STOCK TITAN

A10 Networks (ATEN) CFO converts RSUs; 748 shares withheld for taxes

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

Rhea-AI Filing Summary

A10 Networks, Inc. Chief Financial Officer Michelle Elizabeth Caron reported routine equity compensation activity involving performance-based restricted stock units. On May 14, 2026, she exercised performance-based RSUs into 2,989 shares of common stock at $0.00 per share, following achievement of specified stock price performance conditions. These shares remain subject to time-based vesting, with portions vesting on May 14, 2026 and on the first and second anniversaries of April 27, 2026, contingent on continued employment. On May 15, 2026, 748 shares of common stock were automatically withheld at $27.00 per share to cover tax obligations, a non-discretionary tax-withholding disposition rather than an open-market sale. After these transactions, she directly holds 35,626 shares of A10 Networks common stock.

Positive

  • None.

Negative

  • None.
Insider Caron Michelle Elizabeth
Role Chief Financial Officer
Type Security Shares Price Value
Tax Withholding Common Stock 748 $27.00 $20K
Exercise Performance-based Restricted Stock Units 2,989 $0.00 --
Exercise Common Stock 2,989 $0.00 --
Holdings After Transaction: Common Stock — 35,626 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 2,989 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. Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a Feburary 12, 2026 performance-based restricted stock unit grant that vested on May 14, 2026.
RSUs exercised 2,989 shares Performance-based RSUs converted to common stock on May 14, 2026
Tax-withheld shares 748 shares Shares withheld for taxes at $27.00 per share on May 15, 2026
Post-transaction holdings 35,626 shares Common stock directly held by CFO after reported transactions
Tax withholding price $27.00/share Value used for automatic tax-withholding disposition of 748 shares
RSU exercise price $0.00/share Conversion of performance-based RSUs into common stock
RSU performance window end February 12, 2030 End of 100-day trading period window for stock price performance conditions
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 of common stock"
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
"with vesting 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
"Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a Feburary 12, 2026 performance-based restricted stock unit grant"
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.
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*
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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
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 Stock05/14/2026M2,989(1)A$036,374D
Common Stock05/15/2026F748(2)D$2735,626D
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)05/14/2026M2,989 (1)02/12/2030Common Stock2,989$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 2,989 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. Shares automatically withheld, on a non-discretionary basis, for tax purposes related to a Feburary 12, 2026 performance-based restricted stock unit grant that vested on May 14, 2026.
Remarks:
/s/ Jill Osato, as 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) CFO report?

A10 Networks CFO Michelle Elizabeth Caron exercised 2,989 performance-based RSUs into common stock and had 748 shares automatically withheld to cover taxes. These routine compensation-related transactions left her with 35,626 directly held A10 Networks common shares.

Did the A10 Networks (ATEN) CFO buy or sell shares on the market?

The CFO did not conduct open-market buys or sells. She converted 2,989 performance-based RSUs into common shares and 748 shares were withheld automatically for taxes, a non-discretionary tax-withholding disposition rather than a voluntary market transaction.

How many A10 Networks (ATEN) shares does the CFO hold after these transactions?

Following the reported equity compensation and tax-withholding transactions, CFO Michelle Elizabeth Caron directly holds 35,626 shares of A10 Networks common stock. This figure reflects her position after the RSU conversion and the 748-share tax withholding.

What performance conditions triggered the A10 Networks (ATEN) RSU conversion?

The RSUs converted after A10 Networks stock achieved specified volume weighted average closing price levels over a 100-day trading period between February 12, 2026 and February 12, 2030. The second achievement date occurred April 27, 2026, leading to 2,989 units meeting performance conditions.

What is the vesting schedule for the A10 Networks (ATEN) performance-based RSUs?

Although performance goals were met, the 2,989 performance-based RSUs remain subject to time-based vesting. Half vests on May 14, 2026, and one-fourth vests on each of the first and second anniversaries of April 27, 2026, subject to continued employment.

Why were 748 A10 Networks (ATEN) shares withheld from the CFO?

The 748 shares were automatically withheld on a non-discretionary basis to satisfy tax obligations related to a February 12, 2026 performance-based RSU grant that vested on May 14, 2026. This tax withholding is not considered an open-market sale.