MASSHealthcareSmall-Cap
908 Devices Inc. Insider Trading Activity
Every SEC Form 4 insider transaction reported for 908 Devices Inc. (MASS), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Quick Answer
Are MASS insiders buying or selling?
908 Devices Inc. insiders reported 17 open-market buys ($16.0M) and 102 sells ($34.1M) across 119 Form 4 filings — a net selling position of $18.1M.
Source: SEC EDGAR Form 4
Key Statistics (as of Jul 7, 2026)
Total Form 4 filings
119
SEC EDGAR
Insider filers
15
Insider buys (17)
$16.0M
Insider sells (102)
$34.1M
Insider sentiment
Net sellingNet insider flow of $18.1M in net selling.
Recent MASS insider transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jul 7, 2026 | Kevin J. Knopp | President and CEO | Sale | 222 | $9.07 | $2.0K |
| Jul 7, 2026 | Christopher D. Brown | Director | Sale | 2.2K | $9.02 | $19.8K |
| Jul 2, 2026 | Christopher D. Brown | Director | Sale | 20.0K | $8.84 | $176.8K |
| Jun 30, 2026 | Kevin J. Knopp | President and CEO | Sale | 2.8K | $9.09 | $25.4K |
| Jun 25, 2026 | Christopher D. Brown | Director | Sale | 9.9K | $9.04 | $89.5K |
| Jun 25, 2026 | Kevin J. Knopp | President and CEO | Sale | 60.3K | $9.12 | $550.6K |
| Jun 24, 2026 | AWM Investment Company, Inc. | 10% Owner | Sale | 7.7K | $9.00 | $69.4K |
| Jun 5, 2026 | Christopher D. Brown | Director | Sale | 100 | $9.00 | $900 |
| Jun 4, 2026 | AWM Investment Company, Inc. | 10% Owner | Sale | 42.3K | $8.97 | $379.2K |
| Jun 4, 2026 | Christopher D. Brown | Director | Sale | 20.0K | $8.73 | $174.6K |
| May 29, 2026 | AWM Investment Company, Inc. | 10% Owner | Sale | 186.9K | $8.62 | $1.6M |
| May 29, 2026 | Christopher D. Brown | Director | Sale | 30.0K | $9.00 | $270.0K |
| May 29, 2026 | Iv H. Griffith Joseph | Chief Financial Officer | Sale | 6.9K | $9.03 | $62.7K |
| May 13, 2026 | AWM Investment Company, Inc. | 10% Owner | Sale | 5.0K | $8.25 | $41.3K |
| May 11, 2026 | John Kenneweg | SVP, Sales & Product Marketing | Sale | 18.3K | $8.11 | $148.0K |
| May 8, 2026 | AWM Investment Company, Inc. | 10% Owner | Sale | 78.2K | $8.08 | $632.1K |
| May 7, 2026 | Christopher D. Brown | Director | Sale | 20.0K | $7.23 | $144.6K |
| May 4, 2026 | John Kenneweg | SVP, Sales & Product Marketing | Sale | 7.8K | $6.83 | $53.2K |
| Apr 14, 2026 | Kevin J. Mccallion | SVP, Products and Production | Sale | 2.7K | $7.01 | $18.9K |
| Apr 10, 2026 | Kevin J. Mccallion | SVP, Products and Production | Sale | 24.0K | $7.05 | $169.1K |
| Apr 10, 2026 | Christopher D. Brown | Director | Sale | 40.0K | $7.06 | $282.3K |
| Mar 4, 2026 | Kevin J. Mccallion | SVP, Products and Production | Sale | 7 | $7.00 | $49 |
| Feb 4, 2026 | Kevin J. Knopp | President and CEO | Sale | 34.8K | $6.18 | $214.8K |
| Feb 4, 2026 | Iv H. Griffith Joseph | Chief Financial Officer | Sale | 23.2K | $6.18 | $143.2K |
| Sep 23, 2025 | Iv H. Griffith Joseph | Chief Financial Officer | Sale | 5.0K | $7.07 | $35.3K |
Showing the 25 most recent of 119 Form 4 filings for 908 Devices Inc..
Most active MASS insiders
- Kevin J. Knopp29 filings
- Christopher D. Brown24 filings
- Iv H. Griffith Joseph17 filings
- John Kenneweg11 filings
- Michael S. Turner10 filings
Ask anything about MASS insider activity
Use Trabud's AI agent to query 908 Devices Inc.'s Form 4 history in plain English — "Show me MASS CEO purchases this year" or compare it against any other ticker.
Open the AI agentMASS insider trading FAQ
Are 908 Devices Inc. insiders buying or selling?
Across 119 SEC Form 4 filings, 908 Devices Inc. (MASS) insiders reported 17 open-market purchases totaling $16.0M and 102 sales totaling $34.1M. That is a net selling position of $18.1M.
How many insiders trade MASS stock?
15 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for 908 Devices Inc.. The most recent filing was accepted on Jul 7, 2026.
Where does Trabud get MASS insider trading data?
All MASS insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.
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