Form 4 for MASS 908 Devices Inc.
Accepted 2026-06-12 16:47:28 ET · period of report 2026-06-10 · accession 0001237190-26-000002 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-06-12 16:47 | 2026-06-10 | MASS | ELOI FENEL M | Dir | M - OptEx | — | +14.1K | 40.9K | +53% | — |
| D | 2026-06-12 16:47 | 2026-06-10 | MASS | ELOI FENEL M | Dir | M - OptEx | $0.00 | -14.1K | 0 | -100% | $0 |
| DM | 2026-06-12 16:47 | 2026-06-11 | MASS | ELOI FENEL M | Dir | A - Grant | $0.00 | +19.9K | 6,209 | New | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-06-10 | M | A | 14,083 | — | 40,897 | D | — | — | (F1) Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. |
| 2 | Derivative | Restricted Stock Units | 2026-06-10 | M | D | 14,083 | $0.00 | 0 | D | — · — to — | 14,083 Common Stock | (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 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. (F2) 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. |
| 3 | Derivative | Restricted Stock Units | 2026-06-11 | A | A | 13,656 | $0.00 | 13,656 | D | — · — to — | 13,656 Common Stock | (F1) Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. (F3) 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. (F3) 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. |
| 4 | Derivative | Stock Option (option to buy) | 2026-06-11 | A | A | 6,209 | $0.00 | 6,209 | D | $8.22 · — to 2036-06-10 | 6,209 Common Stock | (F4) 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. |