Leonhart Michele M. 4

What Happened

• Michele M. Leonhart, a director of 908 Devices Inc. (MASS), had derivative/RSU activity on June 10–11, 2026. The filing shows an exercise/conversion of 14,083 derivative units on 2026-06-10 (acquired) and a corresponding disposition of 14,083 derivative units on the same date (reported at $0.00). On 2026-06-11 she was granted two RSU awards totaling 19,865 RSUs (13,656 and 6,209 RSUs), each reported at $0.00.
• Reported prices/proceeds are $0 or N/A, so no cash purchase or cash sale value is shown in the filing. Such $0 reporting commonly appears with RSU vesting/conversion and related withholding mechanics; the filing itself does not show cash proceeds.

Key Details

• Transaction dates/prices:
  • 2026-06-10: Conversion/exercise of 14,083 derivative units (acquired) and disposition of 14,083 derivative units (disposed) — price/proceeds reported as N/A and $0.00 respectively.
  • 2026-06-11: Grants of 13,656 RSUs and 6,209 RSUs (total 19,865 RSUs) — reported at $0.00.
• Shares owned after transaction: Not disclosed in this Form 4 filing.
• Relevant footnotes from the filing:
  • F1: Each RSU represents a contingent right to one share when vested.
  • F2: Some RSUs became fully vested on June 10, 2026 (the day prior to the 2026 annual meeting). These RSUs have no expiration.
  • F3: Other RSUs vest on June 11, 2027 (or the day prior to the 2027 annual meeting), subject to continued service; prorated vesting if service terminates. No expiration.
  • F4: Shares underlying an option vest and become exercisable in equal monthly installments over the 12 months following June 11, 2026, subject to continued service.
• Filing timeliness: Form 4 was filed on 2026-06-12 reporting transactions dated 2026-06-10 and 2026-06-11; Form 4 is generally due within two business days, so this filing appears to be timely.

Context

• These entries are primarily award/vesting and derivative conversions (RSUs/options), not open-market purchases or sales for cash. That means the filing documents equity grants and vesting mechanics rather than a market trade expressing a buy/sell opinion.
• For retail investors, awards and vesting show how insiders are compensated and when additional shares may become freely tradeable in the future; they do not by themselves prove a change in the insider’s sentiment about the company.