MCRB
SERES THERAPEUTI (MCRB)
NASDAQ
$7.23+$0.06 (+0.84%)
Price as of Jun 03, 2026 7:25 PM EDT
  • $70.9M
    Market Cap
  • 0.56%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
FLAGSHIP VENTURES FUND IV, L.P.
145.43%
14.1M
+14.1M (+100.00%)
Mar 31, 2016
FLAGSHIP VENTURES FUND IV GENERAL PARTNER LLC
130.97%
12.7M
+12.7M (+100.00%)
Jun 30, 2016
CVI HOLDINGS, LLC
28.12%
2.7M
+2.7M (+100.00%)
Jun 30, 2022
BLACKROCK INC.
18.20%
1.8M
-5.1M (-287.33%)
Jun 30, 2024
BLACKROCK FUNDING, INC. /DE
18.20%
1.8M
0 (0.00%)
Dec 31, 2024
FLAGSHIP PIONEERING INC.
11.94%
1.2M
0 (0.00%)
Mar 31, 2026
BLACKROCK FUND ADVISORS
11.39%
1.1M
+109,263 (+9.90%)
Dec 31, 2016

Current Ownership Distribution

  • Institutions1.3B (69.65%)
  • Mutual Funds499.1M (27.46%)
  • Insiders52.6M (2.89%)
  • Other0 (0.00%)

Insider Transactions

  • 2.89% (52.6M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 4
    Number of InsiderSelling (last 12 months)
  • $1.3M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Thorell Marella
See Remarks
Award
Mar 04, 2026
$0.00
22,500
$0.00
22,500
Henn Matthew R.
See Remarks
Award
Mar 04, 2026
$0.00
75,000
$0.00
75,000
Brady Kelly
See Remarks
Award
Mar 04, 2026
$0.00
56,250
$0.00
56,250
DesRosier Thomas
See Remarks
Award
Mar 04, 2026
$0.00
22,500
$0.00
22,500
Kender Richard N
See Remarks
Award
Mar 04, 2026
$0.00
150,000
$0.00
150,000
Shaff Eric D.
Exempt
Feb 15, 2026
$0.00
391
$0.00
1,564
Henn Matthew R.
See Remarks
Exempt
Feb 15, 2026
$0.00
141
$0.00
563
Shaff Eric D.
Exempt
Feb 15, 2026
$0.00
333
$0.00
2,656
Young Teresa L.
See Remarks
Exempt
Feb 15, 2026
$0.00
133
$0.00
531
Shaff Eric D.
Exempt
Feb 15, 2026
$0.00
723
$0.00
11,836
DesRosier Thomas
See Remarks
Exempt
Feb 15, 2026
$0.00
133
$0.00
531
Shaff Eric D.
Sell
Feb 15, 2026
$2,193.73
259
$8.47
11,577
Young Teresa L.
See Remarks
Exempt
Feb 15, 2026
$0.00
98
$0.00
780
Henn Matthew R.
See Remarks
Exempt
Feb 15, 2026
$0.00
98
$0.00
780
Young Teresa L.
See Remarks
Exempt
Feb 15, 2026
$0.00
231
$0.00
8,632
DesRosier Thomas
See Remarks
Exempt
Feb 15, 2026
$0.00
111
$0.00
890
Young Teresa L.
See Remarks
Sell
Feb 15, 2026
$635.25
75
$8.47
8,557
Henn Matthew R.
See Remarks
Exempt
Feb 15, 2026
$0.00
239
$0.00
7,766
DesRosier Thomas
See Remarks
Exempt
Feb 15, 2026
$0.00
244
$0.00
7,867
Henn Matthew R.
See Remarks
Sell
Feb 15, 2026
$753.83
89
$8.47
7,677
DesRosier Thomas
See Remarks
Sell
Feb 15, 2026
$660.66
78
$8.47
7,789
Henn Matthew R.
See Remarks
Exempt
Nov 15, 2025
$0.00
3,998
$0.00
0
DesRosier Thomas
See Remarks
Exempt
Nov 15, 2025
$0.00
132
$0.00
664
Young Teresa L.
See Remarks
Exempt
Nov 15, 2025
$0.00
3,998
$0.00
0
DesRosier Thomas
See Remarks
Exempt
Nov 15, 2025
$0.00
112
$0.00
1,001
Henn Matthew R.
See Remarks
Exempt
Nov 15, 2025
$0.00
140
$0.00
704
DesRosier Thomas
See Remarks
Exempt
Nov 15, 2025
$0.00
132
$0.00
7,587
Shaff Eric D.
Exempt
Nov 15, 2025
$0.00
390
$0.00
1,954
DesRosier Thomas
See Remarks
Exempt
Nov 15, 2025
$0.00
112
$0.00
7,699
Henn Matthew R.
See Remarks
Exempt
Nov 15, 2025
$0.00
98
$0.00
878