SERES THERAPEUTICS INC (MCRB)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
Institutions report 2,349,869 shares against 9,941,261 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Flagship Pioneering, LLC | $9.1M | 1,155,850 | 0.59% | 5q | HELD |
| VANGUARD CAPITAL MANAGEMENT LLC | $2.3M | 287,776 | 0.00% | 2q | -2.2%-$50.2K |
| MARSHALL WACE, LLP | $1.4M | 172,245 | 0.00% | 5q | +23.4%+$258.1K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.1M | 58,328 | 0.00% | 5q | -44.6%-$847.2K |
| Vontobel Holding Ltd. | $970.3K | 122,975 | 0.00% | 5q | -11.2%-$122.2K |
| BlackRock, Inc. | $875.8K | 111,000 | 0.00% | 5q | +8.8%+$70.8K |
| CITADEL ADVISORS LLC | $852.2K | 21,008 | 0.00% | 5q | HELD |
| GEODE CAPITAL MANAGEMENT, LLC | $631.3K | 79,974 | 0.00% | 5q | +6.9%+$40.6K |
| STATE STREET CORP | $535.0K | 67,802 | 0.00% | 5q | +100.0%+$267.5K |
| VANGUARD FIDUCIARY TRUST CO | $384.1K | 48,685 | 0.00% | 2q | +22.8%+$71.3K |
| Lion Point Capital, LP | $249.1K | 31,570 | 1.19% | 5q | HELD |
| GROUP ONE TRADING LLC | $245.5K | 3,714 | 0.00% | 5q | +350.7%+$191.0K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $245.0K | 31,049 | 0.00% | 5q | -1.8%-$4.6K |
| Sixth Street Partners Management Company, L.P. | $245.0K | 31,049 | 0.00% | new | NEW |
| AMERICAN CENTURY COMPANIES INC | $223.4K | 28,313 | 0.00% | 3q | -54.6%-$268.3K |
| SIMPLEX TRADING, LLC | $221.7K | 4,598 | 0.00% | 5q | +49.8%+$73.7K |
| XTX Topco Ltd | $163.6K | 20,732 | 0.00% | new | NEW |
| GOLDMAN SACHS GROUP INC | $120.2K | 15,229 | 0.00% | new | NEW |
| NORTHERN TRUST CORP | $116.5K | 14,765 | 0.00% | 5q | HELD |
| Invesco Ltd. | $102.4K | 12,974 | 0.00% | 4q | -10.8%-$12.4K |
| MORGAN STANLEY | $95.8K | 12,138 | 0.00% | 5q | -44.1%-$75.4K |
| SBI Securities Co., Ltd. | $33.0K | 4,182 | 0.00% | 6q | +20.1%+$5.5K |
| Integrated Wealth Concepts LLC | $31.6K | 4,000 | 0.00% | new | NEW |
| JPMORGAN CHASE & CO | $28.3K | 3,636 | 0.00% | new | NEW |
| Vanguard Global Advisers, LLC | $15.6K | 1,975 | 0.00% | 2q | HELD |
| FMR LLC | $12.1K | 1,528 | 0.00% | 5q | -12.8%-$1.8K |
| Rachor Investment Advisory Services, LLC | $11.7K | 1,477 | 0.01% | 3q | HELD |
| UBS Group AG | $3.8K | 484 | 0.00% | 5q | -93.1%-$51.6K |
| Tower Research Capital LLC (TRC) | $2.5K | 316 | 0.00% | 2q | -60.2%-$3.8K |
| BNP PARIBAS FINANCIAL MARKETS | $1.7K | 211 | 0.00% | 5q | HELD |
