MASS
908 Devices Inc.$9.92+0.19 (+1.95%)Prev Close$9.73·MCap$383.6M·P/E12.52·Vol159.9K·Yield—
▲
Buys (12M)
0
$0.00
▼
Sells (12M)
30
$6.22M
◆
Net Activity
Net Seller
$6.22M
●
Active Insiders
6
last 12 mo
Over the past 12 months, insider activity at 908 Devices Inc. (MASS) has been exclusively selling, with 0 insider purchases totaling $0.00 and 30 insider sales totaling $6.22M. The most recent insider transaction was by Brown Christopher D. (director), who sold $317.4K worth of shares on Sep 4, 2026. 908 Devices Inc. operates in the Healthcare sector, within the Medical - Specialties industry, with a market cap of $383.6M.
MASS Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Brown Christopher D. | director | Sell | 30,000 | $10.58 | $317.4K | 775,559 |
| Aug 27, 2026 | Griffith Joseph H. IV | officer: Chief Financial Officer | Sell | 11,459 | $10.95 | $125.5K | 121,497 |
| Aug 24, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 50,000 | $10.60 | $529.8K | 4,821,351 |
| Aug 17, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 27,622 | $10.27 | $283.7K | 575,968 |
| Aug 12, 2026 | Brown Christopher D. | director | Sell | 17,800 | $9.12 | $162.4K | 813,917 |
| Aug 12, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 149,013 | $9.90 | $1.48M | 732,255 |
| Aug 7, 2026 | Brown Christopher D. | director | Sell | 20,000 | $8.49 | $169.8K | 823,359 |
| Aug 6, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 50,000 | $8.36 | $417.8K | 4,829,773 |
| Jul 7, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 222 | $9.07 | $2.0K | 732,603 |
| Jul 7, 2026 | Brown Christopher D. | director | Sell | 2,200 | $9.02 | $19.8K | 843,359 |
| Jul 2, 2026 | Brown Christopher D. | director | Sell | 20,000 | $8.84 | $176.8K | 845,559 |
| Jun 30, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 2,798 | $9.09 | $25.4K | 732,825 |
| Jun 25, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 60,345 | $9.12 | $550.6K | 792,546 |
| Jun 25, 2026 | Brown Christopher D. | director | Sell | 9,900 | $9.04 | $89.5K | 865,559 |
| Jun 24, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 7,718 | $9.00 | $69.4K | 4,882,823 |
| Jun 5, 2026 | Brown Christopher D. | director | Sell | 100 | $9.00 | $900.00 | 875,459 |
| Jun 4, 2026 | Brown Christopher D. | director | Sell | 20,000 | $8.73 | $174.6K | 875,559 |
| May 29, 2026 | Brown Christopher D. | director | Sell | 30,000 | $9.00 | $270.0K | 895,559 |
| May 29, 2026 | Griffith Joseph H. IV | officer: Chief Financial Officer | Sell | 6,940 | $9.03 | $62.7K | 132,956 |
| May 13, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 5,000 | $8.25 | $41.3K | 5,116,715 |
| May 11, 2026 | Kenneweg John | officer: SVP, Sales & Product Marketing | Sell | 18,255 | $8.11 | $148.0K | 57,784 |
| May 7, 2026 | Brown Christopher D. | director | Sell | 20,000 | $7.23 | $144.6K | 925,559 |
| May 4, 2026 | Kenneweg John | officer: SVP, Sales & Product Marketing | Sell | 7,787 | $6.83 | $53.2K | 76,039 |
| Apr 14, 2026 | McCallion Kevin J. | officer: SVP, Products and Production | Sell | 2,693 | $7.01 | $18.9K | 44,925 |
| Apr 10, 2026 | Brown Christopher D. | director | Sell | 40,000 | $7.06 | $282.3K | 970,529 |
| Apr 10, 2026 | McCallion Kevin J. | officer: SVP, Products and Production | Sell | 24,000 | $7.05 | $169.1K | 44,925-35% |
| Feb 1, 2026 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 23,175 | $6.18 | $143.2K | 0 |
| Feb 1, 2026 | Knopp Kevin J. | President and CEO | Sell | 34,764 | $6.18 | $214.8K | 0 |
| Oct 2, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 5,000 | $9.05 | $45.2K | 0 |
| Sep 19, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 5,000 | $7.07 | $35.3K | 0 |
