MASS: 908 Devices Inc. insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 5 sales totaling $913K in the last 180 days.
Insider sales
| Trade date | Insider | Role | Value | 10b5-1 plan |
|---|---|---|---|---|
| 2026-10-07 | Brown Christopher D. | Director | $357K | yes |
| 2026-10-06 | Griffith Joseph H. Iv | CFO | $65K | yes |
| 2026-09-29 | Awm Investment Company, Inc. | 10% Owner | $207K | |
| 2026-09-24 | Awm Investment Company, Inc. | 10% Owner | $273K | |
| 2026-09-23 | Awm Investment Company, Inc. | 10% Owner | $11K |
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-14 | 13G amendment | ARCH Venture Fund VII, L.P. | 14.10% | SEC | |
| 2026-08-14 | 13G amendment | ARK Investment Management LLC | 5.32% | SEC | |
| 2026-08-14 | 13G amendment | AWM Investment Company, Inc. | 11.80% | SEC | |
| 2026-07-27 | New 13G stake | BlackRock, Inc. | 5.10% | SEC |
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