Peter Y. Chung - 22 Apr 2026 Form 4 Insider Report for A10 Networks, Inc. (ATEN)

Reporting relationship: Director
Issuer ticker: ATEN
Reported as of: 22 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 24 Apr 2026, 16:03:48 UTC
Prior SEC filing: 09 Mar 2026
Next SEC filing: 18 May 2026
Source filing: View source filing
Reporting owner signature: /s/Adam H. Hennessey, POA for Peter Y. Chung

Key filing fact

Peter Y. Chung filed Form 4 for A10 Networks, Inc. (ATEN) on 24 Apr 2026.

Key facts

This page summarizes Peter Y. Chung's Form 4 filing for A10 Networks, Inc. (ATEN).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 24 Apr 2026, 16:03.

Change

Previous filing in this sequence was filed on 09 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001239366 Primary reporting owner

CHUNG PETER Y

Relationship: Director
Address: C/O SUMMIT PARTNERS, 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/Adam H. Hennessey, POA for Peter Y. Chung
Signature date: 24 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ATEN transaction

Common Stock

Award

Transaction value
Shares: +7,233
Change %: +3.6%
Price: $0.000000^*
Shares after: 207,298
Date: 22 Apr 2026
Ownership: See Remarks
Footnotes: F1, F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote 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.

Footnote 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.

Footnote 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.