908 Devices Inc. (MASS) has 20 known insider and institutional holders on record. The largest holder is AWM Investment Company, Inc. with 5,199,924 shares. Other notable holders include LEIGHTON DOUGLAS and Keber Vincent.
Over the last 12 months, insiders have made 40 transactions in MASS stock — 15 buys (valued at $1.37M) and 8 sells (valued at $314.56K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
MASS Insider Ownership
Top Holder
AWM Investment Company, Inc.
5,199,924 shares
Buys (12 mo)
15
$1.37M value
Sells (12 mo)
8
$314.56K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Awm Investment Company, Inc. |
10 Percent Owner |
5,199,924 |
2025-03-14 |
|
| 2 |
Leighton Douglas |
10 Percent Owner |
923,371 |
2015-03-02 |
|
| 3 |
Keber Vincent |
Director |
250,000 |
2015-03-02 |
|
| 4 |
Knopp Kevin J. |
President and CEO |
90,043 |
2026-02-03 |
|
| 5 |
Basarsky Trent A. |
VP, Corporate Development |
80,000 |
2022-04-28 |
|
| 6 |
Griffith Joseph H. Iv |
Chief Financial Officer |
52,967 |
2026-02-03 |
|
| 7 |
Mccallion Kevin J. |
SVP, Products and Production |
26,686 |
2026-03-05 |
|
| 8 |
Vann Brandi C |
Director |
15,577 |
2025-08-18 |
|
| 9 |
Seeb Ean |
Director |
15,000 |
2015-03-13 |
|
| 10 |
Ramsey John Michael |
Director |
14,410 |
2020-12-21 |
|
| 11 |
Eisenberg Marcia |
Director |
11,364 |
2024-06-14 |
|
| 12 |
Turner Michael S. |
Chief Legal & Admin Officer |
8,521 |
2025-06-18 |
|
| 13 |
Kenneweg John |
Vice President, Government |
8,104 |
2022-03-03 |
|
| 14 |
Hrusovsky E Kevin |
Director |
6,516 |
2025-06-13 |
|
| 15 |
Eloi Fenel M |
Director |
6,516 |
2025-06-13 |
|
| 16 |
Crandell Keith |
10 Percent Owner |
6,516 |
2025-06-13 |
|
| 17 |
Hunt Anthony |
Director |
6,516 |
2025-06-13 |
|
| 18 |
George Jeffrey P. |
Director |
6,516 |
2025-06-13 |
|
| 19 |
Leonhart Michele M. |
Director |
6,485 |
2025-06-27 |
|
| 20 |
Brown Christopher D. |
Chief Product Officer |
5,027 |
2025-02-04 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-02-26 |
Kenneweg John |
SVP, Sales & Product Marketing |
Unknown |
27,656 |
$0.96 |
$26.55K |
| 2026-03-02 |
Mccallion Kevin J. |
SVP, Products and Production |
Option Exercise (Sell) |
7 |
$1.05 |
$7.35 |
| 2026-02-26 |
Levine Mark S. |
Chief Legal and Admin. Officer |
Unknown |
98,242 |
- |
- |
| 2026-03-02 |
Mccallion Kevin J. |
SVP, Products and Production |
Informative Sell |
7 |
$7.00 |
$49.00 |
| 2026-02-26 |
Mccallion Kevin J. |
SVP, Products and Production |
Unknown |
48,466 |
- |
- |
| 2026-02-01 |
Brown Christopher D. |
Director |
Option Exercise (Sell) |
5,027 |
- |
- |
| 2025-12-30 |
Spoto Mark |
Director |
Gift (Given) |
928 |
- |
- |
| 2025-10-14 |
Spoto Mark |
Director |
Inheritance (Buy) |
928 |
- |
- |
| 2026-02-02 |
Knopp Kevin J. |
President and CEO |
RSU Award |
90,043 |
$6.19 |
$557.37K |
| 2026-02-01 |
Knopp Kevin J. |
President and CEO |
Option Exercise (Sell) |
11,255 |
- |
- |
| 2026-02-02 |
Griffith Joseph H. Iv |
Chief Financial Officer |
RSU Award |
52,967 |
$6.19 |
$327.87K |
| 2026-02-01 |
Griffith Joseph H. Iv |
Chief Financial Officer |
Option Exercise (Sell) |
5,102 |
- |
- |
| 2025-10-03 |
Griffith Joseph H. Iv |
Chief Financial Officer |
Informative Sell |
4,292 |
$9.05 |
$38.85K |
| 2025-10-02 |
Griffith Joseph H. Iv |
Chief Financial Officer |
Informative Sell |
708 |
$9.04 |
$6.4K |
| 2025-09-19 |
Griffith Joseph H. Iv |
Chief Financial Officer |
Informative Sell |
5,000 |
$7.07 |
$35.34K |
| 2025-08-01 |
Vann Brandi C |
Director |
RSU Award |
15,577 |
- |
- |
| 2025-08-01 |
Vann Brandi C |
Officer |
Unknown |
- |
- |
- |
| 2025-06-25 |
Leonhart Michele M. |
Director |
Option Exercise |
6,485 |
$0.00 |
$6.49 |
| 2025-06-13 |
Brown Christopher D. |
Director |
Unknown |
32,974 |
- |
- |
| 2025-06-18 |
Turner Michael S. |
Chief Legal & Admin Officer |
Informative Sell |
1,373 |
$7.50 |
$10.3K |
| 2025-06-17 |
Turner Michael S. |
Chief Legal & Admin Officer |
Informative Sell |
7,148 |
$7.51 |
$53.65K |
| 2025-06-16 |
Turner Michael S. |
Chief Legal & Admin Officer |
Informative Sell |
16,082 |
$7.51 |
$120.84K |
| 2025-06-12 |
Leonhart Michele M. |
Director |
RSU Award |
6,516 |
$7.19 |
$46.85K |
| 2025-06-11 |
Eisenberg Marcia |
Director |
Option Exercise (Sell) |
11,364 |
- |
- |
| 2025-06-12 |
Spoto Mark |
Director |
RSU Award |
6,516 |
$7.19 |
$46.85K |
