908 Devices Inc
Ownership
Ownership Structure
Who owns 908 Devices Inc (MASS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 67.9% of the shares are freely tradable; institutional investors hold 90.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| First Light Asset Management, LLC | 15.20 | 6,282,804 | +3.5 | 06/30/2026 |
| Awm Investment Company Inc | 12.58 | 5,199,924 | +0.0 | 03/31/2026 |
| ARK Investment Management LLC | 4.71 | 1,946,685 | -2.0 | 03/31/2026 |
| Arnhold & S. Bleichroeder Advisers, LLC | 4.50 | 1,859,970 | +131.5 | 06/30/2026 |
| BlackRock Inc | 4.28 | 1,767,316 | -1.9 | 03/31/2026 |
| Needham Investment Management, LLC | 3.00 | 1,240,000 | +61.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 2.71 | 1,119,236 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| ARK Genomic Revolution ETF | 4.88 | 2,018,660 | -0.3 | 08/31/2026 |
| ARK Genomic Revolution | 4.63 | 1,914,776 | +4.0 | 06/30/2026 |
| Needham Aggressive Growth Retail | 3.38 | 1,397,650 | +47.1 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| AWM Investment Company, Inc. | 10% Owner | 4,779,773 | 52,577,503 $ | Aug 21, 2026 | indirect |
| Brown Christopher D. | Director | 775,559 | 8,531,149 $ | Sep 2, 2026 | direct |
| Knopp Kevin J. | President and CEO | 555,968 | 6,115,648 $ | Aug 17, 2026 | direct |
| Griffith Joseph H. IV | Chief Financial Officer | 121,497 | 1,336,467 $ | Aug 25, 2026 | direct |
| Vann Brandi C | Director | 5,192 | 57,112 $ | Aug 1, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 2, 2026 | Brown Christopher D. | Director | Sell | 30,000 | 10.58 | 317,400 |
| Aug 25, 2026 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 11,459 | 10.95 | 125,476 |
| Aug 21, 2026 | AWM Investment Company, Inc. | 10% Owner | Sell | 41,578 | 10.61 | 441,159 |
| Aug 20, 2026 | AWM Investment Company, Inc. | 10% Owner | Sell | 8,422 | 10.52 | 88,638 |
| Aug 17, 2026 | Knopp Kevin J. | President and CEO | Sell | 20,000 | 10.35 | 207,000 |
| Aug 13, 2026 | Knopp Kevin J. | President and CEO | Sell | 7,622 | 10.06 | 76,677 |
| Aug 12, 2026 | Knopp Kevin J. | President and CEO | Sell | 2,747 | 10.07 | 27,662 |
| Aug 11, 2026 | Brown Christopher D. | Director | Sell | 8,358 | 9.23 | 77,144 |
| Aug 11, 2026 | Knopp Kevin J. | President and CEO | Sell | 30,170 | 10.16 | 306,527 |
| Aug 11, 2026 | Knopp Kevin J. | President and CEO | Sell | 115,748 | 9.83 | 1,137,803 |
| Aug 10, 2026 | Brown Christopher D. | Director | Sell | 9,442 | 9.03 | 85,261 |
| Aug 10, 2026 | Knopp Kevin J. | President and CEO | Sell | 348 | 9.06 | 3,153 |
| Aug 5, 2026 | Brown Christopher D. | Director | Sell | 20,000 | 8.49 | 169,800 |
| Aug 4, 2026 | AWM Investment Company, Inc. | 10% Owner | Sell | 50,000 | 8.36 | 417,765 |
| Aug 1, 2026 | Vann Brandi C | Director | Other | 5,192 | – | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.