908 Devices (MASS) SVP John Kenneweg Exercises Options, Sells 27,656 Shares

What Happened
John Kenneweg, SVP Sales & Product Marketing at 908 Devices (MASS), exercised a total of 27,656 options (exercise price $0.96) and immediately sold the resulting 27,656 shares across Sept 15–17, 2026. He paid roughly $26,550 to exercise the options and received about $280,071 from the open-market sales (gross), for approximate net proceeds of $253,521. The shares underlying the options were fully vested and immediately exercisable.

Key Details

• Transactions and prices:
  • 2026-09-15: Exercised 1,000 shares @ $0.96 (cost $960); sold 1,000 shares @ $10.00 (proceeds $10,000).
  • 2026-09-16: Exercised 21,399 shares @ $0.96 (cost $20,543); sold 21,399 shares @ $10.11 (proceeds $216,344).
  • 2026-09-17: Exercised 5,257 shares @ $0.96 (cost $5,047); sold 5,257 shares @ $10.22 (proceeds $53,727).
  • Total exercised/acquired: 27,656 shares (total exercise cost ≈ $26,550).
  • Total sold/disposed: 27,656 shares for total proceeds ≈ $280,071 (net ≈ $253,521 after exercise cost).
• Footnotes and plan:
  • Trades were made under a Rule 10b5-1 trading plan adopted June 12, 2026 (F1).
  • Some sale prices are reported as weighted averages with price ranges; the filer will provide breakdowns on request (F2, F3).
  • The option shares were fully vested and immediately exercisable (F4).
• Ownership and filing timing:
  • The filing does not disclose Kenneweg’s post-transaction total ownership.
  • Form 4 was filed on 2026-09-17 (timely within the usual two-business-day reporting window).

Context
This was an exercise-and-sell sequence (effectively a cashless exercise): the insider exercised vested options and sold all resulting shares immediately. Such transactions are commonly used to capture gains or cover option costs and, when done under a 10b5-1 plan, are pre-arranged to avoid trading-window issues. The filing is informational — it shows the mechanics and proceeds but does not indicate Kenneweg’s future view of the company.