SERES THERAPEUTICS INC (MCRB) Institutional Ownership and Insiders Activity
SERES THERAPEUTICS INC (MCRB) is widely held by institutional investors, with 35 firms reporting positions valued at approximately $17.35M based on SEC Form 13F filings for the quarter ended June 30, 2026.
Flagship Pioneering, Llc is the largest disclosed holder, reporting approximately $9.12M in MCRB holdings in its latest filing.
Institutional ownership remains highly concentrated, with Flagship Pioneering, Llc representing the majority of disclosed value.
Recent insider activity includes 16 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.
Institutional Holders
35
Total Reported Value
$17.35M
Largest Holder
Flagship Pioneering, Llc
Largest Position
$9.12M
Insider Transactions (90d)
16
Latest Filing Quarter
Q2 2026
New Institutional Positions
0
Funds Exiting Positions
0
Top Institutional Owners
View all- Flagship Pioneering, Llc$9.12M
- Vanguard Capital Management Llc$2.27M
- Marshall Wace, Llp$1.36M
- Blackrock, Inc.$875,790
- Geode Capital Management, Llc$631,301
Related MCRB Institutional Insights:
- MCRB 13F Institutional Holders
- MCRB Superinvestors
- MCRB Institutional Ownership Changes
- Healthcare Sector Institutional Ownership
- Healthcare Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
- Most Bought Healthcare Stocks By Institutional Investors
- Most Sold Healthcare Stocks By Institutional Investors
- MCRB Insider Trading & SEC Form 4 Activity
- MCRB Articles
- Top Institutional Investor Stock Rankings