Comparable stake leader
First Light Asset Management, LLC
SEC ownership of 908 Devices Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001555279.
Disclosed value leader
AWM Investment Company, Inc.
Comparable rows
50/50
Latest evidence
22 Jun 2026
- Public ticker
- MASS on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
First Light Asset Management, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
First Light Asset Management, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
22 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001555279
- Issuer location
- Burlington, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of 908 Devices Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
First Light Asset Managem...
Disclosed value leader
AWM Investment Company, Inc.
Comparable rows
50/50
Latest evidence
22 Jun 2026
13F
13D/G
3/4/5
Lead comparable stake: 17%
13D/G row: First Light Asset Management, LLC
Showing 1-8 of 50 holder rows.
Quick read
First Light Asset Management, LLC leads the comparable SEC ownership view at 17%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens First Light Asset Management, LLC's linked filing trail.
Comparable ownership
Top 5
First Light Asset Management, LLC
17%
ARCH Venture Fund VII, L.P.
15%
AWM Investment Company, Inc.
15%
ARK Investment Management LLC
4.9%
BlackRock, Inc.
4.6%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| First Light Asset Management, LLC |
13F
13D/G
Company · Mathew P. Arens
|
17%
from 13D/G
|
$37,164,086
6,072,563 shares
|
— | 31 Mar 2026 |
| ARCH Venture Fund VII, L.P. |
13D/G
Keith Crandell
|
15%
|
$41,477,802
5,809,216 shares
|
$0 | 31 Mar 2026 |
| AWM Investment Company, Inc. |
3/4/5
13D/G
13F
10%+ Owner · Company
|
15%
from 13D/G
|
$130,000,286
14,883,979 shares
mixed-class rows
|
-$2,734,137 | 22 Jun 2026 |
| ARK Investment Management LLC |
13D/G
13F
Company
|
4.9%
|
$14,933,824
1,883,206 shares
|
-$559,588 | 31 May 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
4.6%
from 13D/G
|
$10,815,974
1,767,316 shares
|
— | 31 Mar 2026 |
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
3.8%
|
$6,927,313
1,324,534 shares
|
$0 | 31 Dec 2024 |
| STATE STREET CORP |
13F
13D/G
Company · STATE STREET CORPORATION
|
1.6%
from 13D/G
|
$3,830,459
625,892 shares
|
— | 31 Mar 2026 |
| AMERIPRISE FINANCIAL INC |
13D/G
|
0%
|
$1,653
316 shares
|
$0 | 31 Mar 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$5,361,246.
Buys
$0
Insiders: 0
Sells
$5,361,246
Insiders: 6
Net
-$5,361,246
Shares: -653,330
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 653,330
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 518,698 | $0 | $4,452,350 | -$4,452,350 |
| 3-6 | 0 | 124,632 | $0 | $828,310 | -$828,310 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 10,000 | $0 | $80,585 | -$80,585 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 22 reporting-owner rows connected to 908 Devices Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
22
Largest Forms 3/4/5 holder
AWM Investment Company, Inc.
Net 12M change
-$5,361,246
Latest report
02 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| AWM Investment Company, Inc. | 10%+ Owner | $130,000,286 | -$2,734,137 | -2.1% | Filing P/S | 22 Jun 2026 |
| Keith Crandell | Director | $35,278,243 | Mixed | 10 Jun 2026 | ||
| Kevin J. Knopp | President and CEO, Director | $11,353,349 | -$792,913 | -6.5% | Mixed | 02 Jul 2026 |
| Christopher D. Brown | Director | $7,607,098 | -$1,158,518 | -13% | Filing P/S | 02 Jul 2026 |
| E. Kevin Hrusovsky | Director | $3,029,797 | Mixed | 10 Jun 2026 | ||
| Joseph H. Griffith IV | Chief Financial Officer | $1,200,592 | -$286,475 | -19% | Filing P/S | 28 May 2026 |
