MASS
908 DEVICES (MASS)
NASDAQ
$8.66-$0.20 (-2.20%)
Price as of Jun 03, 2026 4:15 PM EDT
  • $318.0M
    Market Cap
  • 33.69%
    1-Year Change
  • Medical Devices
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
FIRST LIGHT ASSET MANAGEMENT, LLC
16.06%
6.1M
+1.2M (+20.36%)
Mar 31, 2026
AWM INVESTMENT COMPANY, INC.
13.75%
5.2M
0 (0.00%)
Mar 31, 2026
ARK INVESTMENT MANAGEMENT LLC
5.15%
1.9M
-39,301 (-2.02%)
Mar 31, 2026
BLACKROCK FUNDING, INC. /DE
5.10%
1.9M
+42,538 (+2.21%)
Dec 31, 2024
BLACKROCK, INC.
4.67%
1.8M
-34,456 (-1.95%)
Mar 31, 2026
BLACKROCK INC.
4.48%
1.7M
-39,922 (-2.36%)
Jun 30, 2024
VANGUARD GROUP INC
3.89%
1.5M
+49,132 (+3.34%)
Dec 31, 2025

Current Ownership Distribution

  • Institutions387.9M (71.09%)
  • Mutual Funds144.4M (26.47%)
  • Insiders13.3M (2.44%)
  • Other0 (0.00%)

Insider Transactions

  • 2.44% (13.3M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 7
    Number of InsiderSelling (last 12 months)
  • $377.4M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Griffith Joseph H. IV
Chief Financial Officer
Sell
May 28, 2026
$62,668.20
6,940
$9.03
132,956
Brown Christopher D.
Sell
May 28, 2026
$270,000.00
30,000
$9.00
895,559
AWM Investment Company, Inc.
Sell
May 28, 2026
$1.5M
170,442
$8.66
4.9M
AWM Investment Company, Inc.
Sell
May 27, 2026
$12,375.00
1,500
$8.25
5.1M
AWM Investment Company, Inc.
Sell
May 27, 2026
$123,790.50
15,000
$8.25
5.1M
AWM Investment Company, Inc.
Sell
May 11, 2026
$41,257.00
5,000
$8.25
5.1M
Kenneweg John
SVP, Sales & Product Marketing
Sell
May 08, 2026
$148,048.05
18,255
$8.11
57,784
AWM Investment Company, Inc.
Sell
May 08, 2026
$24,805.00
3,025
$8.20
5.1M
AWM Investment Company, Inc.
Sell
May 07, 2026
$105,169.64
12,819
$8.20
5.1M
Brown Christopher D.
Sell
May 06, 2026
$144,600.00
20,000
$7.23
925,559
AWM Investment Company, Inc.
Sell
May 06, 2026
$40,000.00
5,000
$8.00
5.2M
AWM Investment Company, Inc.
Sell
May 06, 2026
$462,155.39
57,365
$8.06
5.1M
Kenneweg John
SVP, Sales & Product Marketing
Exempt
May 01, 2026
$0.00
26,042
$0.00
0
Kenneweg John
SVP, Sales & Product Marketing
Exempt
May 01, 2026
$0.00
26,042
$0.00
83,826
Kenneweg John
SVP, Sales & Product Marketing
Sell
May 01, 2026
$53,185.21
7,787
$6.83
76,039
Kenneweg John
SVP, Sales & Product Marketing
Award
Apr 28, 2026
$0.00
26,042
$0.00
26,042
Brown Christopher D.
Sell
Apr 10, 2026
$124,276.46
17,578
$7.07
945,559
Brown Christopher D.
Sell
Apr 09, 2026
$52,039.68
7,392
$7.04
963,137
Brown Christopher D.
Sell
Apr 08, 2026
$105,961.50
15,030
$7.05
970,529
McCallion Kevin J.
SVP, Products and Production
Sell
Mar 02, 2026
$49.00
7
$7.00
44,918
Griffith Joseph H. IV
Chief Financial Officer
Award
Feb 02, 2026
$0.00
121,164
$0.00
121,164
Knopp Kevin J.
President and CEO
Award
Feb 02, 2026
$0.00
205,978
$0.00
205,978
Griffith Joseph H. IV
Chief Financial Officer
Award
Feb 02, 2026
$0.00
52,967
$0.00
52,967
Knopp Kevin J.
President and CEO
Award
Feb 02, 2026
$0.00
90,043
$0.00
90,043
Griffith Joseph H. IV
Chief Financial Officer
Sell
Feb 02, 2026
$143,221.50
23,175
$6.18
139,896
Knopp Kevin J.
President and CEO
Sell
Feb 02, 2026
$214,841.52
34,764
$6.18
795,968
Brown Christopher D.
Exempt
Feb 01, 2026
$0.00
5,027
$0.00
0
Knopp Kevin J.
President and CEO
Exempt
Feb 01, 2026
$0.00
11,255
$0.00
733,988
Griffith Joseph H. IV
Chief Financial Officer
Exempt
Feb 01, 2026
$0.00
5,102
$0.00
98,032
Knopp Kevin J.
President and CEO
Exempt
Feb 01, 2026
$0.00
13,449
$0.00
747,437