Security key
81750R102
Seres Therapeutics, Inc. - COMMON STOCK (MCRB)
CUSIP: 81750R102
Q1 2023 13F Holders as of 31 Mar 2023
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 104,749,292
- Total 13F value
- $593,914,430
- Share change
- -392,010
- Put/Call ratio
- 98%
- SEC-reported price per share
- $5.67
- Number of holders
- 123
- Value change
- -$2,181,787
- Number of buys
- 59
- Number of sells
- 56
- Shares outstanding
- 170,403,883
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2023
Institutions
123
Top holders
10
MCRB full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2025
Seres Therapeutics, Inc. SEC filings
Seres Therapeutics, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 81750R102
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
Nutritional Health LTP Fu...
Disclosed value leader
Flagship Pioneering, LLC
Comparable rows
0/15
Latest evidence
31 Dec 2022
3/4/5
13F
Highest disclosed value: $129,455,452
15 rows are not safely comparable across share classes.
Showing 1-6 of 15 holder rows.
Quick read
Flagship Pioneering, LLC has the largest disclosed position value at $129.46M.
0 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 Flagship Pioneering, LLC's linked filing trail.
Disclosed position value
Top 5
Nutritional Health LTP Fund Gener...
$31.72M
Flagship Pioneering Fund VII Gene...
$7.86M
Flagship Pioneering, LLC
$129.46M
FMR LLC
$104.66M
FEDERATED HERMES, INC.
$101.28M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Nutritional Health LTP Fund General Partner LLC |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$31,715,635
23,493,063 shares
|
— | 05 Jul 2022 |
| Flagship Pioneering Fund VII General Partner LLC |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$7,864,418
5,825,495 shares
|
— | 05 Jul 2022 |
| Flagship Pioneering, LLC |
13F
Company
|
—
denominator unverified
|
$129,455,452
23,117,045 shares
|
— | 31 Dec 2022 |
| FMR LLC |
13F
Company
|
—
denominator unverified
|
$104,657,061
18,688,761 shares
|
— | 31 Dec 2022 |
| FEDERATED HERMES, INC. |
13F
Company
|
—
denominator unverified
|
$101,281,253
18,085,938 shares
|
— | 31 Dec 2022 |
| Janus Henderson Group Ltd. |
13F
Company
|
—
denominator unverified
|
$63,001,442
11,248,292 shares
|
— | 31 Dec 2022 |
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 2023
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
123
Shares
104,749,292
Rows available
123
| 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 2023 vs Q3 2025 Across Filers
Q3 2025 holders
1
Q1 2023 holders
123
Holder diff
122
| Investor | Q3 2025 Shares | Q1 2023 Shares | Share Diff | Share Chg % | Q3 2025 value | Q1 2023 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend