Security key
81750R201
Seres Therapeutics, Inc. - COMMON STOCK (MCRB)
CUSIP: 81750R201
Q1 2025 13F Holders as of 31 Mar 2025
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 145,407
- Total 13F value
- $101,799
- Share change
- +145,407
- SEC-reported price per share
- $0.70
- Number of holders
- 4
- Value change
- +$101,799
- Number of buys
- 4
- Shares outstanding
- 8,667,871
Holder snapshot
5 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2025
Institutions
4
Top holders
4
MCRB full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2025
Seres Therapeutics, Inc. SEC filings
Seres Therapeutics, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 81750R201
Recent filing periods:
Ownership snapshot
Top reported holders of MCRB - Seres Therapeutics, 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
FMR LLC
Disclosed value leader
Flagship Pioneering, LLC
Comparable rows
15/15
Latest evidence
31 Dec 2024
13F
13D/G
Lead comparable stake: 13%
13D/G row: FMR LLC
Showing 1-6 of 15 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 13%.
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 FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
13%
Flagship Pioneering, LLC
14%
VANGUARD GROUP INC
3.4%
MORGAN STANLEY
1.2%
MILLENNIUM MANAGEMENT LLC
1.1%
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 |
|---|---|---|---|---|---|
| FMR LLC |
13F
13D/G
Company
|
13%
from 13D/G
|
$18,125,520
21,811,697 shares
|
— | 31 Dec 2024 |
| Flagship Pioneering, LLC |
13F
Company
|
14%
|
$19,251,994
23,117,045 shares
|
— | 31 Dec 2024 |
| VANGUARD GROUP INC |
13F
Company
|
3.4%
|
$4,881,194
5,873,880 shares
|
— | 31 Dec 2024 |
| MORGAN STANLEY |
13F
Company
|
1.2%
|
$1,673,011
2,013,251 shares
|
— | 31 Dec 2024 |
| MILLENNIUM MANAGEMENT LLC |
13F
Company
|
1.1%
|
$1,504,707
1,810,719 shares
|
— | 31 Dec 2024 |
| BlackRock, Inc. |
13F
Company
|
1%
|
$1,464,352
1,762,157 shares
|
— | 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 Q1 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
4
Shares
145,407
Rows available
4
| 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 2025 vs Q4 2025 Across Filers
Q4 2025 holders
35
Q1 2025 holders
4
Holder diff
-31
| Investor | Q4 2025 Shares | Q1 2025 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend