908 Devices Inc. (MASS) Insider Trading
Directors, officers and holders of more than 10% of MASS report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 231 transactions on file: 0 with code P, 32 with code S and 18 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 7, 2026 | Brown Christopher D. | Director | M Exercise | 60,000 | $1.75 | $105,000 |
| Oct 7, 2026 | Brown Christopher D. | Director | M Exercise | 60,000 | Not measured | Not measured |
| Oct 7, 2026 | Brown Christopher D. | Director | S Sale | 30,000 | $11.89 | $356,700 |
| Oct 6, 2026 | Griffith Joseph H. IV | Chief Financial Officer | S Sale | 5,000 | $13.03 | $65,150 |
| Sep 29, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 18,000 | $11.52 | $207,322 |
| Sep 24, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 24,000 | $11.36 | $272,626 |
| Sep 23, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 1,000 | $11.25 | $11,250 |
| Sep 17, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M Exercise | 5,257 | Not measured | Not measured |
| Sep 17, 2026 | Kenneweg John | SVP, Sales & Product Marketing | S Sale | 5,257 | $10.22 | $53,727 |
| Sep 17, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M Exercise | 5,257 | $0.9600 | $5,047 |
| Sep 16, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M Exercise | 21,399 | $0.9600 | $20,543 |
| Sep 16, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M Exercise | 21,399 | Not measured | Not measured |
| Sep 16, 2026 | Kenneweg John | SVP, Sales & Product Marketing | S Sale | 21,399 | $10.11 | $216,344 |
| Sep 15, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M Exercise | 1,000 | $0.9600 | $960 |
| Sep 15, 2026 | Kenneweg John | SVP, Sales & Product Marketing | M Exercise | 1,000 | Not measured | Not measured |
| Sep 15, 2026 | Kenneweg John | SVP, Sales & Product Marketing | S Sale | 1,000 | $10.00 | $10,000 |
| Sep 2, 2026 | Brown Christopher D. | Director | S Sale | 30,000 | $10.58 | $317,400 |
| Aug 25, 2026 | Griffith Joseph H. IV | Chief Financial Officer | S Sale | 11,459 | $10.95 | $125,476 |
| Aug 21, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 41,578 | $10.61 | $441,159 |
| Aug 20, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 8,422 | $10.52 | $88,638 |
| Aug 17, 2026 | Knopp Kevin J. | President and CEO | S Sale | 20,000 | $10.35 | $207,000 |
| Aug 13, 2026 | Knopp Kevin J. | President and CEO | S Sale | 7,622 | $10.06 | $76,677 |
| Aug 12, 2026 | Knopp Kevin J. | President and CEO | S Sale | 2,747 | $10.07 | $27,662 |
| Aug 11, 2026 | Brown Christopher D. | Director | S Sale | 8,358 | $9.23 | $77,144 |
| Aug 11, 2026 | Knopp Kevin J. | President and CEO | S Sale | 30,170 | $10.16 | $306,527 |
| Aug 11, 2026 | Knopp Kevin J. | President and CEO | S Sale | 115,748 | $9.83 | $1,137,803 |
| Aug 10, 2026 | Brown Christopher D. | Director | S Sale | 9,442 | $9.03 | $85,261 |
| Aug 10, 2026 | Knopp Kevin J. | President and CEO | S Sale | 348 | $9.06 | $3,153 |
| Aug 5, 2026 | Brown Christopher D. | Director | S Sale | 20,000 | $8.49 | $169,800 |
| Aug 4, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 50,000 | $8.36 | $417,765 |
| Aug 1, 2026 | Vann Brandi C | Director | M Exercise | 5,192 | Not measured | Not measured |
| Aug 1, 2026 | Vann Brandi C | Director | M Exercise | 5,192 | Not measured | Not measured |
| Jul 2, 2026 | Brown Christopher D. | Director | S Sale | 2,200 | $9.02 | $19,844 |
| Jul 2, 2026 | Knopp Kevin J. | President and CEO | S Sale | 222 | $9.07 | $2,014 |
| Jun 30, 2026 | Brown Christopher D. | Director | S Sale | 20,000 | $8.84 | $176,800 |
| Jun 26, 2026 | Knopp Kevin J. | President and CEO | S Sale | 2,798 | $9.09 | $25,434 |
| Jun 25, 2026 | Leonhart Michele M. | Director | M Exercise | 6,486 | Not measured | Not measured |
| Jun 25, 2026 | Knopp Kevin J. | President and CEO | S Sale | 16,388 | $9.10 | $149,131 |
| Jun 25, 2026 | Leonhart Michele M. | Director | M Exercise | 6,486 | Not measured | Not measured |
| Jun 24, 2026 | Knopp Kevin J. | President and CEO | S Sale | 40,535 | $9.14 | $370,490 |
| Jun 23, 2026 | Brown Christopher D. | Director | S Sale | 9,900 | $9.04 | $89,496 |
| Jun 23, 2026 | Knopp Kevin J. | President and CEO | S Sale | 3,422 | $9.06 | $31,003 |
| Jun 23, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 3,050 | $9.00 | $27,463 |
| Jun 22, 2026 | AWM Investment Company, Inc. | 10% Owner | S Sale | 4,668 | $8.99 | $41,965 |
| Jun 11, 2026 | Leonhart Michele M. | Director | A Award | 13,656 | Not measured | Not measured |
| Jun 11, 2026 | Leonhart Michele M. | Director | A Award | 6,209 | Not measured | Not measured |
| Jun 11, 2026 | HRUSOVSKY E KEVIN | Director | A Award | 13,656 | Not measured | Not measured |
| Jun 11, 2026 | ELOI FENEL M | Director | A Award | 6,209 | Not measured | Not measured |
| Jun 11, 2026 | HRUSOVSKY E KEVIN | Director | A Award | 6,209 | Not measured | Not measured |
| Jun 11, 2026 | Vann Brandi C | Director | A Award | 13,656 | Not measured | Not measured |
The full Form 4 history is on the MASS company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.