CHUNG PETER Y 4

What Happened

• Peter Y. Chung, a director of MACOM Technology Solutions Holdings, Inc. (MTSI), disposed of 43,268 shares on May 14, 2026 in an open-market or private sale. The weighted-average price reported was $378.20 per share (prices ranged $377.80–$379.44), for total proceeds of approximately $16,363,923. The filing notes the shares were sold in multiple transactions and the reporting person will provide a per-price breakdown on request.

Key Details

• Transaction date: May 14, 2026; Transaction type: Sale (S) — open-market or private sale.
• Price: Weighted-average $378.20; reported execution prices ranged from $377.80 to $379.44 (footnote F1).
• Shares sold: 43,268; gross proceeds ≈ $16,363,923.
• Shares owned after transaction: Not explicitly stated in the report. Footnote F2/F3 states 6,781 shares and restricted stock units are held in Mr. Chung’s name for the benefit of Summit Partners, L.P.; Summit Partners has voting/dispositive authority and may be deemed to beneficially own those holdings (they disclaim ownership except for pecuniary interest).
• Filing date/timeliness: Form 4 was filed May 18, 2026 (covers the May 14 transaction) — appears timely (filed within the SEC’s two-business-day window). Footnote F1 confirms multiple trade prices and an undertaking to provide per-price details on request.

Context

• This sale appears connected to holdings held for the benefit of Summit Partners, L.P., an investment vehicle over which Mr. Chung and another partner share committee authority; such trades can reflect institutional disposition rather than a personal view of the company. Sales are common insider transactions and, unlike purchases, are typically less informative about insider sentiment.