908 Devices Inc. (MASS) Insider Trading
Over the last 3 months, MASS insiders made 0 open-market buys and 27 sales, a net sale of -$4.7M (SEC Form 4). Over the last 6 months, 77 institutions increased and 81 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
27
Net (3m)
-$4.7M
Insider trades by month Buys Sells
Mar
Apr
May
Jun
Jul
Aug
Context3-month price +22.1%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 27, 2026 | Griffith Joseph H. IVofficer: Chief Financial Officer | Sell | 11,459 | $10.95 |
| Aug 24, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 8,422 | $10.52 |
| Aug 24, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 41,578 | $10.61 |
| Aug 17, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 20,000 | $10.35 |
| Aug 17, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 7,622 | $10.06 |
| Aug 12, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 115,748 | $9.83 |
| Aug 12, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 348 | $9.06 |
| Aug 12, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 2,747 | $10.07 |
| Aug 12, 2026 | Brown Christopher D.director | Sell | 8,358 | $9.23 |
| Aug 12, 2026 | Brown Christopher D.director | Sell | 9,442 | $9.03 |
| Aug 12, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 30,170 | $10.16 |
| Aug 7, 2026 | Brown Christopher D.director | Sell | 20,000 | $8.49 |
| Aug 6, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 50,000 | $8.36 |
| Aug 3, 2026 | Vann Brandi Cdirector | Option | 5,192 | — |
| Jul 7, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 222 | $9.07 |
| Jul 7, 2026 | Brown Christopher D.director | Sell | 2,200 | $9.02 |
| Jul 2, 2026 | Brown Christopher D.director | Sell | 20,000 | $8.84 |
| Jun 30, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 2,798 | $9.09 |
| Jun 25, 2026 | Leonhart Michele M.director | Option | 6,486 | — |
| Jun 25, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 3,422 | $9.06 |
| Jun 25, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 16,388 | $9.10 |
| Jun 25, 2026 | Knopp Kevin J.director, officer: President and CEO | Sell | 40,535 | $9.14 |
| Jun 25, 2026 | Brown Christopher D.director | Sell | 9,900 | $9.04 |
| Jun 24, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 3,050 | $9.00 |
| Jun 24, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 4,668 | $8.99 |
| Jun 12, 2026 | Vann Brandi Cdirector | Grant | 6,209 | $8.22 |
| Jun 12, 2026 | CRANDELL KEITHdirector | Option | 14,083 | — |
| Jun 12, 2026 | Hunt Anthonydirector | Option | 14,083 | — |
| Jun 12, 2026 | ELOI FENEL Mdirector | Grant | 13,656 | — |
| Jun 12, 2026 | Hunt Anthonydirector | Grant | 6,209 | $8.22 |
Source: MASS SEC Form 4 filings, latest Aug 27, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MASS positions over the last 6 months (SEC Form 13F).
Increased
77
New positions
28
Reduced
81
Sold out
11
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| First Light Asset Management, LLC | Increased | 6.3M | Aug 14, 2026 |
| FIRST LIGHT ASSET MANAGEMENT, LLC | Increased | 6.1M | May 15, 2026 |
| AWM INVESTMENT COMPANY, INC. | Unchanged | 5.2M | May 15, 2026 |
| AWM Investment Company, Inc. | Reduced | 4.9M | Aug 14, 2026 |
| ARK Investment Management LLC | Increased | 2.0M | Aug 14, 2026 |
| ARK INVESTMENT MANAGEMENT LLC | Reduced | 1.9M | May 12, 2026 |
| BlackRock, Inc. | Increased | 1.9M | Aug 7, 2026 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | Increased | 1.8M | Aug 14, 2026 |
| BLACKROCK, INC. | Reduced | 1.8M | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 1.3M | Aug 13, 2026 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | Increased | 1.2M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.1M | May 15, 2026 |
| First Eagle Investment Management, LLC | Increased | 930K | Aug 24, 2026 |
| FIRST EAGLE INVESTMENT MANAGEMENT, LLC | Increased | 804K | May 14, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 762K | Aug 12, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.