Acumen Pharmaceuticals, Inc. (ABOS)

Accumulating

Strong institutional accumulation: ownership increased +5.01% quarter-over-quarter.

Data as of Q1 2026

Institutional Ownership

63.92%

QoQ Change

+5.01%

Total Value

$106.8B

Shares Outstanding

72.2M

Crowding AnalysisCrowded

Holders84of 5,944

Avg: 68

Uncrowded86th percentileCrowded

Institutional Activity

Buy/Sell Ratio2.6x

67th percentile

52 buying20 selling

+21

New

-7

Closed

+10.5M

Net shares

Holding Period Distribution

estimate

Median: 3 QAvg: 3.2 QHolders: 84

Ownership Concentration

Top 5: 68.5%Top 10: 82.2%

RA CAPITAL MANAGEMENT, L.P.45.5%

Sands Capital Alternatives,8.1%

Alyeska Investment Group, L.P.5.3%

FRANKLIN RESOURCES5.0%

ADAR1 Capital Management,4.7%

Others (79)31.5%

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Conviction-Weighted Ownership

Median weight: 0.11%Avg weight: 0.35%Max: 2.08%High conviction (>1%): 1

RA CAPITAL MANAGEMENT, L.P.

Sands Capital Alternatives,

Alyeska Investment Group, L.P.

FRANKLIN RESOURCES

ADAR1 Capital Management,

Knollwood Investment Advisory,

VANGUARD CAPITAL MANAGEMENT

FMR

Ikarian Capital,

Hudson Bay Capital Management

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Whale Moves Timeline (8 Quarters)

Biggest dollar-value position changes among top 10 holders

BOUGHTRA CAPITAL MANAGEMENT, L.P.$14M6.1M shr

BOUGHTAlyeska Investment Group, L.P.$4M1.5M shr

NEWVANGUARD CAPITAL MANAGEMENT$4M1.5M shr

BOUGHTADAR1 Capital Management$3M1.3M shr

NEWIkarian Capital$2M1.1M shr

BOUGHTVANGUARD GROUP$5K2K shr

SOLDFMR$4K2K shr

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Institutional Trends (8 Quarters)

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Institutional Holders

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