MASS insider transaction filings
908 Devices Inc. — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-09-17. Screen MASS transaction legs live →
Insider transaction summary — last 90 days
2026-06-24 to 2026-09-22, from the filings listed below: 18 Form 4 filings. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 27 legs across 16 filings by 5 insiders — 486,733 shares, $4,695,176 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 10.
- Largest priced transaction: sale of 115,748 shares @ $9.83 ($1,137,803) by Knopp Kevin J., filed 2026-08-12.
By insider — same window
Open-market purchase/sale legs on non-derivative securities, grouped by the filing's reporting owner(s); joint filings appear once. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Insider | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|
| Knopp Kevin J. — President and CEO, Director | 5 | — | 11 legs · 240,000 sh · $2,336,894 | — |
| AWM Investment Company, Inc. — 10% owner | 3 | — | 5 legs · 107,718 sh · $1,016,990 | — |
| Brown Christopher D. — Director | 6 | — | 7 legs · 99,900 sh · $935,746 | — |
| Kenneweg John — SVP, Sales & Product Marketing | 1 | — | 3 legs · 27,656 sh · $280,070 | 6 |
| Griffith Joseph H. IV — Chief Financial Officer | 1 | — | 1 leg · 11,459 sh · $125,476 | — |
| Leonhart Michele M. — Director | 1 | — | — | 2 |
| Vann Brandi C — Director | 1 | — | — | 2 |
Recent Form 4 filings — 908 Devices Inc.
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-17 | 4 | Kenneweg John — SVP, Sales & Product Marketing | Option exercise (M): 1,000 @ $0.96 · Sale (S): 1,000 @ $10 · Option exercise (M): 21,399 @ $0.96 · Sale (S): 21,399 @ $10.11 · Option exercise (M): 5,257 @ $0.96 · Sale (S): 5,257 @ $10.22 · +3 more | EDGAR |
| 2026-09-04 | 4 | Brown Christopher D. — Director | Sale (S): 30,000 @ $10.58 | EDGAR |
| 2026-08-27 | 4 | Griffith Joseph H. IV — Chief Financial Officer | Sale (S): 11,459 @ $10.95 | EDGAR |
| 2026-08-24 | 4 | AWM Investment Company, Inc. — 10% owner | Sale (S): 8,422 @ $10.52 · Sale (S): 41,578 @ $10.61 | EDGAR |
| 2026-08-17 | 4 | Knopp Kevin J. — President and CEO, Director | Sale (S): 7,622 @ $10.06 · Sale (S): 20,000 @ $10.35 | EDGAR |
| 2026-08-12 | 4 | Knopp Kevin J. — President and CEO, Director | Sale (S): 348 @ $9.06 · Sale (S): 115,748 @ $9.83 · Sale (S): 30,170 @ $10.16 · Sale (S): 2,747 @ $10.07 | EDGAR |
| 2026-08-12 | 4 | Brown Christopher D. — Director | Sale (S): 9,442 @ $9.03 · Sale (S): 8,358 @ $9.23 | EDGAR |
| 2026-08-07 | 4 | Brown Christopher D. — Director | Sale (S): 20,000 @ $8.49 | EDGAR |
| 2026-08-06 | 4 | AWM Investment Company, Inc. — 10% owner | Sale (S): 50,000 @ $8.36 | EDGAR |
| 2026-08-03 | 4 | Vann Brandi C — Director | Option exercise (M): 5,192 · Option exercise (M): 5,192 (derivative) @ $0 | EDGAR |
| 2026-07-07 | 4 | Brown Christopher D. — Director | Sale (S): 2,200 @ $9.02 | EDGAR |
| 2026-07-07 | 4 | Knopp Kevin J. — President and CEO, Director | Sale (S): 222 @ $9.07 | EDGAR |
| 2026-07-02 | 4 | Brown Christopher D. — Director | Sale (S): 20,000 @ $8.84 | EDGAR |
| 2026-06-30 | 4 | Knopp Kevin J. — President and CEO, Director | Sale (S): 2,798 @ $9.09 | EDGAR |
| 2026-06-25 | 4 | Leonhart Michele M. — Director | Option exercise (M): 6,486 · Option exercise (M): 6,486 (derivative) @ $0 | EDGAR |