| Trent A. Basarsky | VP, Corporate Development | $966,400 | Mixed | 27 Apr 2022 | ||
| Mark Spoto | Director | $568,822 | Mixed | 10 Jun 2026 | ||
| John Kenneweg | SVP, Sales & Product Marketing | $468,628 | -$201,233 | -30% | Filing P/S | 08 May 2026 |
| Nicolas Barthelemy | Director | $349,353 | Mixed | 15 Jun 2022 | ||
| Kevin J. McCallion | SVP, Products and Production | $314,924 | -$187,970 | -37% | Filing P/S | 10 Apr 2026 |
| Anthony Hunt | Director | $270,308 | Mixed | 10 Jun 2026 | ||
| Fenel M. Eloi | Director | $250,289 | Mixed | 10 Jun 2026 | ||
| Michele M. Leonhart | Director | $165,570 | Mixed | 25 Jun 2026 | ||
| Jeffrey P. George | Director | $124,685 | Mixed | 11 Jun 2025 | ||
| Marcia Eisenberg | Director | $120,700 | Mixed | 11 Jun 2025 | ||
| Maura Fitzpatrick | VP, Product Management & Mktg | $34,235 | Mixed | 01 Feb 2023 | ||
| Michael S. Turner | Chief Legal & Admin Officer | $0 | Mixed | 16 Jun 2025 | ||
| Mark S. Levine | Chief Legal and Admin. Officer | Mixed | 26 Feb 2026 | |||
| Michele Fournier | Chief People Officer | Mixed | 29 Apr 2022 |
Recent insider transactions for 908 Devices Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Kevin J. Knopp | MASS | Common Stock | Sale | -0.03% | $2,014 | $9.07 | -222 | 732,603 | 02 Jul 2026 | Direct |
| Christopher D. Brown | MASS | Common Stock | Sale | -0.26% | $19,844 | $9.02 | -2,200 | 843,359 | 02 Jul 2026 | Direct |
| Christopher D. Brown | MASS | Common Stock | Sale | -2.31% | $176,800 | $8.84 | -20,000 | 845,559 | 30 Jun 2026 | Direct |
| Kevin J. Knopp | MASS | Common Stock | Sale | -0.38% | $25,434 | $9.09 | -2,798 | 732,825 | 26 Jun 2026 | Direct |
| Kevin J. Knopp | MASS | Common Stock | Sale | -2.18% | $149,131 | $9.10 | -16,388 | 735,623 | 25 Jun 2026 | Direct |
| Michele M. Leonhart | MASS | Common Stock | Options Exercise | 31.5% | 6,486 | 27,054 | 25 Jun 2026 | Direct | ||
| Michele M. Leonhart | MASS | Restricted Stock Units | Options Exercise | -50% | -6,486 | 6,485 | 25 Jun 2026 | Direct | ||
| Kevin J. Knopp | MASS | Common Stock | Sale | -5.11% | $370,490 | $9.14 | -40,535 | 752,011 | 24 Jun 2026 | Direct |
| Christopher D. Brown | MASS | Common Stock | Sale | -1.13% | $89,496 | $9.04 | -9,900 | 865,559 | 23 Jun 2026 | Direct |
| Kevin J. Knopp | MASS | Common Stock | Sale | -0.43% | $31,003 | $9.06 | -3,422 | 792,546 | 23 Jun 2026 | Direct |
| AWM Investment Company, Inc. | MASS | Common Stock | Sale | -0.06% | $27,463 | $9.00 | -3,050 | 4,879,773 | 23 Jun 2026 | By Limited Partnerships |
| AWM Investment Company, Inc. | MASS | Common Stock | Sale | -0.1% | $41,965 | $8.99 | -4,668 | 4,882,823 | 22 Jun 2026 | By Limited Partnerships |
| Brandi C. Vann | MASS | Stock Option (option to buy) | Award | 6,209 | 6,209 | 11 Jun 2026 | Direct | |||
| Brandi C. Vann | MASS | Restricted Stock Units | Award | 13,656 | 13,656 | 11 Jun 2026 | Direct | |||
| Michele M. Leonhart | MASS | Stock Option (option to buy) | Award | 6,209 | 6,209 | 11 Jun 2026 | Direct | |||
| Michele M. Leonhart | MASS | Restricted Stock Units | Award | 13,656 | 13,656 | 11 Jun 2026 | Direct | |||
| E. Kevin Hrusovsky | MASS | Stock Option (option to buy) | Award | 6,209 | 6,209 | 11 Jun 2026 | Direct | |||
| E. Kevin Hrusovsky | MASS | Restricted Stock Units | Award | 13,656 | 13,656 | 11 Jun 2026 | Direct | |||
| Anthony Hunt | MASS | Stock Option (option to buy) | Award | 6,209 | 6,209 | 11 Jun 2026 | Direct | |||
| Anthony Hunt | MASS | Restricted Stock Units | Award | 13,656 | 13,656 | 11 Jun 2026 | Direct | |||
| Fenel M. Eloi | MASS | Stock Option (option to buy) | Award | 6,209 | 6,209 | 11 Jun 2026 | Direct | |||
