Alector, Inc. (ALEC)

Accumulating

Institutional accumulation: ownership increased +2.16% quarter-over-quarter.

Data as of Q1 2026

Institutional Ownership

79.55%

QoQ Change

+2.16%

Total Value

$180.9B

Shares Outstanding

111.0M

Crowding AnalysisCrowded

Holders134of 5,944

Avg: 68

Uncrowded89th percentileCrowded

Institutional Activity

Buy/Sell Ratio1.26x

72th percentile

73 buying58 selling

+29

New

-22

Closed

+3.8M

Net shares

Holding Period Distribution

estimate

Median: 3 QAvg: 3.1 QHolders: 134

Ownership Concentration

Top 5: 33.2%Top 10: 51.1%

TCG Crossover Management,11.3%

BlackRock,8.8%

ACADIAN ASSET MANAGEMENT4.6%

Foresite Capital Management IV,4.4%

VANGUARD CAPITAL MANAGEMENT4.2%

Others (129)66.8%

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Conviction-Weighted Ownership

Median weight: 0.12%Avg weight: 0.69%Max: 3.53%High conviction (>1%): 2

TCG Crossover Management,

BlackRock,

ACADIAN ASSET MANAGEMENT

Foresite Capital Management IV,

VANGUARD CAPITAL MANAGEMENT

Merck & Co.,

D. E. Shaw & Co.,

683 Capital Management,

BALYASNY ASSET MANAGEMENT L.P.

Nantahala Capital Management,

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Whale Moves Timeline (8 Quarters)

Biggest dollar-value position changes among top 10 holders

NEWVANGUARD CAPITAL MANAGEMENT$8M3.7M shr

NEWNantahala Capital Management$6M2.8M shr

BOUGHTD. E. Shaw & Co.$2M968K shr

BOUGHTBlackRock$1M593K shr

SOLDBALYASNY ASSET MANAGEMENT L.P.$710K330K shr

BOUGHTACADIAN ASSET MANAGEMENT$1.7B1.1M shr

SOLDFMR$20M13.0M shr

NEWTCG Crossover Management$16M10.0M shr

NEWForesite Capital Management IV$6M3.9M shr

NEW683 Capital Management$5M3.4M shr

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Institutional Trends (8 Quarters)

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Institutional Holders

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