Seres Therapeutics, Inc.
Total Trades
91
Buys
1
Sells
45
Largest Trade
N/A
Insiders
10
Institutional Funds
24
Inst. Value
$1M+
Activist Filings
23
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Shaff Eric D. | Director | EXERCISE | N/A | 723 | — | Feb 18, 2026 |
| Shaff Eric D. | Director | SELL | $1K–$15K | 259 | $8.47 | Feb 18, 2026 |
| Young Teresa L. | See Remarks | SELL | <$1K | 75 | $8.47 | Feb 18, 2026 |
| Young Teresa L. | See Remarks | EXERCISE | N/A | 231 | — | Feb 18, 2026 |
| DesRosier Thomas | See Remarks | SELL | <$1K | 78 | $8.47 | Feb 18, 2026 |
| DesRosier Thomas | See Remarks | EXERCISE | N/A | 244 | — | Feb 18, 2026 |
| Henn Matthew R | See Remarks | EXERCISE | N/A | 239 | — | Feb 18, 2026 |
| Henn Matthew R | See Remarks | SELL | <$1K | 89 | $8.47 | Feb 18, 2026 |
| Young Teresa L. | See Remarks | SELL | $15K–$50K | 1K | $17.30 | Nov 18, 2025 |
| Young Teresa L. | See Remarks | EXERCISE | N/A | 4K | — | Nov 18, 2025 |
| Shaff Eric D. | Director | SELL | $1K–$15K | 217 | $17.30 | Nov 18, 2025 |
| Shaff Eric D. | Director | EXERCISE | N/A | 721 | — | Nov 18, 2025 |
| DesRosier Thomas | See Remarks | SELL | $1K–$15K | 76 | $17.30 | Nov 18, 2025 |
| DesRosier Thomas | See Remarks | EXERCISE | N/A | 244 | — | Nov 18, 2025 |
| Henn Matthew R | See Remarks | EXERCISE | N/A | 4K | — | Nov 18, 2025 |
| Henn Matthew R | See Remarks | SELL | $15K–$50K | 1K | $17.30 | Nov 18, 2025 |
| Young Teresa L. | See Remarks | SELL | <$1K | 63 | $7.28 | May 19, 2025 |
| Young Teresa L. | See Remarks | EXERCISE | N/A | 231 | — | May 19, 2025 |
| Shaff Eric D. | CEO and President | SELL | $1K–$15K | 220 | $7.28 | May 19, 2025 |
| Shaff Eric D. | CEO and President | EXERCISE | N/A | 721 | — | May 19, 2025 |
| DesRosier Thomas | Chief Legal Office… | SELL | <$1K | 79 | $7.28 | May 19, 2025 |
| DesRosier Thomas | Chief Legal Office… | EXERCISE | N/A | 244 | — | May 19, 2025 |
| Henn Matthew R | See Remarks | EXERCISE | N/A | 238 | — | May 19, 2025 |
| Henn Matthew R | See Remarks | SELL | <$1K | 77 | $7.28 | May 19, 2025 |
| DesRosier Thomas | Chief Legal Office… | SELL | <$1K | 878 | $0.54 | Nov 19, 2024 |
| DesRosier Thomas | Chief Legal Office… | EXERCISE | N/A | 3K | — | Nov 19, 2024 |
| von Moltke Lisa | See Remarks | EXERCISE | N/A | 3K | — | Nov 19, 2024 |
| von Moltke Lisa | See Remarks | SELL | <$1K | 977 | $0.54 | Nov 19, 2024 |
| Young Teresa L. | See Remarks | SELL | <$1K | 735 | $0.54 | Nov 19, 2024 |
| Young Teresa L. | See Remarks | EXERCISE | N/A | 3K | — | Nov 19, 2024 |
| Shaff Eric D. | CEO and President | SELL | $1K–$15K | 3K | $0.54 | Nov 19, 2024 |
| Shaff Eric D. | CEO and President | EXERCISE | N/A | 8K | — | Nov 19, 2024 |
| Henn Matthew R. | See Remarks | EXERCISE | N/A | 3K | — | Nov 19, 2024 |
| Henn Matthew R. | See Remarks | SELL | <$1K | 927 | $0.54 | Nov 19, 2024 |
| von Moltke Lisa | See Remarks | EXERCISE | N/A | 14K | — | Oct 29, 2024 |
| von Moltke Lisa | See Remarks | SELL | $1K–$15K | 4K | $0.69 | Oct 29, 2024 |
| Henn Matthew R. | See Remarks | SELL | $1K–$15K | 4K | $0.69 | Oct 29, 2024 |
| Henn Matthew R. | See Remarks | EXERCISE | N/A | 13K | — | Oct 29, 2024 |
| DesRosier Thomas | Chief Legal Office… | SELL | $1K–$15K | 4K | $0.69 | Oct 29, 2024 |
| DesRosier Thomas | Chief Legal Office… | EXERCISE | N/A | 14K | — | Oct 29, 2024 |
