MCRB
Seres Therapeutics, Inc.
$7.74
-0.20 (-2.52%)
At close · Jul 2
Market Cap
$74.24M
Shares
9,592,326
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 34
Total Value: $22,064,746
Total Shares: 2,487,573
Institutional Ownership Trend
5 quarters
Holder Concentration
Across 34 13F filers · Δ vs Dec 31, 2025Top Holder
46.5%
+4.3 pts
Top 5
78.6%
+4.3 pts
Top 10
92.2%
+3.7 pts
HHI
2,492
Moderately concentrated+342
Quarterly Activity
vs Dec 31, 2025
New
5
Increased
10
Decreased
9
Sold Out
9
Unchanged
10
Holder count:
-4
Institutional value:
-45.9%
Shares held:
-9.3%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega AMERICAN CENTURY COMPANIES INC | +46,045 | 62,316 | |
| Large Vontobel Holding Ltd. | +35,234 | 138,468 | |
| Large MARSHALL WACE, LLP | +19,362 | 139,539 | |
| Mega UBS Group AG | +2,804 | 7,030 | |
| Mid SIMPLEX TRADING, LLC | +1,838 | 3,070 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | −105,890 | 226,939 | |
| Mega CITADEL ADVISORS LLC | −14,748 | 59,500 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | −11,307 | 74,835 | |
| Mega TWO SIGMA INVESTMENTS, LP | −6,955 | 18,794 | |
| Mega MORGAN STANLEY | −3,426 | 21,700 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 294,143 | $2,609,048 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 39,643 | $351,633 | |
| Mega Vanguard Global Advisers, LLC | 1,975 | $17,518 | |
| Mid GROUP ONE TRADING LLC | 824 | $7,308 | |
| Mid Tower Research Capital LLC (TRC) | 794 | $7,042 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 324,214 | $4,824,303 | |
| Large Caption Management, LLC | 75,000 | $1,116,000 | |
| Mid 683 Capital Management, LLC | 52,314 | $778,432 | |
| Mega JANE STREET GROUP, LLC | 29,905 | $444,986 | |
| Large Schonfeld Strategic Advisors LLC | 29,097 | $432,963 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mid Flagship Pioneering, LLC | $10,252,389 | 46.47% | 1,155,850 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $2,609,048 | 11.82% | 294,143 | Shares | Defined | 2026-05-15 | ||||
| Large MARSHALL WACE, LLP | $1,237,710 | 5.61% | 139,539 | Shares | Other | 2026-05-15 | ||||
| Large Vontobel Holding Ltd. | $1,228,211 | 5.57% | 138,468 | Shares | Defined | 2026-05-08 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $934,356 | 4.23% | 105,339 | Shares | Other | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $904,968 | 4.10% | 102,026 | Shares | Sole | 2026-05-13 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $663,785 | 3.01% | 74,835 | Shares | Defined | 2026-05-15 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $575,663 | 2.61% | 64,900 | Put | Other | 2026-05-15 | ||||
| Mega AMERICAN CENTURY COMPANIES INC | $552,742 | 2.51% | 62,316 | Shares | Defined | 2026-05-15 | ||||
| Mega CITADEL ADVISORS LLC | $527,765 | 2.39% | 59,500 | Put | Defined | 2026-05-15 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $502,929 | 2.28% | 56,700 | Call | Other | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $351,633 | 1.59% | 39,643 | Shares | Defined | 2026-05-08 | ||||
| Mega STATE STREET CORP | $300,701 | 1.36% | 33,901 | Shares | Defined | 2026-05-15 | ||||
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $280,558 | 1.27% | 31,630 | Shares | Sole | 2026-05-15 | ||||
| Micro Lion Point Capital, LP | $280,025 | 1.27% | 31,570 | Shares | Sole | 2026-05-15 | ||||
| Mega MORGAN STANLEY | $192,478 | 0.87% | 21,700 | Shares | Defined | 2026-05-15 | ||||
| Mega TWO SIGMA INVESTMENTS, LP | $166,702 | 0.76% | 18,794 | Shares | Sole | 2026-05-15 | ||||
| Mega NORTHERN TRUST CORP Bank | $130,964 | 0.59% | 14,765 | Shares | Defined | 2026-05-14 | ||||
| Mega Invesco Ltd. | $129,031 | 0.58% | 14,547 | Shares | Defined | 2026-05-12 | ||||
| Mega UBS Group AG | $62,354 | 0.28% | 7,030 | Shares | Defined | 2026-05-05 | ||||
| Mega BARCLAYS PLC | $57,717 | 0.26% | 6,507 | Shares | Defined | 2026-05-15 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $30,885 | 0.14% | 3,482 | Shares | Defined | 2026-04-28 | ||||
| Mid SIMPLEX TRADING, LLC | $27,230 | 0.12% | 3,070 | Shares | Sole | 2026-05-14 | ||||
| Mega Vanguard Global Advisers, LLC | $17,518 | 0.08% | 1,975 | Shares | Defined | 2026-05-08 | ||||
| Mega FMR LLC | $15,540 | 0.07% | 1,752 | Shares | Defined | 2026-05-15 | ||||
| Micro Rachor Investment Advisory Services, LLC | $13,100 | 0.06% | 1,477 | Shares | Sole | 2026-05-07 | ||||
| Mid GROUP ONE TRADING LLC | $7,308 | 0.03% | 824 | Shares | Sole | 2026-05-13 | ||||
| Mid Tower Research Capital LLC (TRC) | $7,042 | 0.03% | 794 | Shares | Defined | 2026-05-15 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $1,871 | 0.01% | 211 | Shares | Defined | 2026-05-12 | ||||
| Small Physician Wealth Advisors, Inc. | $1,259 | 0.01% | 142 | Shares | Sole | 2026-04-24 | ||||
| Mega ROYAL BANK OF CANADA Bank | $948 | 0.00% | 107 | Shares | Defined | 2026-05-15 | ||||
| Mega WELLS FARGO & COMPANY/MN | $88 | 0.00% | 10 | Shares | Defined | 2026-05-11 | ||||
| Large OSAIC HOLDINGS, INC. | $70 | 0.00% | 8 | Shares | Defined | 2026-05-15 | ||||
| Mid Sound Income Strategies, LLC | $70 | 0.00% | 8 | Shares | Sole | 2026-04-27 | ||||
| Mid Arax Advisory Partners | $53 | 0.00% | 6 | Shares | Sole | 2026-05-13 | ||||
| Mid Allworth Financial LP | $35 | 0.00% | 4 | Shares | Sole | 2026-05-15 | ||||
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