| Jun 16, 2025 | Turner Michael S. | Chief Legal & Admin Officer | Sell | 24,603 | $7.51 | $184.8K | 0 |
| Jun 4, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 6,940 | $7.08 | $49.1K | 0 |
| May 15, 2025 | Knopp Kevin J. | President and CEO | Buy | 15,000 | $4.44 | $66.6K | 0 |
| May 14, 2025 | Knopp Kevin J. | President and CEO | Buy | 15,000 | $4.32 | $64.8K | 0 |
| May 14, 2025 | Spoto Mark | Director | Buy | 10,000 | $4.29 | $42.9K | 0 |
| Feb 4, 2025 | Brown Christopher D. | Chief Product Officer | Sell | 7,767 | $2.34 | $18.2K | 968,222 |
| Feb 4, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 10,236 | $2.34 | $24.0K | 118,146 |
| Feb 4, 2025 | Knopp Kevin J. | President and CEO | Sell | 16,001 | $2.32 | $37.1K | 704,416 |
| Feb 4, 2025 | Turner Michael S. | Chief Legal & Admin Officer | Sell | 9,672 | $2.33 | $22.5K | 32,572 |
| May 13, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $6.42 | $64.2K | 508,981 |
| May 10, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.77 | $57.7K | 498,981 |
| May 9, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.83 | $58.3K | 488,981 |
| May 8, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.72 | $57.2K | 478,981 |
| May 7, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.60 | $56.0K | 468,981 |
| Feb 2, 2024 | Brown Christopher D. | Chief Product Officer | Sell | 3,957 | $7.01 | $27.7K | 888,752 |
| Feb 2, 2024 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 15,409 | $7.06 | $108.8K | 93,521 |
| Feb 2, 2024 | Knopp Kevin J. | President and CEO | Sell | 9,071 | $7.00 | $63.5K | 416,953 |
| Feb 2, 2024 | Turner Michael S. | Chief Legal & Admin Officer | Sell | 5,232 | $6.99 | $36.6K | 12,721-29% |
| Jan 2, 2024 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 6,000 | $12.08 | $72.5K | 80,000 |
| Dec 21, 2023 | Brown Christopher D. | Chief Product Officer | Sell | 20,000 | $9.10 | $182.0K | 891,815 |
Showing 1–50 of 122
1 / 3
MASS Insider Buying Activity
The following table shows recent insider purchases of 908 Devices Inc. (MASS) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| May 15, 2025 | Knopp Kevin J. | President and CEO | Buy | 15,000 | $4.44 | $66.6K | 0 |
| May 14, 2025 | Knopp Kevin J. | President and CEO | Buy | 15,000 | $4.32 | $64.8K | 0 |
| May 14, 2025 | Spoto Mark | Director | Buy | 10,000 | $4.29 | $42.9K | 0 |
| May 13, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $6.42 | $64.2K | 508,981 |
| May 10, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.77 | $57.7K | 498,981 |
| May 9, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.83 | $58.3K | 488,981 |
| May 8, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.72 | $57.2K | 478,981 |
| May 7, 2024 | Knopp Kevin J. | President and CEO | Buy | 10,000 | $5.60 | $56.0K | 468,981 |
MASS Insider Selling Activity
The following table shows recent insider sales of 908 Devices Inc. (MASS) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Brown Christopher D. | director | Sell | 30,000 | $10.58 | $317.4K | 775,559 |
| Aug 27, 2026 | Griffith Joseph H. IV | officer: Chief Financial Officer | Sell | 11,459 | $10.95 | $125.5K | 121,497 |
| Aug 24, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 50,000 | $10.60 | $529.8K | 4,821,351 |
| Aug 17, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 27,622 | $10.27 | $283.7K | 575,968 |
| Aug 12, 2026 | Brown Christopher D. | director | Sell | 17,800 | $9.12 | $162.4K | 813,917 |
| Aug 12, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 149,013 | $9.90 | $1.48M | 732,255 |
| Aug 7, 2026 | Brown Christopher D. | director | Sell | 20,000 | $8.49 | $169.8K | 823,359 |
