Dyne Therapeutics, Inc. (DYN)

Highly Crowded

Held by 218 of 5,944 reporting institutions (92th percentile) — extremely crowded.

Data as of Q1 2026

Institutional Ownership

100.00%

QoQ Change

+5.68%

Total Value

$2.8T

Shares Outstanding

165.2M

Crowding AnalysisHighly Crowded

Holders218of 5,944

Avg: 68

Uncrowded92th percentileCrowded

Institutional Activity

Buy/Sell Ratio1.32x

83th percentile

141 buying107 selling

+42

New

-46

Closed

+9.6M

Net shares

Holding Period Distribution

estimate

Median: 3 QAvg: 3 QHolders: 218

Ownership Concentration

Top 5: 40.0%Top 10: 55.8%

T. Rowe Price Investment Management,16.6%

JANUS HENDERSON GROUP7.4%

BlackRock,6.3%

Atlas Venture Life Science Advisors,4.9%

FMR4.8%

Others (213)60.0%

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Conviction-Weighted Ownership

Median weight: 0.25%Avg weight: 3.53%Max: 20.95%High conviction (>1%): 3

T. Rowe Price Investment Management,

JANUS HENDERSON GROUP

BlackRock,

Atlas Venture Life Science Advisors,

FMR

Orbis Allan Gray

STATE STREET

VANGUARD CAPITAL MANAGEMENT

PERCEPTIVE ADVISORS

FCPM III SERVICES B.V.

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Whale Moves Timeline (8 Quarters)

Biggest dollar-value position changes among top 10 holders

NEWVANGUARD CAPITAL MANAGEMENT$116M6.4M shr

NEWPERCEPTIVE ADVISORS$85M4.7M shr

BOUGHTFMR$42M2.3M shr

BOUGHTOrbis Allan Gray$36M2.0M shr

SOLDFCPM III SERVICES B.V.$15M818K shr

NEWOrbis Allan Gray$94M4.8M shr

BOUGHTADAGE CAPITAL PARTNERS GP, L.L.C.$32M1.6M shr

BOUGHTBlackRock$30M1.6M shr

BOUGHTVANGUARD GROUP$28M1.5M shr

BOUGHTSTATE STREET$28M1.4M shr

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Institutional Trends (8 Quarters)

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Institutional Holders

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