MASS insider trading — 908 Devices Inc.
Over the last 90 days, insiders at 908 Devices Inc. (MASS) made 0 open-market purchases worth $0 and 6 open-market sales worth $1.44M, making them net sellers by $1.44M. The largest sale was by Awm Investment Company, Inc. (10% Owner), who sold 41,578 shares for $441K on Aug 21, 2026.
Updated Oct 16, 2026.
Recent MASS insider transactions
Every Form 4 filed by 908 Devices Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Oct 7, 2026 | Brown Christopher D. | Director | S · Sale · 10b5-1 | Direct | 30,000 | $11.89 | $357K | Form 4 |
| Oct 7, 2026 | Brown Christopher D. | Director | M · Option exercise · 10b5-1 | Direct | 60,000 | $1.75 | $105K | Form 4 |
| Oct 6, 2026 | Griffith Joseph H. Iv | Chief Financial Officer | S · Sale · 10b5-1 | Direct | 5,000 | $13.03 | $65K | Form 4 |
| Sep 29, 2026 | Awm Investment Company, Inc. | 10% Owner | S · Sale | Indirect | 18,000 | $11.52 | $207K | Form 4 |
| Sep 24, 2026 | Awm Investment Company, Inc. | 10% Owner | S · Sale | Indirect | 24,000 | $11.36 | $273K | Form 4 |
| Sep 23, 2026 | Awm Investment Company, Inc. | 10% Owner | S · Sale | Indirect | 1,000 | $11.25 | $11K | Form 4 |
| Sep 17, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M · Option exercise · 10b5-1 | Direct | 5,257 | $0.96 | $5K | Form 4 |
| Sep 17, 2026 | Kenneweg John | SVP, Sales & Product Marketing | S · Sale · 10b5-1 | Direct | 5,257 | $10.22 | $54K | Form 4 |
| Sep 16, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M · Option exercise · 10b5-1 | Direct | 21,399 | $0.96 | $21K | Form 4 |
| Sep 16, 2026 | Kenneweg John | SVP, Sales & Product Marketing | S · Sale · 10b5-1 | Direct | 21,399 | $10.11 | $216K | Form 4 |
| Sep 15, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M · Option exercise · 10b5-1 | Direct | 1,000 | $0.96 | $960 | Form 4 |
| Sep 15, 2026 | Kenneweg John | SVP, Sales & Product Marketing | S · Sale · 10b5-1 | Direct | 1,000 | $10.00 | $10K | Form 4 |
| Sep 2, 2026 | Brown Christopher D. | Director | S · Sale · 10b5-1 | Direct | 30,000 | $10.58 | $317K | Form 4 |
| Aug 25, 2026 | Griffith Joseph H. Iv | Chief Financial Officer | S · Sale · 10b5-1 | Direct | 11,459 | $10.95 | $125K | Form 4 |
| Aug 21, 2026 | Awm Investment Company, Inc. | 10% Owner | S · Sale | Indirect | 41,578 | $10.61 | $441K | Form 4 |
| Aug 20, 2026 | Awm Investment Company, Inc. | 10% Owner | S · Sale | Indirect | 8,422 | $10.52 | $89K | Form 4 |
| Aug 17, 2026 | Knopp Kevin J. | President and CEO | S · Sale · 10b5-1 | Direct | 20,000 | $10.35 | $207K | Form 4 |
| Aug 13, 2026 | Knopp Kevin J. | President and CEO | S · Sale · 10b5-1 | Direct | 7,622 | $10.06 | $77K | Form 4 |
| Aug 12, 2026 | Knopp Kevin J. | President and CEO | S · Sale · 10b5-1 | Direct | 2,747 | $10.07 | $28K | Form 4 |
| Aug 11, 2026 | Brown Christopher D. | Director | S · Sale · 10b5-1 | Direct | 8,358 | $9.23 | $77K | Form 4 |
| Aug 11, 2026 | Knopp Kevin J. | President and CEO | S · Sale · 10b5-1 | Direct | 145,918 | $9.90 | $1.44M | Form 4 |
| Aug 10, 2026 | Brown Christopher D. | Director | S · Sale · 10b5-1 | Direct | 9,442 | $9.03 | $85K | Form 4 |
| Aug 10, 2026 | Knopp Kevin J. | President and CEO | S · Sale · 10b5-1 | Direct | 348 | $9.06 | $3K | Form 4 |
| Aug 5, 2026 | Brown Christopher D. | Director | S · Sale · 10b5-1 | Direct | 20,000 | $8.49 | $170K | Form 4 |
| Aug 4, 2026 | Awm Investment Company, Inc. | 10% Owner | S · Sale | Indirect | 50,000 | $8.36 | $418K | Form 4 |
| Aug 1, 2026 | Vann Brandi C | Director | M · Option exercise | Direct | 5,192 | — | — | Form 4 |
MASS insider trading FAQ
Are insiders buying MASS stock?
Not on the open market. In the last 90 days, 908 Devices Inc. insiders made no open-market purchases, and 6 open-market sales totaling $1.44M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading MASS?
Recent sellers: Awm Investment Company, Inc..
Where does MASS insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.