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Public ownership evidence

Seres Therapeutics, Inc. (MCRB) Ownership Disclosures

Read MCRB insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-14T23:32:50.005Z

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2026-08-192026-08-17Brady KellyS64Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-08-17 and its public availability date is 2026-08-19. Subtracting those calendar dates gives 2 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code S: a sale. A purchase-following rule excludes this sale even if the reported dollar amount is large.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001193125-26-355734 ↗SEC 0001193125-26-355722 ↗SEC 0001193125-26-355718 ↗

Recent Form 4 activity

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2026-08-192026-08-17Brady KellyS64Not reported
2026-08-192026-08-17Shaff Eric D.S263Not reported
2026-08-192026-08-17Henn Matthew RS81Not reported
2026-08-192026-08-17DesRosier ThomasS82Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

Inspect all 50 displayed rows: Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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XTX Topco Ltd2026-06-302026-08-1520,732$163,575None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-1531,049$244,977None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-1531,049$244,977None
OSAIC HOLDINGS, INC.2026-06-302026-08-158$63None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1511,100$87,579Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1563,800$503,382Put
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1558,328$460,208None
Flagship Pioneering, LLC2026-06-302026-08-15733,207$5,785,004None
Flagship Pioneering, LLC2026-06-302026-08-15422,643$3,334,654None
CITADEL ADVISORS LLC2026-06-302026-08-1543,500$343,215Put
CITADEL ADVISORS LLC2026-06-302026-08-1510,504$82,877None
Larson Financial Group LLC2026-06-302026-08-155$39None
Lion Point Capital, LP2026-06-302026-08-1531,570$249,087None
GROUP ONE TRADING LLC2026-06-302026-08-153,714$29,303None
Invesco Ltd.2026-06-302026-08-1512,974$102,365None
GOLDMAN SACHS GROUP INC2026-06-302026-08-1515,229$120,157None
BARCLAYS PLC2026-06-302026-08-15167$1,318None
WELLS FARGO & COMPANY/MN2026-06-302026-08-1510$79None
VANGUARD CAPITAL MANAGEMENT LLC2026-06-302026-08-14287,776$2,270,553None
Vanguard Global Advisers, LLC2026-06-302026-08-141,975$15,583None
UBS Group AG2026-06-302026-08-148$63None
UBS Group AG2026-06-302026-08-1435$276None
UBS Group AG2026-06-302026-08-14108$852None
UBS Group AG2026-06-302026-08-14333$2,627None
MARSHALL WACE, LLP2026-06-302026-08-14144,665$1,141,410None
MARSHALL WACE, LLP2026-06-302026-08-1427,580$217,606None
BNP PARIBAS FINANCIAL MARKETS2026-06-302026-08-14211$1,665None
VANGUARD FIDUCIARY TRUST CO2026-06-302026-08-1448,685$384,125None
MORGAN STANLEY2026-06-302026-08-1411,911$93,978None
MORGAN STANLEY2026-06-302026-08-14121$955None
MORGAN STANLEY2026-06-302026-08-14106$836None
FMR LLC2026-06-302026-08-141,430$11,283None
FMR LLC2026-06-302026-08-1498$773None
NORTHERN TRUST CORP2026-06-302026-08-1414,754$116,409None
NORTHERN TRUST CORP2026-06-302026-08-1411$87None
Integrated Wealth Concepts LLC2026-06-302026-08-134,000$31,560None
SIMPLEX TRADING, LLC2026-06-302026-08-134,598$36,278None
GEODE CAPITAL MANAGEMENT, LLC2026-06-302026-08-1315,004$118,381None
GEODE CAPITAL MANAGEMENT, LLC2026-06-302026-08-1364,970$512,920None
AMERICAN CENTURY COMPANIES INC2026-06-302026-08-1328,313$223,390None
JPMORGAN CHASE & CO2026-06-302026-08-13320$2,493None
JPMORGAN CHASE & CO2026-06-302026-08-133,316$25,832None
Tower Research Capital LLC (TRC)2026-06-302026-08-12316$2,493None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-1237$292None
BlackRock, Inc.2026-06-302026-08-0883,913$662,074None
BlackRock, Inc.2026-06-302026-08-0825,389$200,319None
BlackRock, Inc.2026-06-302026-08-081,698$13,397None
STATE STREET CORP2026-06-302026-08-0833,901$267,479None
Continuum Advisory, LLC2026-06-302026-08-0747$371None
Vontobel Holding Ltd.2026-06-302026-08-04122,975$970,273None

90-day public filing window, up to 50 source positions.

XTX Topco Ltd ↗CHARLES SCHWAB INVESTMENT MANAGEMENT INC ↗Sixth Street Partners Management Company, L.P. ↗OSAIC HOLDINGS, INC. ↗SUSQUEHANNA INTERNATIONAL GROUP, LLP ↗SUSQUEHANNA INTERNATIONAL GROUP, LLP ↗SUSQUEHANNA INTERNATIONAL GROUP, LLP ↗Flagship Pioneering, LLC ↗Flagship Pioneering, LLC ↗CITADEL ADVISORS LLC ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.