| BARCLAYS PLC | $1.3K | 167 | 0.00% | 4q | -97.4%-$50.0K |
| Continuum Advisory, LLC | $371 | 47 | 0.00% | new | NEW |
| MERCER GLOBAL ADVISORS INC /ADV | $292 | 37 | 0.00% | new | NEW |
| WELLS FARGO & COMPANY/MN | $79 | 10 | 0.00% | 5q | -50.0% |
| OSAIC HOLDINGS, INC. | $63 | 8 | 0.00% | 5q | HELD |
| Larson Financial Group LLC | $39 | 5 | 0.00% | new | NEW |
| WHITTIER TRUST CO OF NEVADA INC | $8 | 1 | 0.00% | new | NEW |
| ROYAL BANK OF CANADA | $0 | 11 | 0.00% | 2q | -88.7% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 38 | $20.2M | 2,349,869 | 9 | 8 | 13 | 8.3% |
| Q1 2026 | 34 | $22.8M | 2,306,473 | 3 | 9 | 9 | 10.1% |
| Q4 2025 | 39 | $45.4M | 2,504,465 | 8 | 14 | 5 | 19.9% |
| Q3 2025 | 41 | $60.9M | 2,125,907 | 14 | 11 | 8 | 32.9% |
| Q2 2025 | 36 | $27.9M | 2,291,892 | 38 | 0 | 1 | 8.9% |
| Q1 2025 | 65 | $43.2M | 61,502,372 | 9 | 14 | 14 | 0.4% |
| Q4 2024 | 70 | $55.5M | 63,076,408 | 8 | 17 | 19 | 5.5% |
| Q3 2024 | 77 | $61.9M | 63,497,572 | 9 | 16 | 26 | 2.9% |
| Q2 2024 | 93 | $50.8M | 69,132,735 | 20 | 23 | 29 | 1.6% |
| Q1 2024 | 98 | $68.4M | 86,770,814 | 18 | 27 | 28 | 1.3% |
| Q4 2023 | 103 | $127.7M | 90,468,058 | 16 | 25 | 41 | 0.8% |
| Q3 2023 | 136 | $268.1M | 109,395,583 | 19 | 51 | 30 | 2.9% |
| Q2 2023 | 140 | $555.2M | 112,328,631 | 36 | 58 | 26 | 3.1% |
| Q1 2023 | 125 | $707.4M | 123,976,659 | 20 | 40 | 35 | 0.6% |
| Q4 2022 | 124 | $591.3M | 105,075,203 | 21 | 38 | 33 | 0.5% |
| Q3 2022 | 122 | $746.9M | 115,895,160 | 21 | 48 | 29 | 0.5% |
| Q2 2022 | 124 | $314.1M | 90,888,400 | 18 | 31 | 48 | 0.5% |
| Q1 2022 | 132 | $542.4M | 75,454,521 | 6 | 41 | 51 | 0.9% |
| Q4 2021 | 151 | $659.9M | 78,068,823 | 31 | 43 | 41 | 1.5% |
| Q3 2021 | 134 | $562.6M | 79,613,237 | 27 | 47 | 33 | 1.3% |
| Q2 2021 | 148 | $2.0B | 81,298,412 | 19 | 56 | 46 | 2.7% |
| Q1 2021 | 155 | $1.9B | 89,997,684 | 26 | 58 | 45 | 2.1% |
| Q4 2020 | 156 | $2.2B | 86,807,137 | 50 | 49 | 34 | 1.5% |
| Q3 2020 | 121 | $2.5B | 86,072,268 | 41 | 40 | 29 | 4.1% |
| Q2 2020 | 98 | $349.4M | 71,992,490 | 30 | 40 | 16 | 2.0% |
| Q1 2020 | 76 | $272.1M | 76,253,478 | 10 | 26 | 25 | 0.0% |
| Q4 2019 | 76 | $230.1M | 66,668,343 | 10 | 36 | 16 | 0.1% |
| Q3 2019 | 78 | $259.3M | 64,315,570 | 10 | 34 | 18 | 0.5% |
| Q2 2019 | 88 | $203.9M | 62,013,303 | 26 | 33 | 13 | 2.2% |
| Q1 2019 | 82 | $232.8M | 33,830,263 | 16 | 29 | 17 | 0.1% |
| Q4 2018 | 70 | $144.5M | 31,944,080 | 1 | 0 | 2 | 0.1% |