| 2026-06-25 | 4 | Brown Christopher D. — Director | Sale (S): 9,900 @ $9.04 | EDGAR |
| 2026-06-25 | 4 | Knopp Kevin J. — President and CEO, Director | Sale (S): 3,422 @ $9.06 · Sale (S): 40,535 @ $9.14 · Sale (S): 16,388 @ $9.10 | EDGAR |
| 2026-06-24 | 4 | AWM Investment Company, Inc. — 10% owner | Sale (S): 4,668 @ $8.99 · Sale (S): 3,050 @ $9.00 | EDGAR |
| 2026-06-12 | 4 | Vann Brandi C — Director | Grant/award (A): 13,656 (derivative) @ $0 · Grant/award (A): 6,209 (derivative) @ $0 | EDGAR |
| 2026-06-12 | 4 | Leonhart Michele M. — Director | Option exercise (M): 14,083 · Option exercise (M): 14,083 (derivative) @ $0 · Grant/award (A): 13,656 (derivative) @ $0 · Grant/award (A): 6,209 (derivative) @ $0 | EDGAR |
| 2026-06-12 | 4 | Spoto Mark — Director | Option exercise (M): 14,083 · Option exercise (M): 14,083 (derivative) @ $0 · Grant/award (A): 13,656 (derivative) @ $0 · Grant/award (A): 6,209 (derivative) @ $0 | EDGAR |
| 2026-06-12 | 4 | Hunt Anthony — Director | Option exercise (M): 14,083 · Option exercise (M): 14,083 (derivative) @ $0 · Grant/award (A): 13,656 (derivative) @ $0 · Grant/award (A): 6,209 (derivative) @ $0 | EDGAR |
| 2026-06-12 | 4 | HRUSOVSKY E KEVIN — Director | Option exercise (M): 14,083 · Option exercise (M): 14,083 (derivative) @ $0 · Grant/award (A): 13,656 (derivative) @ $0 · Grant/award (A): 6,209 (derivative) @ $0 | EDGAR |
| 2026-06-12 | 4 | ELOI FENEL M — Director | Option exercise (M): 14,083 · Option exercise (M): 14,083 (derivative) @ $0 · Grant/award (A): 13,656 (derivative) @ $0 · Grant/award (A): 6,209 (derivative) @ $0 | EDGAR |
| 2026-06-12 | 4 | CRANDELL KEITH — Director | Option exercise (M): 14,083 · Option exercise (M): 14,083 (derivative) @ $0 · Grant/award (A): 13,656 (derivative) @ $0 · Grant/award (A): 6,209 (derivative) @ $0 | EDGAR |
| 2026-06-05 | 4 | Brown Christopher D. — Director | Sale (S): 100 @ $9 | EDGAR |
| 2026-06-04 | 4 | Brown Christopher D. — Director | Sale (S): 20,000 @ $8.73 | EDGAR |
| 2026-06-04 | 4 | AWM Investment Company, Inc. — 10% owner | Sale (S): 2,500 @ $8.95 · Sale (S): 39,782 @ $8.97 | EDGAR |
| 2026-05-29 | 4 | Brown Christopher D. — Director | Sale (S): 30,000 @ $9 | EDGAR |
| 2026-05-29 | 4 | AWM Investment Company, Inc. — 10% owner | Sale (S): 1,500 @ $8.25 · Sale (S): 15,000 @ $8.25 · Sale (S): 170,442 @ $8.66 | EDGAR |
| 2026-05-29 | 4 | Griffith Joseph H. IV — Chief Financial Officer | Sale (S): 6,940 @ $9.03 | EDGAR |
| 2026-05-13 | 4 | AWM Investment Company, Inc. — 10% owner | Sale (S): 5,000 @ $8.25 | EDGAR |
| 2026-05-11 | 4 | Kenneweg John — SVP, Sales & Product Marketing | Sale (S): 18,255 @ $8.11 | EDGAR |
| 2026-05-08 | 4 | AWM Investment Company, Inc. — 10% owner | Sale (S): 5,000 @ $8 · Sale (S): 57,365 @ $8.06 · Sale (S): 12,819 @ $8.20 · Sale (S): 3,025 @ $8.20 | EDGAR |
| 2026-05-07 | 4 | Brown Christopher D. — Director | Sale (S): 20,000 @ $7.23 | EDGAR |
| 2026-05-04 | 4 | Kenneweg John — SVP, Sales & Product Marketing | Option exercise (M): 26,042 · Sale (S): 7,787 @ $6.83 · Option exercise (M): 26,042 (derivative) @ $0 | EDGAR |
| 2026-04-29 | 4 | Kenneweg John — SVP, Sales & Product Marketing | Grant/award (A): 26,042 (derivative) @ $0 | EDGAR |
| 2026-04-22 | 4 | Otitoju Kolawole A. — Chief Bus. & Strategy Officer | Grant/award (A): 146,789 (derivative) @ $0 · Grant/award (A): 110,193 (derivative) @ $0 | EDGAR |
