Security key
65443P102
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 26,160,432
- Total 13F value
- $137,344,144
- Share change
- +1,545,937
- Put/Call ratio
- 0%
- SEC-reported price per share
- $5.25
- Number of holders
- 118
- Value change
- +$6,718,786
- Number of buys
- 55
- Number of sells
- 50
- Shares outstanding
- 38,121,579
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
118
Top holders
10
MASS full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q1 2026
Previous quarter: Q3 2025
908 Devices Inc. SEC filings
908 Devices Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 65443P102
Recent filing periods:
Ownership snapshot
Top reported holders of MASS - 908 Devices Inc. - Common Stock (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
15/15
Latest evidence
31 Dec 2025
13D/G
13F
Lead comparable stake: 17%
13D/G row: First Light Asset Management, LLC
Showing 1-6 of 15 holder rows.
Quick read
First Light Asset Management, LLC leads the comparable SEC ownership view at 17%.
15 of 15 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%
AWM Investment Company, Inc.
15%
BlackRock, Inc.
4.6%
VANGUARD GROUP INC
3.8%
STATE STREET CORP
1.6%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| First Light Asset Management, LLC |
13D/G
13F
Mathew P. Arens · Company
|
17%
|
$33,397,591
6,184,739 shares
|
+$8,120,952 | 31 Dec 2025 |
| AWM Investment Company, Inc. |
13F
13D/G
Company
|
15%
from 13D/G
|
$45,551,334
5,199,924 shares
|
— | 30 Sep 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
4.6%
from 13D/G
|
$15,384,357
1,756,205 shares
|
— | 30 Sep 2025 |
| VANGUARD GROUP INC |
13F
13D/G
Company · The Vanguard Group
|
3.8%
from 13D/G
|
$12,454,372
1,421,732 shares
|
— | 30 Sep 2025 |
| STATE STREET CORP |
13F
13D/G
Company · STATE STREET CORPORATION
|
1.6%
from 13D/G
|
$20,136,156
2,298,648 shares
|
— | 30 Sep 2025 |
| 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.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
118
Shares
26,160,432
Rows available
118
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
105
Q4 2025 holders
118
Holder diff
13
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend