As of the latest Form 4 filed Jul 7, 2026.
What 908 Devices Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 45 most recent filings for MASS.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-07-07 | 2026-07-02 | Brown Christopher D. Director | SSale | −2.20K | $9.02 | $19.8K | Yes (planned) | Form 4 ↗ |
| 2026-07-07 | 2026-07-02 | Knopp Kevin J. President and CEO | SSale | −222.00 | $9.07 | $2.01K | Yes (planned) | Form 4 ↗ |
| 2026-07-02 | 2026-06-30 | Brown Christopher D. Director | SSale | −20.0K | $8.84 | $177K | Yes (planned) | Form 4 ↗ |
| 2026-06-30 | 2026-06-26 | Knopp Kevin J. President and CEO | SSale | −2.80K | $9.09 | $25.4K | Yes (planned) | Form 4 ↗ |
| 2026-06-25 | 2026-06-25 | Leonhart Michele M. Director | MExercise | +6.49K | — | — | No | Form 4 ↗ |
| 2026-06-25 | 2026-06-25 | Knopp Kevin J. President and CEO | SSale | −16.4K | $9.10 | $149K | Yes (planned) | Form 4 ↗ |
| 2026-06-25 | 2026-06-24 | Knopp Kevin J., President and CEO | SSale | −40.5K | $9.14 | $370K | Yes (planned) | Form 4 ↗ |
| 2026-06-25 | 2026-06-23 | Brown Christopher D. Director | SSale | −9.90K | $9.04 | $89.5K | Yes (planned) | Form 4 ↗ |
| 2026-06-25 | 2026-06-23 | Knopp Kevin J. President and CEO | SSale | −3.42K | $9.06 | $31.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-24 | 2026-06-23 | AWM Investment Company, Inc. 10% owner | SSale | −3.05K | $9.00 | $27.5K | No | Form 4 ↗ |
| 2026-06-24 | 2026-06-22 | AWM Investment Company, Inc., 10% owner | SSale | −4.67K | $8.99 | $42.0K | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Leonhart Michele M. Director | MExercise | +14.1K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Spoto Mark Director | MExercise | +14.1K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | Hunt Anthony Director | MExercise | +14.1K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | HRUSOVSKY E KEVIN Director | MExercise | +14.1K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | ELOI FENEL M Director | MExercise | +14.1K | — | — | No | Form 4 ↗ |
| 2026-06-12 | 2026-06-10 | CRANDELL KEITH Director | MExercise | +14.1K | — | — | No | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Brown Christopher D. Director | SSale | −100.00 | $9.00 | $900.00 | Yes (planned) | Form 4 ↗ |
| 2026-06-04 | 2026-06-04 | AWM Investment Company, Inc. 10% owner | SSale | −39.8K | $8.97 | $357K | No | Form 4 ↗ |
| 2026-06-04 | 2026-06-03 | Brown Christopher D. Director | SSale | −20.0K | $8.73 | $175K | Yes (planned) | Form 4 ↗ |
| 2026-06-04 | 2026-06-02 | AWM Investment Company, Inc. 10% owner | SSale | −2.50K | $8.95 | $22.4K | No | Form 4 ↗ |
| 2026-05-29 | 2026-05-28 | Brown Christopher D. Director | SSale | −30.0K | $9.00 | $270K | Yes (planned) | Form 4 ↗ |
| 2026-05-29 | 2026-05-28 | AWM Investment Company, Inc. 10% owner | SSale | −170K | $8.66 | $1.48M | No | Form 4 ↗ |
| 2026-05-29 | 2026-05-28 | Griffith Joseph H. IV Chief Financial Officer | SSale | −6.94K | $9.03 | $62.7K | Yes (planned) | Form 4 ↗ |
| 2026-05-29 | 2026-05-27 | AWM Investment Company, Inc. 10% owner | SSale | −15.0K | $8.25 | $124K | No | Form 4 ↗ |
| 2026-05-29 | 2026-05-27 | AWM Investment Company, Inc., 10% owner | SSale | −1.50K | $8.25 | $12.4K | No | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | AWM Investment Company, Inc. 10% owner | SSale | −5.00K | $8.25 | $41.3K | No | Form 4 ↗ |
| 2026-05-11 | 2026-05-08 | Kenneweg John SVP, Sales & Product Marketing | SSale | −18.3K | $8.11 | $148K | No | Form 4 ↗ |
| 2026-05-08 | 2026-05-08 | AWM Investment Company, Inc. 10% owner | SSale | −3.02K | $8.20 | $24.8K | No | Form 4 ↗ |
| 2026-05-08 | 2026-05-07 | AWM Investment Company, Inc., 10% owner | SSale | −12.8K | $8.20 | $105K | No | Form 4 ↗ |
| 2026-05-08 | 2026-05-06 | AWM Investment Company, Inc., 10% owner | SSale | −57.4K | $8.06 | $462K | No | Form 4 ↗ |
| 2026-05-08 | 2026-05-06 | AWM Investment Company, Inc., 10% owner | SSale | −5.00K | $8.00 | $40.0K | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-06 | Brown Christopher D. Director | SSale | −20.0K | $7.23 | $145K | Yes (planned) | Form 4 ↗ |
| 2026-05-04 | 2026-05-01 | Kenneweg John SVP, Sales & Product Marketing | SSale | −7.79K | $6.83 | $53.2K | No | Form 4 ↗ |
| 2026-05-04 | 2026-05-01 | Kenneweg John, SVP, Sales & Product Marketing | MExercise | +26.0K | — | — | No | Form 4 ↗ |
| 2026-04-14 | 2026-04-10 | McCallion Kevin J. SVP, Products and Production | SSale | −2.69K | $7.01 | $18.9K | Yes (planned) | Form 4 ↗ |
| 2026-04-14 | 2026-04-10 | McCallion Kevin J., SVP, Products and Production | MExercise | +2.69K | $1.05 | $2.83K | Yes (planned) | Form 4 ↗ |
| 2026-04-10 | 2026-04-10 | Brown Christopher D. Director | SSale | −17.6K | $7.07 | $124K | Yes (planned) | Form 4 ↗ |
| 2026-04-10 | 2026-04-09 | McCallion Kevin J. SVP, Products and Production | SSale | −5.42K | $7.03 | $38.1K | Yes (planned) | Form 4 ↗ |
| 2026-04-10 | 2026-04-09 | McCallion Kevin J., SVP, Products and Production | MExercise | +5.42K | $1.05 | $5.69K | Yes (planned) | Form 4 ↗ |
| 2026-04-10 | 2026-04-09 | Brown Christopher D. Director | SSale | −7.39K | $7.04 | $52.0K | Yes (planned) | Form 4 ↗ |
| 2026-04-10 | 2026-04-08 | McCallion Kevin J. SVP, Products and Production | SSale | −18.6K | $7.05 | $131K | Yes (planned) | Form 4 ↗ |
| 2026-04-10 | 2026-04-08 | McCallion Kevin J., SVP, Products and Production | MExercise | +18.6K | $1.05 | $19.5K | Yes (planned) | Form 4 ↗ |
| 2026-04-10 | 2026-04-08 | Brown Christopher D. Director | SSale | −15.0K | $7.05 | $106K | Yes (planned) | Form 4 ↗ |
| 2026-03-04 | 2026-03-02 | McCallion Kevin J. SVP, Products and Production | SSale | −7.00 | $7.00 | $49.00 | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MASS’s full analysis or the market-wide insider trading feed. The tabs above jump to MASS’s other SEC data.
Source: SEC Form 4 filings for MASS, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.