Security key
65443P102
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 27,947,303
- Total 13F value
- $171,004,387
- Share change
- +1,785,902
- SEC-reported price per share
- $6.12
- Number of holders
- 111
- Value change
- +$11,441,915
- Number of buys
- 39
- Number of sells
- 61
- Shares outstanding
- 38,121,579
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
111
Top holders
10
MASS full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q4 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
ARCH Venture Fund VII, L.P.
Comparable rows
15/15
Latest evidence
31 Mar 2026
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%
ARCH Venture Fund VII, L.P.
15%
AWM Investment Company, Inc.
15%
BlackRock, Inc.
4.6%
VANGUARD GROUP INC
3.8%
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 |
| 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. |
13F
13D/G
Company
|
15%
from 13D/G
|
$27,299,601
5,199,924 shares
|
— | 31 Dec 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
4.6%
from 13D/G
|
$9,459,304
1,801,772 shares
|
— | 31 Dec 2025 |
| VANGUARD GROUP INC |
13F
13D/G
Company · The Vanguard Group
|
3.8%
from 13D/G
|
$7,722,037
1,470,864 shares
|
— | 31 Dec 2025 |
| STATE STREET CORP |
13D/G
13F
STATE STREET CORPORATION · Company
|
1.6%
|
$3,219,988
596,294 shares
|
-$9,127,836 | 31 Dec 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 Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
111
Shares
27,947,303
Rows available
111
| 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 Q1 2026 vs Q4 2025 Across Filers
Q4 2025 holders
118
Q1 2026 holders
111
Holder diff
-7
| Investor | Q4 2025 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend