Latest Period
Q2 2026
Security Snapshot
Seres Therapeutics, Inc. - COMMON STOCK (MCRB) Institutional Ownership
CUSIP: 81750R201
13F Institutional Holders and Ownership History from Q1 2025 to Q2 2026
Institutions Reporting
35
Shares (Excl. Options)
2,274,367
Price
$7.89
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- MCRB on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 2,274,367
- Total 13F value
- $17,944,705
- Portfolio coverage rank
- 0%
- Share change
- -32,090
- Value change
- -$272,343
- Number of holders
- 35
- Shares outstanding
- 8,667,871
- SEC-reported price per share
- $7.89
- Insider filing price
- $7.89
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MCRB - Seres Therapeutics, Inc. - COMMON STOCK is tracked under CUSIP 81750R201.
- 35 institutions reported positions in Q2 2026.
- 1 significant owner is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 32 to 35 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $20,458,733 to $17,944,705.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 35 institutions filings for Q2 2026.
Security key
81750R201
Latest holder period
Q2 2026
13F holders
35
13D/G owners
1
CIK / CUSIP context first
Open Q2 2026 holders
MCRB full holder history
Seres Therapeutics, Inc. SEC filings
Seres Therapeutics, Inc. company facts
Seres Therapeutics, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 81750R201:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
1
Security
MCRB
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 3.1% | -43% | $3,377,609 | -$2,827,043 | 268,704 | -46% | FMR LLC | 30 Jun 2025 |
As of 30 Jun 2026, 35 institutional investors reported holding 2,274,367 shares of Seres Therapeutics, Inc. - COMMON STOCK (MCRB). This represents 26% of the company’s total 8,667,871 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
26%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Flagship Pioneering, LLC | 13% | 1,155,850 | 0% | 0.59% | $9,119,658 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.3% | 287,776 | -2.2% | 0% | $2,270,553 |
| MARSHALL WACE, LLP | 2% | 172,245 | +23% | 0% | $1,359,016 |
| Vontobel Holding Ltd. | 1.4% | 122,975 | -11% | 0% | $970,273 |
| BlackRock, Inc. | 1.3% | 111,000 | +8.8% | 0% | $875,790 |
| GEODE CAPITAL MANAGEMENT, LLC | 0.92% | 79,974 | +6.9% | 0% | $631,301 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.67% | 58,328 | -45% | 0% | $460,208 |
| VANGUARD FIDUCIARY TRUST CO | 0.56% | 48,685 | +23% | 0% | $384,125 |
| STATE STREET CORP | 0.39% | 33,901 | 0% | 0% | $267,479 |
| Lion Point Capital, LP | 0.36% | 31,570 | 0% | 1.2% | $249,087 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.36% | 31,049 | -1.8% | 0% | $244,977 |
| AMERICAN CENTURY COMPANIES INC | 0.33% | 28,313 | -55% | 0% | $223,390 |
| XTX Topco Ltd | 0.24% | 20,732 | 0% | $163,575 | |
| GOLDMAN SACHS GROUP INC | 0.18% | 15,229 | 0% | $120,157 | |
| NORTHERN TRUST CORP | 0.17% | 14,765 | 0% | 0% | $116,496 |
| Invesco Ltd. | 0.15% | 12,974 | -11% | 0% | $102,365 |
| MORGAN STANLEY | 0.14% | 12,138 | -44% | 0% | $95,769 |
| CITADEL ADVISORS LLC | 0.12% | 10,504 | 0% | $82,877 | |
| SIMPLEX TRADING, LLC | 0.05% | 4,598 | +50% | 0% | $36,278 |
| SBI Securities Co., Ltd. | 0.05% | 4,182 | +20% | 0% | $32,996 |
| Integrated Wealth Concepts LLC | 0.05% | 4,000 | 0% | $31,560 | |
| GROUP ONE TRADING LLC | 0.04% | 3,714 | +351% | 0% | $29,303 |
| JPMORGAN CHASE & CO | 0.04% | 3,636 | 0% | $28,325 | |
| Vanguard Global Advisers, LLC | 0.02% | 1,975 | 0% | 0% | $15,583 |
| FMR LLC | 0.02% | 1,528 | -13% | 0% | $12,056 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
6
Latest
Q2 2026
Rows shown
1-6 of 6
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 2,274,367 | $17,944,705 | -$272,343 | $7.89 | 35 |
| 2026 Q1 | 2,306,457 | $20,458,733 | -$2,224,292 | $8.87 | 32 |
| 2025 Q4 | 2,441,565 | $36,368,373 | +$4,536,402 | $14.88 | 35 |
| 2025 Q3 | 2,125,842 | $40,902,370 | -$2,393,659 | $19.24 | 32 |
| 2025 Q2 | 2,284,946 | $25,385,817 | +$24,555,434 | $11.11 | 33 |
| 2025 Q1 | 145,407 | $101,799 | +$101,799 | $0.70 | 4 |