Company profile
908 Devices Inc. Insider Trading
MASSEvery SEC Form 4 insider trading filing for 908 Devices Inc. (MASS) since April 2023: open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Measuring & Controlling Devices, NEC
- CIK
- 0001555279
- Filings
- 119
- Insiders
- 17
- Last filing
- 2026-09-24
Activity summary
Recent insider activity is bearish. Over the last 30 days, insiders net sold $284K across 2 transactions.
Three year balance
Buy and sell value by quarter, Q4 23 to Q3 26. 908 Devices Inc. insiders are net sellers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $4.9M.
90 day insight
Over the last 90 days, 908 Devices Inc. insiders sold $1.2M across 5 transactions with no open-market purchases.
- Most active insider: John Kenneweg with 9 transactions totaling $307K.
- Largest single sale: $1.1M by Kevin J. Knopp on Aug 11, 2026.
- 77% of recent sales were pre-scheduled 10b5-1 trades, typically less informative than open-market activity.
Activity skews bearish: sales outpace buys.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
Showing 5 of 50 transactions. The most significant are picked first.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 24, 2026 | AWM Investment Company, Inc. | MASS | Sale | 24,000 | $11.36 | $273K |
| Aug 21, 2026 | AWM Investment Company, Inc. | MASS | Sale | 41,578 | $10.61 | $441K |
| Aug 20, 2026 | AWM Investment Company, Inc. | MASS | Sale | 8,422 | $10.52 | $89K |
| Aug 4, 2026 | AWM Investment Company, Inc. | MASS | Sale | 50,000 | $8.36 | $418K |
| Jun 22, 2026 | AWM Investment Company, Inc. | MASS | Sale | 4,668 | $8.99 | $42K |
45 more transactions hidden
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-H "X-Api-Key: $KEY"Top insiders
By open-market value traded.
Institutional Ownership
Top 13F-HR holders of 908 Devices Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings: institutional holders report positions within 45 days of quarter end. Joined with insider activity above: see who's loading up institutionally while insiders are trading. Full 13F-HR API →