MASS · Insider Trading
908 Devices Inc. Common Stock
Every open-market purchase and sale reported by MASS officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-11-06 | Christopher D. Brown | Director | Sell | −30,000 | −$328.50K |
| 2026-10-09 | Christopher D. Brown | Director | MIXED | +30,000 | −$251.70K |
| 2026-10-08 | Joseph H. Griffith IV | Chief Financial Officer | Sell | −5,000 | −$65.15K |
| 2026-10-01 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −18,000 | −$207.32K |
| 2026-09-25 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −25,000 | −$283.88K |
| 2026-09-17 | John Kenneweg | SVP, Sales & Product Marketing | MIXED | — | −$253.52K |
| 2026-09-04 | Christopher D. Brown | Director | Sell | −30,000 | −$317.40K |
| 2026-08-27 | Joseph H. Griffith IV | Chief Financial Officer | Sell | −11,459 | −$125.48K |
| 2026-08-24 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −50,000 | −$529.80K |
| 2026-08-17 | Kevin J. Knopp | President and CEO | Sell | −27,622 | −$283.68K |
| 2026-08-12 | Christopher D. Brown | Director | Sell | −17,800 | −$162.41K |
| 2026-08-12 | Kevin J. Knopp | President and CEO | Sell | −149,013 | −$1.48M |
| 2026-08-07 | Christopher D. Brown | Director | Sell | −20,000 | −$169.80K |
| 2026-08-06 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −50,000 | −$417.76K |
| 2026-08-03 | Brandi C Vann | Director | M | +5,192 | — |
| 2026-07-07 | Christopher D. Brown | Director | Sell | −2,200 | −$19.84K |
| 2026-07-07 | Kevin J. Knopp | President and CEO | Sell | −222 | −$2.01K |
| 2026-07-02 | Christopher D. Brown | Director | Sell | −20,000 | −$176.80K |
| 2026-06-25 | Christopher D. Brown | Director | Sell | −9,900 | −$89.50K |
| 2026-06-25 | Kevin J. Knopp | President and CEO | Sell | −60,345 | −$550.62K |
| 2026-06-25 | Michele M. Leonhart | Director | M | +6,486 | — |
| 2026-06-24 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −7,718 | −$69.43K |
| 2026-06-12 | Brandi C Vann | Director | A | +19,865 deriv. | — |
| 2026-06-12 | Michele M. Leonhart | Director | M | +14,083 | — |
| 2026-06-12 | Keith Crandell | Director | M | +14,083 | — |
| 2026-06-12 | E Kevin Hrusovsky | Director | M | +14,083 | — |
| 2026-06-12 | Mark Spoto | Director | M | +14,083 | — |
| 2026-06-12 | Fenel M Eloi | Director | M | +14,083 | — |
| 2026-06-12 | Anthony Hunt | Director | M | +14,083 | — |
| 2026-06-05 | Christopher D. Brown | Director | Sell | −100 | −$900 |
| 2026-06-04 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −42,282 | −$379.23K |
| 2026-06-04 | Christopher D. Brown | Director | Sell | −20,000 | −$174.60K |
| 2026-05-29 | Christopher D. Brown | Director | Sell | −30,000 | −$270.00K |
| 2026-05-29 | Joseph H. Griffith IV | Chief Financial Officer | Sell | −6,940 | −$62.67K |
| 2026-05-29 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −186,942 | −$1.61M |
| 2026-05-13 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −5,000 | −$41.26K |
| 2026-05-11 | John Kenneweg | SVP, Sales & Product Marketing | Sell | −18,255 | −$148.05K |
| 2026-05-08 | AWM Investment Company, Inc. | 10%+ Owner | Sell | −78,209 | −$632.13K |
| 2026-05-07 | Christopher D. Brown | Director | Sell | −20,000 | −$144.60K |
| 2026-05-04 | John Kenneweg | SVP, Sales & Product Marketing | MIXED | +18,255 | −$53.19K |
| 2026-04-29 | John Kenneweg | SVP, Sales & Product Marketing | A | +26,042 deriv. | — |
| 2026-04-22 | Kolawole A. Otitoju | Chief Bus. & Strategy Officer | A | +256,982 deriv. | — |
| 2026-04-14 | Kevin J. McCallion | SVP, Products and Production | MIXED | — | −$16.05K |
| 2026-04-10 | Kevin J. McCallion | SVP, Products and Production | MIXED | — | −$143.89K |
| 2026-04-10 | Christopher D. Brown | Director | Sell | −40,000 | −$282.28K |
| 2026-03-05 | Kevin J. McCallion | SVP, Products and Production | MIXED | — | −$42 |
| 2026-03-04 | Kevin J. McCallion | SVP, Products and Production | Sell | −7 | −$49 |
| 2026-02-03 | Mark Spoto | Director | MIXED | +928 | — |
| 2026-02-03 | Christopher D. Brown | Director | M | +23,437 | — |
| 2026-02-03 | Joseph H. Griffith IV | Chief Financial Officer | MIXED | +46,966 | −$143.22K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Keith Crandell | Director | 5,764,419 | $59.95M |
| AWM Investment Company, Inc. | 10%+ Owner | 4,736,773 | $49.26M |
| Kevin J. Knopp | President and CEO | 1,097,191 | $11.41M |
| Christopher D. Brown | Director | 775,559 | $8.07M |
| E Kevin Hrusovsky | Director | 495,065 | $5.15M |
| Joseph H. Griffith IV | Chief Financial Officer | 116,497 | $1.21M |
| Mark Spoto | Director | 92,945 | $966.63K |
| John Kenneweg | SVP, Sales & Product Marketing | 63,041 | $655.63K |
| Kevin J. McCallion | SVP, Products and Production | 44,925 | $467.22K |
| Anthony Hunt | Director | 44,168 | $459.35K |
| Fenel M Eloi | Director | 40,897 | $425.33K |
| Michele M. Leonhart | Director | 27,054 | $281.36K |
| Jeffrey P. George | Director | 26,814 | $278.87K |
| Marcia Eisenberg | Director | 25,957 | $269.95K |
| Brandi C Vann | Director | 5,192 | $54.00K |
| Michael S. Turner | Chief Legal & Admin Officer | 1,373 | $14.28K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MASS quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.