exercised (grant 2025) 3,882 units Performance-based RSUs converted to common stock on May 14, 2026
RSUs exercised (grant 2026) 3,706 units Performance-based RSUs converted to common stock on May 14, 2026
Net RSU exercises 7,588 shares Total performance-based RSUs exercised into common stock
Post-transaction holdings 65,527 shares Common stock directly held after transactions
Tax-related components 987 and 943 shares Shares withheld for taxes from 2025 and 2026 RSU grants
Performance-Based Restricted Stock Units financial
"Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, each of which represents a contingent right to receive one share"
Performance-based restricted stock units are a type of employee equity award that converts into company shares only if predefined financial or operational targets are met over a set period. Think of it like a bonus check that becomes stock only when specific goals are hit; it ties pay to results, aligning managers’ incentives with shareholders. Investors care because these awards affect future share count, executive incentives, and signal how management’s success will be measured and rewarded.
volume weighted average closing prices financial
"subject to the achievement of specified levels of the volume weighted average closing prices of a share of ATEN common stock"
time-based vesting conditions financial
"However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half"
tax-withholding disposition financial
"Includes 987 shares and 943 shares automatically withheld, on a non-discretionary basis, for tax purposes"
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.
derivative security financial
"Performance-Based Restricted Stock Units were previously reported ... each of which represents a contingent right to receive one share"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
SEC Form 4
FORM 4UNITED 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*
Weber Robert Scott

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
General Counsel
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock05/14/2026M3,706(1)A$063,575D
Common Stock05/14/2026M3,882(2)A$067,457D
Common Stock05/15/2026F1,930(3)D$2765,527D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Performance-based Restricted Stock Units(1)05/14/2026M3,706 (1)02/12/2030Common Stock3,706$00D
Performance-based Restricted Stock Units(2)05/14/2026M3,882 (2)02/06/2029Common Stock3,882$00D
Explanation of Responses:
1. Performance-Based Restricted Stock Units that were previously reported on February 13, 2026, 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. The second achievement date occurred on April 27, 2026, as certified by the compensation committee of ATEN, resulting in 3,706 units meeting the appropriate performance-based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of April 27, 2026, subject to continued employment. These shares are reflected on Table I.
2. Performance-Based Restricted Stock Units were previously reported on February 10, 2025, 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 6, 2025 and February 6, 2029. The second achievement date occurred on May 6, 2026, as certified by the compensation committee of ATEN, resulting in 3,882 units meeting the appropriate performance based conditions. However, these shares remain subject to time-based vesting conditions and will therefore vest as to one-half (1/2) on May 14, 2026 and an additional one-fourth (1/4) on each of the first and second anniversaries of May 6, 2026, subject to continued employment. These shares are reflected on Table I.
3. Includes 987 shares and 943 shares automatically 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 unit grant, respectively, each that vested on May 14, 2026.
Remarks:
/s/ Jill Osato, Attorney-in-fact05/15/2026
** Signature of Reporting PersonDate
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 transactions did A10 Networks (ATEN) report for Robert Scott Weber?

A10 Networks reported that General Counsel Robert Scott Weber exercised performance-based RSUs into common stock and had shares withheld for taxes. The filing shows routine compensation-related equity activity rather than open-market buying or selling.

How many A10 Networks (ATEN) shares did Robert Scott Weber acquire through RSU exercises?

Weber exercised 3,706 and 3,882 performance-based restricted stock units, receiving an equal number of A10 Networks common shares. These units had met specified stock-price performance conditions and are subject to ongoing time-based vesting tied to his continued employment.

How many A10 Networks (ATEN) shares were withheld for taxes in this Form 4?

A total of 1,930 A10 Networks common shares were automatically withheld at $27.00 per share to cover tax obligations. This included 987 shares and 943 shares tied to separate performance-based RSU grants that vested on May 14, 2026.

What is Robert Scott Weber’s A10 Networks (ATEN) shareholding after these transactions?

After the reported RSU exercises and tax-withholding disposition, Weber directly holds 65,527 shares of A10 Networks common stock. This indicates he retains a substantial equity stake following the compensation-related activity disclosed in the Form 4.

How do the performance-based RSUs for A10 Networks (ATEN) vest for Robert Scott Weber?

The performance-based RSUs vest after stock-price targets over 100-day trading periods are achieved, then follow time-based vesting. Once certified, one-half vests on May 14, 2026, with one-fourth on each of the next two anniversaries, subject to continued employment.