Form4.ai tracks every SEC insider trade in real time. See every MASS insider filing with a free account — no card.
See every MASS insider filing — free account, no card.
Free account908 Devices Inc. (MASS) has 13 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 11 sales totalling $4.0M. Most recent filing: Oct. 9, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Oct 9, 2026 SEC filing | Brown Christopher D. Director | Vest & sell-to-cover | +30,000 sh | — |
| Oct 8, 2026 SEC filing | Griffith Joseph H. IV Chief Financial Officer | Sold | $65,150 | — |
| Oct 1, 2026 SEC filing | AWM Investment Company, Inc. 10% Owner | Sold | $207,322 | — |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.