Form 4 for MASS 908 Devices Inc.
Accepted 2026-04-10 19:31:27 ET · period of report 2026-04-08 · accession 0002115341-26-000010 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DMT | 2026-04-10 19:31 | 2026-04-08+ | MASS | McCallion Kevin J. | SVP, Products, Production | M - OptEx | $1.05 | +24.0K | 50.3K | +91% | +$25.2K |
| DMT | 2026-04-10 19:31 | 2026-04-08+ | MASS | McCallion Kevin J. | SVP, Products, Production | S - Sale+OE | $7.05 | -24.0K | 44.9K | -35% | -$169.1K |
| DMT | 2026-04-10 19:31 | 2026-04-08+ | MASS | McCallion Kevin J. | SVP, Products, Production | M - OptEx | $0.00 | -24.0K | 2,686 | -90% | $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 | 2026-04-08 | M | A | 18,580 | $1.05 | 63,505 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025. |
| 2 | Common | Common Stock | 2026-04-08 | S | D | 18,580 | $7.05 | 44,925 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025. (F2) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.00 to $7.25 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3). |
| 3 | Common | Common Stock | 2026-04-09 | M | A | 5,420 | $1.05 | 50,345 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025. |
| 4 | Common | Common Stock | 2026-04-09 | S | D | 5,420 | $7.03 | 44,925 | D | — | — | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025. (F3) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.00 to $7.09 inclusive. |
| 5 | Derivative | Stock Option (right to buy) | 2026-04-08 | M | D | 18,580 | $0.00 | 8,106 | D | $1.05 · — to 2030-08-27 | 18,580 Common Stock | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025. (F4) The shares underlying the option are fully vested and immediately exercisable. |
| 6 | Derivative | Stock Option (right to buy) | 2026-04-09 | M | D | 5,420 | $0.00 | 2,686 | D | $1.05 · — to 2030-08-27 | 5,420 Common Stock | (F1) This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025. (F4) The shares underlying the option are fully vested and immediately exercisable. |