Leuba Sean P 4

What Happened

• Sean P. Leuba, General Counsel & Secretary of Mayville Engineering Company, sold a total of 9,198 shares in two open-market transactions on March 5, 2026. He sold 2,500 shares at $20.07 ($50,175) and 6,698 shares at $18.81 ($125,989), for combined proceeds of about $176,164.
• This was a sale (disposition) rather than a purchase; sales by insiders can be routine and do not necessarily indicate a change in company outlook.

Key Details

• Transaction dates and prices:
  • 2026-03-05: 2,500 shares sold at $20.07 (proceeds $50,175)
  • 2026-03-05: 6,698 shares sold at $18.81 (proceeds $125,989)
• Total shares sold: 9,198; total proceeds ≈ $176,164.
• Filing: Form 4 filed 2026-03-09 for a 2026-03-05 transaction — filed within the two business-day window (timely).
• Shares owned after transaction: not specified in the details provided here.
• Footnotes in the filing:
  • F1: Reflects most recent ESOP and 401(k) balance.
  • F2: RSUs vest 1/3 on March 15, 2025, 2026 and 2027.
  • F3: RSUs vest 1/3 on March 15, 2026, 2027 and 2028.
  • F4: Options vest 50% on each of Feb 28, 2024 and Feb 28, 2025.
• No 10b5-1 trading plan or other sale plan was referenced in the provided excerpt.

Context

• This report documents sales (code S) rather than purchases or exercises. For retail investors, purchases by insiders often carry clearer signals of confidence; sales can be for many personal reasons (diversification, taxes, liquidity) and are not by themselves proof of negative sentiment.
• The footnotes show some of Leuba’s compensation includes restricted stock units and options with scheduled vesting dates — some holdings may be unvested or subject to vesting schedules.