HRUSOVSKY E KEVIN 4

4 · 908 Devices Inc. · Filed Jun 12, 2026

AI-generated summary of this filing

Updated Jun 12, 2026

908 Devices (MASS) Director E. Kevin Hrusovsky Exercises RSUs, Receives Awards

What Happened

E. Kevin Hrusovsky, a director of 908 Devices Inc. (MASS), reported conversion/exercise of 14,083 derivative shares on June 10, 2026, and two RSU awards on June 11, 2026 totaling 19,865 RSUs (13,656 + 6,209). The filing shows $0.00 prices for the reported dispositions and the RSU awards; no open‑market buy or sale for cash was reported. The conversion on June 10 reflects vested RSUs becoming shares; the simultaneous $0.00 disposition in the filing is consistent with settlement/withholding activity rather than a cash sale.

Key Details

Transaction dates and types:
- 2026-06-10: Exercise/conversion of derivative (Form 4 code M) — 14,083 shares acquired (conversion) and 14,083 shares disposed at $0.00 (reported as derivative disposition).
- 2026-06-11: Grants/awards (code A) — 13,656 RSUs and 6,209 RSUs, both reported at $0.00.
Shares owned after transaction: not specified in the filing.
Footnote highlights:
- Each RSU converts to one share upon vesting (F1). The RSUs that vested became fully vested on June 10, 2026 (F3).
- The June 11, 2026 RSU awards generally vest by June 11, 2027 (or the day before the 2027 annual meeting), subject to continued service and prorated vesting if the reporting person leaves (F4).
- An option-related award will vest monthly over the 12 months following June 11, 2026 (F5).
- Securities are held by the E. Kevin Hrusovsky 2012 Irrevocable Trust; the reporting person may be deemed the beneficial owner (F2).
Timeliness: Form 4 was filed 2026-06-12 for transactions on 2026-06-10–06-11, which is within the typical two-business‑day reporting window.

Context

Code M indicates exercise or conversion of a derivative (here, vested RSUs converting into shares). The $0.00 disposition reported at conversion is commonly used in filings to reflect withholding or settlement related to vesting rather than a market sale. The June 11 entries are new RSU awards (no cash exchanged) that vest over time per the footnotes. These transactions are award/vesting mechanics rather than open‑market buys or sales.

Form 4

Period: 2026-06-10

Director

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-06-10+14,083→ 165,390 total
Exercise/Conversion
Restricted Stock Units
[F1][F3]
2026-06-10−14,083→ 0 total
→ Common Stock (14,083 underlying)
Award
Restricted Stock Units
[F1][F4]
2026-06-11+13,656→ 13,656 total
→ Common Stock (13,656 underlying)
Award
Stock Option (option to buy)
[F5]
2026-06-11+6,209→ 6,209 total
Exercise: $8.22Exp: 2036-06-10→ Common Stock (6,209 underlying)

Holdings

Footnotes (5)

[F1]Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
[F2]The securities are owned directly by the E. Kevin Hrusovsky 2012 Irrevocable Trust. The reporting person's spouse and children are trustees of E. Kevin Hrusovsky 2012 Irrevocable Trust and have joint voting and dispositive control with respect to all securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust and the reporting person may be deemed to be the beneficial owner of the securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust.
[F3]The RSUs became fully vested on June 10, 2026, the day prior to the 2026 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.
[F4]The RSUs become fully vested on June 11, 2027 or the day prior to the 2027 Annual Meeting of the Stockholders of 908 Devices Inc., whichever occurs first, subject to the reporting person's continued service through the applicable vesting date, provided that, if the reporting person terminates their service for any reason, then a prorated number of RSUs will vest. The RSUs have no expiration date.
[F5]The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 11, 2026, subject to the reporting person's continued service through the applicable vesting date.

Signature

/s/ Mark S. Levine, Attorney-in-Fact|2026-06-12

2 files