Form 4 for MASS 908 Devices Inc.
Accepted 2026-06-25 16:15:08 ET · period of report 2026-06-25 · accession 0002027457-26-000005 · 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 | 2026-06-25 16:15 | 2026-06-25 | MASS | Leonhart Michele M. | Dir | M - OptEx | — | +6,486 | 27.1K | +32% | — |
| D | 2026-06-25 16:15 | 2026-06-25 | MASS | Leonhart Michele M. | Dir | M - OptEx | $0.00 | -6,486 | 6,485 | -50% | $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 | 2026-06-25 | M | A | 6,486 | — | 27,054 | 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 | 2026-06-25 | M | D | 6,486 | $0.00 | 6,485 | D | — · — to — | 6,486 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 become vested in substantially equal annual installments over the 3 years following June 25, 2024, 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. (F2) The RSUs become vested in substantially equal annual installments over the 3 years following June 25, 2024, 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. |