Seres Therapeutics, Inc. (MCRB)

Distributing

Strong institutional distribution: ownership decreased -4.38% quarter-over-quarter.

Data as of Q1 2026

Institutional Ownership

25.93%

QoQ Change

-4.38%

Total Value

$22.0B

Shares Outstanding

9.6M

Crowding AnalysisCrowded

Holders33of 5,944

Avg: 68

Uncrowded79th percentileCrowded

Institutional Activity

Buy/Sell Ratio0.83x

51th percentile

15 buying18 selling

New

-9

Closed

-254,636

Net shares

Holding Period Distribution

estimate

Median: 3 QAvg: 2.6 QHolders: 33

Ownership Concentration

Top 5: 78.7%Top 10: 92.3%

Flagship Pioneering,46.5%

VANGUARD CAPITAL MANAGEMENT11.8%

SUSQUEHANNA INTERNATIONAL GROUP, LLP9.1%

MARSHALL WACE, LLP5.6%

Vontobel Holding5.6%

Others (28)21.3%

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Conviction-Weighted Ownership

Median weight: 0.00%Avg weight: 0.09%Max: 0.88%High conviction (>1%): 0

Flagship Pioneering,

VANGUARD CAPITAL MANAGEMENT

SUSQUEHANNA INTERNATIONAL GROUP, LLP

MARSHALL WACE, LLP

Vontobel Holding

BlackRock,

GEODE CAPITAL MANAGEMENT,

AMERICAN CENTURY COMPANIES

CITADEL ADVISORS

VANGUARD FIDUCIARY TRUST

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Whale Moves Timeline (4 Quarters)

Biggest dollar-value position changes among top 10 holders

NEWVANGUARD CAPITAL MANAGEMENT$3M294K shr

SOLDSUSQUEHANNA INTERNATIONAL GROUP, LLP$939K106K shr

NEWAMERICAN CENTURY COMPANIES$553K62K shr

NEWVANGUARD FIDUCIARY TRUST$352K40K shr

BOUGHTVontobel Holding$313K35K shr

NEWGEODE CAPITAL MANAGEMENT$1M86K shr

NEWCaption Management$1M75K shr

SOLDSUSQUEHANNA INTERNATIONAL GROUP, LLP$894K60K shr

NEW683 Capital Management$778K52K shr

BOUGHTVANGUARD GROUP$183K12K shr

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Institutional Trends (8 Quarters)

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Institutional Holders

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