| 2026-04-14 | 4 | McCallion Kevin J. — SVP, Products and Production | Option exercise (M): 2,693 @ $1.05 · Sale (S): 2,693 @ $7.01 · Option exercise (M): 2,693 (derivative) @ $0 | EDGAR |
| 2026-04-10 | 4 | McCallion Kevin J. — SVP, Products and Production | Option exercise (M): 18,580 @ $1.05 · Sale (S): 18,580 @ $7.05 · Option exercise (M): 5,420 @ $1.05 · Sale (S): 5,420 @ $7.03 · Option exercise (M): 18,580 (derivative) @ $0 · Option exercise (M): 5,420 (derivative) @ $0 | EDGAR |
| 2026-04-10 | 4 | Brown Christopher D. — Director | Sale (S): 15,030 @ $7.05 · Sale (S): 7,392 @ $7.04 · Sale (S): 17,578 @ $7.07 | EDGAR |
| 2026-03-05 | 4/A | McCallion Kevin J. — SVP, Products and Production | Option exercise (M): 7 @ $1.05 · Sale (S): 7 @ $7 · Option exercise (M): 7 (derivative) @ $0 | EDGAR |
| 2026-03-04 | 4 | McCallion Kevin J. — SVP, Products and Production | Sale (S): 7 @ $7 | EDGAR |
| 2026-02-03 | 4 | Brown Christopher D. — Director | Option exercise (M): 5,027 · Option exercise (M): 7,418 · Option exercise (M): 10,992 · Option exercise (M): 5,027 (derivative) @ $0 · Option exercise (M): 7,418 (derivative) @ $0 · Option exercise (M): 10,992 (derivative) @ $0 | EDGAR |
| 2026-02-03 | 4 | Spoto Mark — Director | Code (W): 928 @ $0 · Gift (G): 928 @ $0 · Gift (G): 928 @ $0 | EDGAR |
| 2026-02-03 | 4 | Knopp Kevin J. — President and CEO, Director | Option exercise (M): 11,255 · Option exercise (M): 13,449 · Option exercise (M): 17,007 · Option exercise (M): 66,288 · Sale (S): 34,764 @ $6.18 · Option exercise (M): 11,255 (derivative) @ $0 · +5 more | EDGAR |
| 2026-02-03 | 4 | Griffith Joseph H. IV — Chief Financial Officer | Option exercise (M): 5,102 · Option exercise (M): 10,306 · Option exercise (M): 11,260 · Option exercise (M): 43,473 · Sale (S): 23,175 @ $6.18 · Option exercise (M): 5,102 (derivative) @ $0 · +5 more | EDGAR |
| 2025-10-06 | 4 | Griffith Joseph H. IV — Chief Financial Officer | Sale (S): 708 @ $9.04 · Sale (S): 4,292 @ $9.05 | EDGAR |
| 2025-09-23 | 4 | Griffith Joseph H. IV — Chief Financial Officer | Sale (S): 5,000 @ $7.07 | EDGAR |
| 2025-08-18 | 4 | Vann Brandi C — Director | Grant/award (A): 15,577 (derivative) @ $0 · Grant/award (A): 20,409 (derivative) @ $0 | EDGAR |
Recent 8-K events — 908 Devices Inc.
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-08-11 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-07-08 | 8-K | 8.01 — Other Events | EDGAR |
| 2026-06-12 | 8-K | 5.07 — Submission of Matters to a Vote of Security Holders | EDGAR |
| 2026-05-06 | 8-K | 1.01 — Entry into a Material Definitive Agreement 2.01 — Completion of Acquisition or Disposition of Assets 2.02 — Results of Operations and Financial Condition 3.02 — Unregistered Sales of Equity Securities 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-03-03 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-01-20 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-11-10 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-08-05 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-08-04 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-06-16 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
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