MASS (908 Devices Inc. Common Stock)
Insider Trading Activity
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.
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-07 | Christopher D. Brown | Director | Sell | — | — |
| 2026-08-06 | AWM Investment Company, Inc. | 10%+ Owner | Sell | — | — |
| 2026-08-03 | Brandi C Vann | Director | M | — | — |
| 2026-07-07 | Christopher D. Brown | Director | Sell | — | — |
| 2026-07-07 | Kevin J. Knopp | President and CEO | Sell | — | — |
| 2026-07-02 | Christopher D. Brown | Director | Sell | — | — |
| 2026-06-25 | Christopher D. Brown | Director | Sell | — | — |
| 2026-06-25 | Kevin J. Knopp | President and CEO | Sell | — | — |
| 2026-06-25 | Michele M. Leonhart | Director | M | — | — |
| 2026-06-24 | AWM Investment Company, Inc. | 10%+ Owner | Sell | — | — |
| 2026-06-12 | Brandi C Vann | Director | A | — | — |
| 2026-06-12 | Michele M. Leonhart | Director | M | — | — |
| 2026-06-12 | KEITH CRANDELL | Director | M | — | — |
| 2026-06-12 | E KEVIN HRUSOVSKY | Director | M | — | — |
| 2026-06-12 | Mark Spoto | Director | M | — | — |
| 2026-06-12 | FENEL M ELOI | Director | M | — | — |
| 2026-06-12 | Anthony Hunt | Director | M | — | — |
| 2026-06-05 | Christopher D. Brown | Director | Sell | — | — |
| 2026-06-04 | AWM Investment Company, Inc. | 10%+ Owner | Sell | — | — |
| 2026-06-04 | Christopher D. Brown | Director | Sell | — | — |
| 2026-05-29 | Christopher D. Brown | Director | Sell | — | — |
| 2026-05-29 | Joseph H. IV Griffith | Chief Financial Officer | Sell | — | — |
| 2026-05-29 | AWM Investment Company, Inc. | 10%+ Owner | Sell | — | — |
| 2026-05-13 | AWM Investment Company, Inc. | 10%+ Owner | Sell | — | — |
| 2026-05-11 | John Kenneweg | SVP, Sales & Product Marketing | Sell | — | — |
| 2026-05-08 | AWM Investment Company, Inc. | 10%+ Owner | Sell | — | — |
| 2026-05-07 | Christopher D. Brown | Director | Sell | — | — |
| 2026-05-04 | John Kenneweg | SVP, Sales & Product Marketing | MIXED | — | — |
| 2026-04-29 | John Kenneweg | SVP, Sales & Product Marketing | A | — | — |
| 2026-04-22 | Kolawole A. Otitoju | Chief Bus. & Strategy Officer | A | — | — |
| 2026-04-14 | Kevin J. McCallion | SVP, Products and Production | MIXED | — | — |
| 2026-04-10 | Kevin J. McCallion | SVP, Products and Production | MIXED | — | — |
| 2026-04-10 | Christopher D. Brown | Director | Sell | — | — |
| 2026-03-05 | Kevin J. McCallion | SVP, Products and Production | MIXED | — | — |
| 2026-03-04 | Kevin J. McCallion | SVP, Products and Production | Sell | — | — |
| 2026-02-03 | Mark Spoto | Director | MIXED | — | — |
| 2026-02-03 | Christopher D. Brown | Director | M | — | — |
| 2026-02-03 | Joseph H. IV Griffith | Chief Financial Officer | MIXED | — | — |
| 2026-02-03 | Kevin J. Knopp | President and CEO | MIXED | — | — |
| 2025-10-06 | Joseph H. IV Griffith | Chief Financial Officer | Sell | — | — |
| 2025-09-23 | Joseph H. IV Griffith | Chief Financial Officer | Sell | — | — |
| 2025-08-18 | Brandi C Vann | Director | A | — | — |
| 2025-06-27 | Michele M. Leonhart | Director | M | — | — |
| 2025-06-18 | Michael S. Turner | Chief Legal & Admin Officer | Sell | — | — |
| 2025-06-13 | KEITH CRANDELL | Director | M | — | — |
| 2025-06-13 | Marcia Eisenberg | Director | M | — | — |
| 2025-06-13 | Jeffrey P. George | Director | M | — | — |
| 2025-06-13 | Anthony Hunt | Director | M | — | — |
| 2025-06-13 | Mark Spoto | Director | M | — | — |
| 2025-06-13 | FENEL M ELOI | Director | M | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Director | 5,764,419 | — |
| — | 10%+ Owner | 5,725,045 | — |
| — | 10%+ Owner | 4,829,773 | — |
| — | President and CEO | 1,273,826 | — |
| — | Director | 1,077,091 | — |
| — | Director | 823,359 | — |
| — | Director | 495,065 | — |
| — | Chief Financial Officer | 132,956 | — |
| — | Director | 92,945 | — |
| — | VP, Corporate Development | 80,000 | — |
| — | SVP, Sales & Product Marketing | 57,784 | — |
| — | SVP, Products and Production | 44,925 | — |
| — | Director | 44,168 | — |
| — | Director | 40,897 | — |
| — | VP, Corporate Development | 28,920 | — |
| — | Director | 27,054 | — |
| — | Director | 26,814 | — |
| — | Director | 25,957 | — |
| — | Director | 5,192 | — |
| — | VP, Product Management & Mktg | 2,834 | — |
| — | Chief Legal & Admin Officer | 1,373 | — |
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.