$MASS insider trading
Over the last 12 months, 908 Devices insiders reported no purchases and 35 sales totaling $9.5M across SEC Form 4 filings. 66% of those filings were made under pre-arranged 10b5-1 trading plans.
- Bought · 12m
- — 0 events
- Sold · 12m
- $9.5M 35 events
- Events · 12m
- 35 Form 4 filings, grouped
- Insiders · 12m
- 6 distinct reporters
- 10b5-1 share
- 66% of events, not dollars
All insider trades
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Sep 29, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 18,000 | $11.52 | $207K | -0.4% | indirect |
| Sep 24, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 25,000 | $11.36 | $284K | -0.5% | 2 tranches · indirect |
| Sep 17, 2026 | Kenneweg JohnSVP, Sales & Product Marketing · O | ▼ Sale | 27,656 | $10.13 | $280K | -32.4% | plan · 3 tranches |
| Sep 2, 2026 | Brown Christopher D.D | ▼ Sale | 30,000 | $10.58 | $317K | -3.7% | plan |
| Aug 25, 2026 | Griffith Joseph H. IVChief Financial Officer · O | ▼ Sale | 11,459 | $10.95 | $125K | -8.6% | plan |
| Aug 21, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 50,000 | $10.6 | $530K | -1% | 2 tranches · indirect |
| Aug 17, 2026 | Knopp Kevin J.President and CEO · O·D | ▼ Sale | 27,622 | $10.27 | $284K | -4.7% | plan · 2 tranches |
| Aug 12, 2026 | Knopp Kevin J.President and CEO · O·D | ▼ Sale | 149,013 | $9.9 | $1.5M | -20.3% | plan · 4 tranches |
| Aug 11, 2026 | Brown Christopher D.D | ▼ Sale | 17,800 | $9.12 | $162K | -2.2% | plan · 2 tranches |
| Aug 5, 2026 | Brown Christopher D.D | ▼ Sale | 20,000 | $8.49 | $170K | -2.4% | plan |
| Aug 4, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 50,000 | $8.36 | $418K | -1% | indirect |
| Jul 2, 2026 | Knopp Kevin J.President and CEO · O·D | ▼ Sale | 222 | $9.07 | $2K | — | plan |
| Jul 2, 2026 | Brown Christopher D.D | ▼ Sale | 2,200 | $9.02 | $20K | -0.3% | plan |
| Jun 30, 2026 | Brown Christopher D.D | ▼ Sale | 20,000 | $8.84 | $177K | -2.3% | plan |
| Jun 26, 2026 | Knopp Kevin J.President and CEO · O·D | ▼ Sale | 2,798 | $9.09 | $25K | -0.4% | plan |
| Jun 25, 2026 | Knopp Kevin J.President and CEO · O·D | ▼ Sale | 60,345 | $9.12 | $551K | -7.6% | plan · 3 tranches |
| Jun 23, 2026 | Brown Christopher D.D | ▼ Sale | 9,900 | $9.04 | $89K | -1.1% | plan |
| Jun 23, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 7,718 | $9 | $69K | -0.2% | 2 tranches · indirect |
| Jun 4, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 42,282 | $8.97 | $379K | -0.9% | 2 tranches · indirect |
| Jun 4, 2026 | Brown Christopher D.D | ▼ Sale | 100 | $9 | $900 | — | plan |
| Jun 3, 2026 | Brown Christopher D.D | ▼ Sale | 20,000 | $8.73 | $175K | -2.2% | plan |
| May 28, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 186,942 | $8.62 | $1.6M | -3.7% | 3 tranches · indirect |
| May 28, 2026 | Brown Christopher D.D | ▼ Sale | 30,000 | $9 | $270K | -3.2% | plan |
| May 28, 2026 | Griffith Joseph H. IVChief Financial Officer · O | ▼ Sale | 6,940 | $9.03 | $63K | -5% | plan |
| May 8, 2026 | Kenneweg JohnSVP, Sales & Product Marketing · O | ▼ Sale | 18,255 | $8.11 | $148K | -24% | — |
| May 8, 2026 | AWM Investment Company, Inc.10% | ▼ Sale | 78,209 | $8.08 | $632K | -1.5% | 4 tranches · indirect |
| May 6, 2026 | Brown Christopher D.D | ▼ Sale | 20,000 | $7.23 | $145K | -2.1% | plan |
| May 1, 2026 | Kenneweg JohnSVP, Sales & Product Marketing · O | ▼ Sale | 7,787 | $6.83 | $53K | -9.3% | — |
| Apr 10, 2026 | McCallion Kevin J.SVP, Products and Production · O | ▼ Sale | 2,693 | $7.01 | $19K | -5.7% | plan |
| Apr 10, 2026 | Brown Christopher D.D | ▼ Sale | 40,000 | $7.06 | $282K | -4.1% | plan · 3 tranches |
| Apr 9, 2026 | McCallion Kevin J.SVP, Products and Production · O | ▼ Sale | 24,000 | $7.05 | $169K | -34.8% | plan · 2 tranches |
| Mar 2, 2026 | McCallion Kevin J.SVP, Products and Production · O | ▼ Sale | 7 | $7 | $49 | — | plan |
| Feb 2, 2026 | Knopp Kevin J.President and CEO · O·D | ▼ Sale | 34,764 | $6.18 | $215K | -4.2% | — |
| Feb 2, 2026 | Griffith Joseph H. IVChief Financial Officer · O | ▼ Sale | 23,175 | $6.18 | $143K | -14.2% | — |
| Oct 3, 2025 | Griffith Joseph H. IVChief Financial Officer · O | ▼ Sale | 5,000 | $9.05 | $45K | -5.1% | plan · 2 tranches |
| Sep 19, 2025 | Griffith Joseph H. IVChief Financial Officer · O | ▼ Sale | 5,000 | $7.07 | $35K | -4.9% | plan |
Every $MASS filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? 908 Devices filings can reach your inbox instead.
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $MASS feed.