Security key
65443P102
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 1,292,054
- Total 13F value
- $15,935,791
- Share change
- +148,235
- SEC-reported price per share
- $12.34
- Number of holders
- 21
- Value change
- +$1,830,104
- Number of buys
- 9
- Number of sells
- 5
- Shares outstanding
- 41,621,204
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2026
Institutions
21
Top holders
10
MASS full security history
Ownership snapshot
Full 13F holder table
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
7/15
Latest evidence
30 Sep 2026
13F
13D/G
3/4/5
Lead comparable stake: 17%
8 rows are not safely comparable across share classes.
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%.
7 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.
14%
AWM Investment Company, Inc.
12%
ARK Investment Management LLC
5.3%
BlackRock, Inc.
4.9%
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 |
13F
13D/G
Company · Mathew P. Arens
|
17%
Reported 13D/G
· 31 Dec 2025
|
$54,660,395
6,282,804 shares
|
— | 30 Jun 2026 |
| ARCH Venture Fund VII, L.P. |
13D/G
Keith Crandell
|
14%
Reported 13D/G
· 30 Jun 2026
|
$46,307,772
5,824,877 shares
|
+$124,505 | 30 Jun 2026 |
| AWM Investment Company, Inc. |
3/4/5
13D/G
13F
10%+ Owner · Company
|
12%
Reported 13D/G
· 30 Jun 2026
|
$195,840,347
19,259,810 shares
mixed-class rows
|
-$4,172,897 | 29 Sep 2026 |
| ARK Investment Management LLC |
13F
13D/G
Company
|
5.3%
Reported 13D/G
· 30 Jun 2026
|
$17,642,905
2,027,920 shares
|
— | 30 Jun 2026 |
| BlackRock, Inc. |
13D/G
13F
Company
|
4.9%
Reported 13D/G
· 30 Sep 2026
|
$25,166,677
2,039,439 shares
|
+$1,218,563 | 30 Sep 2026 |
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
3.8%
Reported 13D/G
· 31 Dec 2024
|
$6,927,313
1,324,534 shares
|
$0 | 31 Dec 2024 |
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 Q3 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
21
Shares
1,292,054
Rows available
21
| 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 Q3 2026 vs Q2 2026 Across Filers
Q2 2026 holders
110
Q3 2026 holders
21
Holder diff
-89
| Investor | Q2 2026 Shares | Q3 2026 Shares | Share Diff | Share Chg % | Q2 2026 value | Q3 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend