MCRB — Seres Therapeutics Inc Institutional Holders · Q2 2026

Name: Who Owns MCRB? 38 Institutions Hold $19.2M (Q2 2026)
Creator: ko.io

Who owns Seres Therapeutics Inc (MCRB)? 38 institutions reported holding $19.25M in SEC 13F filings for Q2 2026 (period ended 2026-06-30). Largest holders: Flagship Pioneering Inc. ($9.1M), Vanguard Group Inc ($2.7M), Marshall Wace, LLP ($1.4M).

Rank	Institution	Value	Shares	Change
1	Flagship Pioneering Inc.	$9.1M	1.2M	Hold
2	VANGUARD GROUP INC	$2.7M	338,436	Added
3	MARSHALL WACE, LLP	$1.4M	172,245	Added
4	SUSQUEHANNA INTERNATIONAL GROUP, LLP	$1.1M	133,228	Trimmed
5	Vontobel Holding Ltd.	$970,273	122,975	Trimmed
6	BlackRock, Inc.	$875,790	111,000	Added
7	GEODE CAPITAL MANAGEMENT, LLC	$631,301	79,974	Added
8	CITADEL ADVISORS LLC	$426,092	54,004	Trimmed
9	STATE STREET CORP	$267,479	33,901	Hold
10	Lion Point Capital, LP	$249,087	31,570	Hold
11	GROUP ONE TRADING LLC	$245,489	31,114	Trimmed
12	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	$244,977	31,049	Trimmed
13	AMERICAN CENTURY COMPANIES INC	$223,390	28,313	Trimmed
14	SIMPLEX TRADING, LLC	$221,692	28,098	Added
15	XTX Topco Ltd	$163,575	20,732	New
16	GOLDMAN SACHS GROUP INC	$120,157	15,229	New
17	NORTHERN TRUST CORP	$116,496	14,765	Hold
18	Invesco Ltd.	$102,365	12,974	Trimmed
19	MORGAN STANLEY	$95,769	12,138	Trimmed
20	SBI Securities Co., Ltd.	$32,996	4,182	Added
21	JPMORGAN CHASE & CO	$28,325	3,636	New
22	FMR LLC	$12,056	1,528	Trimmed
23	Rachor Investment Advisory Services, LLC	$11,654	1,477	Hold
24	UBS Group AG	$3,818	484	Trimmed
25	Tower Research Capital LLC (TRC)	$2,493	316	Trimmed

Source: SEC Form 13F filings · as of 2026-06-30