| Aug 6, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 50,000 | $8.36 | $417.8K | 4,829,773 |
| Jul 7, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 222 | $9.07 | $2.0K | 732,603 |
| Jul 7, 2026 | Brown Christopher D. | director | Sell | 2,200 | $9.02 | $19.8K | 843,359 |
| Jul 2, 2026 | Brown Christopher D. | director | Sell | 20,000 | $8.84 | $176.8K | 845,559 |
| Jun 30, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 2,798 | $9.09 | $25.4K | 732,825 |
| Jun 25, 2026 | Knopp Kevin J. | director, officer: President and CEO | Sell | 60,345 | $9.12 | $550.6K | 792,546 |
| Jun 25, 2026 | Brown Christopher D. | director | Sell | 9,900 | $9.04 | $89.5K | 865,559 |
| Jun 24, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 7,718 | $9.00 | $69.4K | 4,882,823 |
| Jun 5, 2026 | Brown Christopher D. | director | Sell | 100 | $9.00 | $900.00 | 875,459 |
| Jun 4, 2026 | Brown Christopher D. | director | Sell | 20,000 | $8.73 | $174.6K | 875,559 |
| May 29, 2026 | Brown Christopher D. | director | Sell | 30,000 | $9.00 | $270.0K | 895,559 |
| May 29, 2026 | Griffith Joseph H. IV | officer: Chief Financial Officer | Sell | 6,940 | $9.03 | $62.7K | 132,956 |
| May 13, 2026 | AWM Investment Company, Inc. | 10 percent owner | Sell | 5,000 | $8.25 | $41.3K | 5,116,715 |
| May 11, 2026 | Kenneweg John | officer: SVP, Sales & Product Marketing | Sell | 18,255 | $8.11 | $148.0K | 57,784 |
| May 7, 2026 | Brown Christopher D. | director | Sell | 20,000 | $7.23 | $144.6K | 925,559 |
| May 4, 2026 | Kenneweg John | officer: SVP, Sales & Product Marketing | Sell | 7,787 | $6.83 | $53.2K | 76,039 |
| Apr 14, 2026 | McCallion Kevin J. | officer: SVP, Products and Production | Sell | 2,693 | $7.01 | $18.9K | 44,925 |
| Apr 10, 2026 | Brown Christopher D. | director | Sell | 40,000 | $7.06 | $282.3K | 970,529 |
| Apr 10, 2026 | McCallion Kevin J. | officer: SVP, Products and Production | Sell | 24,000 | $7.05 | $169.1K | 44,925-35% |
| Feb 1, 2026 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 23,175 | $6.18 | $143.2K | 0 |
| Feb 1, 2026 | Knopp Kevin J. | President and CEO | Sell | 34,764 | $6.18 | $214.8K | 0 |
| Oct 2, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 5,000 | $9.05 | $45.2K | 0 |
| Sep 19, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 5,000 | $7.07 | $35.3K | 0 |
| Jun 16, 2025 | Turner Michael S. | Chief Legal & Admin Officer | Sell | 24,603 | $7.51 | $184.8K | 0 |
| Jun 4, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 6,940 | $7.08 | $49.1K | 0 |
| Feb 4, 2025 | Brown Christopher D. | Chief Product Officer | Sell | 7,767 | $2.34 | $18.2K | 968,222 |
| Feb 4, 2025 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 10,236 | $2.34 | $24.0K | 118,146 |
| Feb 4, 2025 | Knopp Kevin J. | President and CEO | Sell | 16,001 | $2.32 | $37.1K | 704,416 |
| Feb 4, 2025 | Turner Michael S. | Chief Legal & Admin Officer | Sell | 9,672 | $2.33 | $22.5K | 32,572 |
| Feb 2, 2024 | Brown Christopher D. | Chief Product Officer | Sell | 3,957 | $7.01 | $27.7K | 888,752 |
| Feb 2, 2024 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 15,409 | $7.06 | $108.8K | 93,521 |
| Feb 2, 2024 | Knopp Kevin J. | President and CEO | Sell | 9,071 | $7.00 | $63.5K | 416,953 |
| Feb 2, 2024 | Turner Michael S. | Chief Legal & Admin Officer | Sell | 5,232 | $6.99 | $36.6K | 12,721-29% |
| Jan 2, 2024 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 6,000 | $12.08 | $72.5K | 80,000 |
| Dec 21, 2023 | Brown Christopher D. | Chief Product Officer | Sell | 20,000 | $9.10 | $182.0K | 891,815 |
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