CHUNG PETER Y 4

What Happened

• Peter Y. Chung, a director of MACOM Technology Solutions Holdings, Inc. (MTSI), was granted 776 restricted stock units (RSUs) on March 6, 2026. The award was reported as an "A" (award/grant) transaction with an acquisition price of $0.00 (no cash paid).

Key Details

• Transaction date: 2026-03-06; Form 4 filed: 2026-03-09 (timely filing).
• Grant: 776 RSUs @ $0.00 (total immediate cash value = $0).
• Vesting/settlement: RSUs vest on March 6, 2027 and will settle solely by delivery of the same number of common shares if Mr. Chung remains in continuous service through vesting (footnote F1).
• Shares/RSUs reported as held: 50,049 shares and restricted stock units are held in Mr. Chung’s name for the benefit of Summit Partners, L.P. (footnote F2).
• Voting/dispositive authority: Summit Partners, L.P., via a two-person Investment Committee (Scott C. Collins and Peter Y. Chung), has voting and dispositive authority over the reported shares/RSUs; the parties disclaim beneficial ownership except for pecuniary interest (footnote F3).
• Transaction code: A = Award/Grant (not a market purchase or sale).

Context

• This was a compensation award to a director (routine director equity compensation), not a market purchase or sale. The RSUs carry no immediate cash cost and will convert into shares only upon vesting next year, so they do not represent an immediate increase or decrease in market-traded shares.