908 Devices Inc. (MASS) Insider Trading
Over the last 3 months, MASS insiders made 0 open-market buys and 22 sales, a net sale of -$4.0M (SEC Form 4). Over the last 6 months, 74 institutions increased and 88 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
22
Net (3m)
-$4.0M
Insider trades by month Buys Sells
Oct
Feb
Mar
Apr
May
Jun
Context3-month price +28.5%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 4, 2026 | Brown Christopher D.director | Sell | 20,000 | $8.73 |
| Jun 4, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 39,782 | $8.97 |
| Jun 4, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 2,500 | $8.95 |
| May 29, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 15,000 | $8.25 |
| May 29, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 170,442 | $8.66 |
| May 29, 2026 | Brown Christopher D.director | Sell | 30,000 | $9.00 |
| May 29, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 1,500 | $8.25 |
| May 29, 2026 | Griffith Joseph H. IVofficer: Chief Financial Officer | Sell | 6,940 | $9.03 |
| May 13, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 5,000 | $8.25 |
| May 11, 2026 | Kenneweg Johnofficer: SVP, Sales & Product Marketing | Sell | 18,255 | $8.11 |
| May 8, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 3,025 | $8.20 |
| May 8, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 5,000 | $8.00 |
| May 8, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 12,819 | $8.20 |
| May 8, 2026 | AWM Investment Company, Inc.10 percent owner | Sell | 57,365 | $8.06 |
| May 7, 2026 | Brown Christopher D.director | Sell | 20,000 | $7.23 |
| May 4, 2026 | Kenneweg Johnofficer: SVP, Sales & Product Marketing | Option | 26,042 | — |
| May 4, 2026 | Kenneweg Johnofficer: SVP, Sales & Product Marketing | Sell | 7,787 | $6.83 |
| Apr 29, 2026 | Kenneweg Johnofficer: SVP, Sales & Product Marketing | Grant | 26,042 | — |
| Apr 22, 2026 | Otitoju Kolawole A.officer: Chief Bus. & Strategy Officer | Grant | 110,193 | — |
| Apr 22, 2026 | Otitoju Kolawole A.officer: Chief Bus. & Strategy Officer | Grant | 146,789 | $7.26 |
| Apr 14, 2026 | McCallion Kevin J.officer: SVP, Products and Production | Sell | 2,693 | $7.01 |
| Apr 14, 2026 | McCallion Kevin J.officer: SVP, Products and Production | Option | 2,693 | $1.05 |
| Apr 10, 2026 | McCallion Kevin J.officer: SVP, Products and Production | Sell | 5,420 | $7.03 |
| Apr 10, 2026 | Brown Christopher D.director | Sell | 15,030 | $7.05 |
| Apr 10, 2026 | Brown Christopher D.director | Sell | 17,578 | $7.07 |
| Apr 10, 2026 | McCallion Kevin J.officer: SVP, Products and Production | Option | 5,420 | $1.05 |
| Apr 10, 2026 | McCallion Kevin J.officer: SVP, Products and Production | Option | 18,580 | $1.05 |
| Apr 10, 2026 | Brown Christopher D.director | Sell | 7,392 | $7.04 |
| Apr 10, 2026 | McCallion Kevin J.officer: SVP, Products and Production | Sell | 18,580 | $7.05 |
| Mar 5, 2026 | McCallion Kevin J.officer: SVP, Products and Production | Sell | 7 | $7.00 |
Source: MASS SEC Form 4 filings, latest Jun 4, 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
74
New positions
30
Reduced
88
Sold out
27
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| FIRST LIGHT ASSET MANAGEMENT, LLC | Increased | 6.1M | May 15, 2026 |
| AWM INVESTMENT COMPANY, INC. | Unchanged | 5.2M | Feb 13, 2026 |
| AWM INVESTMENT COMPANY, INC. | Unchanged | 5.2M | May 15, 2026 |
| FIRST LIGHT ASSET MANAGEMENT, LLC | Increased | 4.8M | Feb 17, 2026 |
| ARK INVESTMENT MANAGEMENT LLC | Increased | 2.0M | Feb 11, 2026 |
| ARK INVESTMENT MANAGEMENT LLC | Reduced | 1.9M | May 12, 2026 |
| BLACKROCK, INC. | Increased | 1.8M | Feb 12, 2026 |
| BLACKROCK, INC. | Reduced | 1.8M | May 13, 2026 |
| VANGUARD GROUP INC | Increased | 1.5M | Jan 29, 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 | 804K | May 14, 2026 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | Increased | 770K | Feb 17, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 695K | May 15, 2026 |
| GRANAHAN INVESTMENT MANAGEMENT, LLC | Increased | 695K | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.