SEC Form 4 · accession 0002027457-26-000003
908 Devices Inc. · MASS
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Michele M. Leonhart
Director
Period of report
Jun 10, 2026
Accepted (ET)
Jun 12, 2026 · 4:51 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001555279
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1 | Jun 10, 2026 | M | 14,083 | — | A | 20,568 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Stock UnitsF1,F2 | — | Jun 10, 2026 | M | 14,083 | D | — | — | Common Stock | 14,083 | 0 | D |
| Restricted Stock UnitsF1,F3 | — | Jun 11, 2026 | A | 13,656 | A | — | — | Common Stock | 13,656 | 13,656 | D |
| Stock Option (option to buy)F4 | $8.22 | Jun 11, 2026 | A | 6,209 | A | — | Jun 10, 2036 | Common Stock | 6,209 | 6,209 | D |
Explanation of responses
- F1Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
- F2The 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.
- F3The 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.
- F4The 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.