908 Devices Inc (MASS): Congress and insider trades
Who in Congress and inside the company traded MASS, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- 908 Devices Inc (MASS) is a listed stock on NASDAQ.
- Insiders filed 0 open market buys worth $0 and 38 sells worth $7.4M, the latest filed 2026-09-25 (25 September 2026).
- Data as of 2026-09-29 (29 September 2026).
Insider trades in MASS
as of 2026-09-25| Filed | Insider | Type | Shares | Price | Value | 90 day vs S&P |
|---|---|---|---|---|---|---|
| 25 Sep 2026 | AWM Investment Company, Inc. | sell | 24,000 | $11.36 | $273K | n/a |
| 25 Sep 2026 | AWM Investment Company, Inc. | sell | 1,000 | $11.25 | $11.3K | n/a |
| 27 Aug 2026 | Griffith Joseph H. IV | sell | 11,459 | $10.95 | $125K | n/a |
| 24 Aug 2026 | AWM Investment Company, Inc. | sell | 41,578 | $10.61 | $441K | n/a |
| 24 Aug 2026 | AWM Investment Company, Inc. | sell | 8,422 | $10.52 | $88.6K | n/a |
| 17 Aug 2026 | Knopp Kevin J. | sell | 7,622 | $10.06 | $76.7K | n/a |
| 17 Aug 2026 | Knopp Kevin J. | sell | 20,000 | $10.35 | $207K | n/a |
| 12 Aug 2026 | Knopp Kevin J. | sell | 348 | $9.06 | $3.2K | n/a |
| 12 Aug 2026 | Brown Christopher D. | sell | 9,442 | $9.03 | $85.3K | n/a |
| 12 Aug 2026 | Knopp Kevin J. | sell | 2,747 | $10.07 | $27.7K | n/a |
| 12 Aug 2026 | Brown Christopher D. | sell | 8,358 | $9.23 | $77.1K | n/a |
| 12 Aug 2026 | Knopp Kevin J. | sell | 145,918 | $9.90 | $1.4M | n/a |
| 7 Aug 2026 | Brown Christopher D. | sell | 20,000 | $8.49 | $170K | n/a |
| 6 Aug 2026 | AWM Investment Company, Inc. | sell | 50,000 | $8.36 | $418K | n/a |
| 7 Jul 2026 | Brown Christopher D. | sell | 2,200 | $9.02 | $19.8K | n/a |
| 7 Jul 2026 | Knopp Kevin J. | sell | 222 | $9.07 | $2.0K | n/a |
| 30 Jun 2026 | Knopp Kevin J. | sell | 2,798 | $9.09 | $25.4K | n/a |
| 25 Jun 2026 | Knopp Kevin J. | sell | 16,388 | $9.10 | $149K | n/a |
| 25 Jun 2026 | Brown Christopher D. | sell | 9,900 | $9.04 | $89.5K | n/a |
| 25 Jun 2026 | Knopp Kevin J. | sell | 40,535 | $9.14 | $370K | n/a |
| 25 Jun 2026 | Knopp Kevin J. | sell | 3,422 | $9.06 | $31.0K | n/a |
| 24 Jun 2026 | AWM Investment Company, Inc. | sell | 3,050 | $9.00 | $27.5K | n/a |
| 24 Jun 2026 | AWM Investment Company, Inc. | sell | 4,668 | $8.99 | $42.0K | n/a |
| 4 Jun 2026 | AWM Investment Company, Inc. | sell | 39,782 | $8.97 | $357K | n/a |
| 4 Jun 2026 | AWM Investment Company, Inc. | sell | 2,500 | $8.95 | $22.4K | n/a |
| 4 Jun 2026 | Brown Christopher D. | sell | 20,000 | $8.73 | $175K | n/a |
| 29 May 2026 | AWM Investment Company, Inc. | sell | 16,500 | $8.25 | $136K | n/a |
| 29 May 2026 | Griffith Joseph H. IV | sell | 6,940 | $9.03 | $62.7K | n/a |
| 29 May 2026 | AWM Investment Company, Inc. | sell | 170,442 | $8.66 | $1.5M | n/a |
| 29 May 2026 | Brown Christopher D. | sell | 30,000 | $9.00 | $270K | n/a |
| 7 May 2026 | Brown Christopher D. | sell | 20,000 | $7.23 | $145K | n/a |
| 4 May 2026 | Kenneweg John | sell | 7,787 | $6.83 | $53.2K | n/a |
| 14 Apr 2026 | McCallion Kevin J. | sell | 2,693 | $7.01 | $18.9K | n/a |
| 10 Apr 2026 | Brown Christopher D. | sell | 7,392 | $7.04 | $52.0K | n/a |
| 10 Apr 2026 | McCallion Kevin J. | sell | 5,420 | $7.03 | $38.1K | n/a |
| 10 Apr 2026 | McCallion Kevin J. | sell | 18,580 | $7.05 | $131K | n/a |
| 10 Apr 2026 | Brown Christopher D. | sell | 15,030 | $7.05 | $106K | n/a |
| 10 Apr 2026 | Brown Christopher D. | sell | 17,578 | $7.07 | $124K | n/a |
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Related pages
Frequently asked questions
Who has bought MASS?
0 Congress buys by 0 members and 0 insider buys are on file. The tables on this page list every one.
Did buying MASS after a disclosure beat the market?
No disclosed buy of this stock has matured 90 days yet. A single stock is a small sample.
Sources: Congressional trades: STOCK Act disclosures, collected from CapitolTrades. Insider trades: SEC Form 4 filings, collected from Finviz. Prices: Yahoo Finance daily adjusted closes. Data as of 2026-09-29 (29 September 2026). About these sources.
Not investment advice. Past disclosed trades do not predict future returns. Disclosures are published late, so the trades shown are ones you could only have copied after the fact. Talk to a licensed adviser before you invest.