| Shaff Eric D. | CEO and President | EXERCISE | N/A | 28K | — | Oct 29, 2024 |
| Shaff Eric D. | CEO and President | SELL | $1K–$15K | 9K | $0.69 | Oct 29, 2024 |
| Young Teresa L. | See Remarks | EXERCISE | N/A | 11K | — | Oct 29, 2024 |
| Young Teresa L. | See Remarks | SELL | $1K–$15K | 3K | $0.69 | Oct 29, 2024 |
| DesRosier Thomas | Chief Legal Office… | EXERCISE | N/A | 3K | — | Aug 19, 2024 |
| DesRosier Thomas | Chief Legal Office… | SELL | <$1K | 873 | $0.84 | Aug 19, 2024 |
| von Moltke Lisa | See Remarks | SELL | <$1K | 973 | $0.84 | Aug 19, 2024 |
| von Moltke Lisa | See Remarks | EXERCISE | N/A | 3K | — | Aug 19, 2024 |
| Henn Matthew R. | See Remarks | EXERCISE | N/A | 3K | — | Aug 19, 2024 |
| Henn Matthew R. | See Remarks | SELL | <$1K | 923 | $0.84 | Aug 19, 2024 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 24 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| VANGUARD GROUP INC | 283K | $1M+ | SH |
| Vontobel Holding Ltd. | 103K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 72K | $1M+ | SH |
| STATE STREET CORP | 34K | $500K+ | SH |
| Lion Point Capital, LP | 32K | $100K–$500K | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 31K | $100K–$500K | SH |
| JANE STREET GROUP, LLC | 30K | $100K–$500K | SH (Call) |
| Schonfeld Strategic Advisors LLC | 29K | $100K–$500K | SH |
| MARSHALL WACE, LLP | 18K | $100K–$500K | SH |
| AMERICAN CENTURY COMPANIES INC | 16K | $100K–$500K | SH |
| OMERS ADMINISTRATION Corp | 14K | $100K–$500K | SH |
| GOLDMAN SACHS GROUP INC | 14K | $100K–$500K | SH |
| MORGAN STANLEY | 13K | $100K–$500K | SH |
| BARCLAYS PLC | 7K | $100K–$500K | SH |
| SBI Securities Co., Ltd. | 3K | $50K–$100K | SH |
| Rachor Investment Advisory Services, LLC | 1K | $15K–$50K | SH |
| SIMPLEX TRADING, LLC | 1K | $15K–$50K | SH |
| BNP PARIBAS FINANCIAL MARKETS | 773 | $1K–$15K | SH |
| UBS Group AG | 333 | $1K–$15K | SH |
| WELLS FARGO & COMPANY/MN | 260 | $1K–$15K | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Aug 6, 2025
3.1%
269K shares
SC 13G/A · Jun 6, 2025
5.7%
494K shares
SC 13G/A · Feb 12, 2025
12.8%
21.8M shares
SC 13D/A · Oct 2, 2024
14.3%
2.2B shares
SC 13G/A · Apr 5, 2024
4.5%
6.8M shares
Janus Henderson Group plc EIN #00-0000000
SC 13G/A · Feb 12, 2024
0.0%
483 shares
SC 13G · Jan 29, 2024
5.7%
7.3M shares
SC 13G/A · Nov 7, 2023
4.0%
5.2M shares
SC 13G/A · May 10, 2023
9.0%
11.5M shares
SC 13G/A · Apr 6, 2023
5.0%
6.2M shares
Janus Henderson Group plc EIN #00-0000000
SC 13G/A · Feb 10, 2023
9.0%
11.2M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G/A · Feb 3, 2023
3.7%
0 shares
SC 13G · Feb 3, 2023
5.2%
6.5M shares
SC 13G/A · Feb 1, 2023
14.5%
18.1M shares
SC 13G/A · Aug 9, 2022
4.7%
5.9M shares
Nestle Health Science US Holdings, Inc.
SC 13D/A · Jul 22, 2022
0.0%
0 shares
(entities only Federated Hermes, Inc.
SC 13G/A · Jul 11, 2022
14.5%
18.0M shares
SC 13D/A · Jul 7, 2022
2.2%
2.7M shares
SC 13G/A · Feb 14, 2022
0.0%
0 shares
(entities only Federated Hermes, Inc.
SC 13G · Feb 14, 2022
7.5%
6.9M shares
Nikko Asset Management Americas, Inc.
SC 13G/A · Feb 14, 2022
0.9%
786K shares
Janus Henderson Group plc EIN #00-0000000
SC 13G · Feb 11, 2022
5.5%
5.1M shares
STATE STREET CORPORATION I.R.S. IDENTIFICATION NO. OF THE ABOVE PERSON 04-2456637
SC 13G/A · Jan 10, 2022
5.2%
0 shares