CHUNG PETER Y 4

What Happened
Peter Chung, a director of A10 Networks, was granted 7,233 restricted stock units (RSUs) on April 22, 2026. The award was reported as an acquisition (award) at $0.00 per share (total reported value $0). The RSUs will settle into an equal number of common shares if Mr. Chung remains in continuous service through the vesting date.

Key Details

• Transaction date: 2026-04-22; Form 4 filed: 2026-04-24 (filed within the standard 2-business-day window).
• Award type/code: A (grant/award). Price: $0.00; reported value: $0.
• Vesting: RSUs vest on the earlier of April 22, 2027 or the Issuer’s next Annual Meeting, and will settle solely in shares contingent on continued service (Footnote F1).
• Holdings reported: The filing notes 207,298 shares and RSUs held in Mr. Chung’s name for the benefit of Summit Partners, L.P.; the grant adds 7,233 RSUs (Footnotes F2–F3).
• Beneficial ownership: Mr. Chung disclaims beneficial ownership of those shares/RSUs except for his pecuniary interest, as they are held for the benefit of Summit Partners, L.P. (Footnote F3).

Context
This is an equity award (not a purchase or sale). Awards to directors are commonly part of standard compensation and do not by themselves indicate a buy or sell signal. The award vests over time and will convert to shares only if Mr. Chung remains with the company through the vesting date.