| Fenel M. Eloi | MASS | Restricted Stock Units | Award | 13,656 | 13,656 | 11 Jun 2026 | Direct | |||
| Keith Crandell | MASS | Stock Option (option to buy) | Award | 6,209 | 6,209 | 11 Jun 2026 | Direct | |||
| Keith Crandell | MASS | Restricted Stock Units | Award | 13,656 | 13,656 | 11 Jun 2026 | Direct | |||
| Mark Spoto | MASS | Stock Option (option to buy) | Award | 6,209 | 6,209 | 11 Jun 2026 | Direct | |||
| Mark Spoto | MASS | Restricted Stock Units | Award | 13,656 | 13,656 | 11 Jun 2026 | Direct | |||
| Michele M. Leonhart | MASS | Common Stock | Options Exercise | 217.2% | 14,083 | 20,568 | 10 Jun 2026 | Direct | ||
| Michele M. Leonhart | MASS | Restricted Stock Units | Options Exercise | -100% | -14,083 | 0 | 10 Jun 2026 | Direct | ||
| E. Kevin Hrusovsky | MASS | Common Stock | Options Exercise | 9.31% | 14,083 | 165,390 | 10 Jun 2026 | Direct | ||
| E. Kevin Hrusovsky | MASS | Restricted Stock Units | Options Exercise | -100% | -14,083 | 0 | 10 Jun 2026 | Direct | ||
| Anthony Hunt | MASS | Common Stock | Options Exercise | 46.8% | 14,083 | 44,168 | 10 Jun 2026 | Direct | ||
| Anthony Hunt | MASS | Restricted Stock Units | Options Exercise | -100% | -14,083 | 0 | 10 Jun 2026 | Direct | ||
| Fenel M. Eloi | MASS | Common Stock | Options Exercise | 52.5% | 14,083 | 40,897 | 10 Jun 2026 | Direct | ||
| Fenel M. Eloi | MASS | Restricted Stock Units | Options Exercise | -100% | -14,083 | 0 | 10 Jun 2026 | Direct | ||
| Keith Crandell | MASS | Common Stock | Options Exercise | 55.7% | 14,083 | 39,374 | 10 Jun 2026 | Direct | ||
| Keith Crandell | MASS | Restricted Stock Units | Options Exercise | -100% | -14,083 | 0 | 10 Jun 2026 | Direct | ||
| Mark Spoto | MASS | Common Stock | Options Exercise | 18.7% | 14,083 | 89,346 | 10 Jun 2026 | Direct | ||
| Mark Spoto | MASS | Restricted Stock Units | Options Exercise | -100% | -14,083 | 0 | 10 Jun 2026 | Direct | ||
| Christopher D. Brown | MASS | Common Stock | Sale | -0.01% | $900 | $9.00 | -100 | 875,459 | 04 Jun 2026 | Direct |
| AWM Investment Company, Inc. | MASS | 908 DEVICES, INC. | Sale | -0.81% | $356,856 | $8.97 | -39,782 | 4,887,491 | 04 Jun 2026 | By Limited Partnership |
| Christopher D. Brown | MASS | Common Stock | Sale | -2.23% | $174,600 | $8.73 | -20,000 | 875,559 | 03 Jun 2026 | Direct |
| AWM Investment Company, Inc. | MASS | 908 DEVICES, INC. | Sale | -0.05% | $22,375 | $8.95 | -2,500 | 4,927,273 | 02 Jun 2026 | By Limited Partnership |
| AWM Investment Company, Inc. | MASS | 908 DEVICES, INC. | Sale | -3.34% | $1,475,925 | $8.66 | -170,442 | 4,929,773 | 28 May 2026 | By Limited Partnership |
| Christopher D. Brown | MASS | Common Stock | Sale | -3.24% | $270,000 | $9.00 | -30,000 | 895,559 | 28 May 2026 | Direct |
| Joseph H. Griffith IV | MASS | Common Stock | Sale | -4.96% | $62,668 | $9.03 | -6,940 | 132,956 | 28 May 2026 | Direct |
| AWM Investment Company, Inc. | MASS | 908 DEVICES, INC. | Sale | -0.32% | $136,166 | $8.25 | -16,500 | 5,100,215 | 27 May 2026 | By Limited Partnership |
| AWM Investment Company, Inc. | MASS | Common Stock | Sale | -0.1% | $41,257 | $8.25 | -5,000 | 5,116,715 | 11 May 2026 | By Limited Partnership |
| John Kenneweg | MASS | Common Stock | Sale | -24% | $148,048 | $8.11 | -18,255 | 57,784 | 08 May 2026 | Direct |
| AWM Investment Company, Inc. | MASS | 908 DEVICES, INC. | Sale | -0.06% | $24,805 | $8.20 | -3,025 | 5,121,715 | 08 May 2026 | By Limited Partnership |
| AWM Investment Company, Inc. | MASS | 908 DEVICES, INC. | Sale | -0.25% | $105,170 | $8.20 | -12,819 | 5,124,740 | 07 May 2026 | By Limited Partnership |
* marks a reported price that did not pass the local price check.