Alumis Inc. Common Stock (ALMS)

Highly Crowded

Held by 192 of 5,944 reporting institutions (91th percentile) — extremely crowded.

Data as of Q1 2026

Institutional Ownership

78.71%

QoQ Change

-14.69%

Total Value

$2.1T

Shares Outstanding

127.5M

Crowding AnalysisHighly Crowded

Holders192of 5,944

Avg: 68

Uncrowded91th percentileCrowded

Institutional Activity

Buy/Sell Ratio2.55x

84th percentile

153 buying60 selling

+90

New

-27

Closed

+21.1M

Net shares

Holding Period Distribution

estimate

Median: 2 QAvg: 2.1 QHolders: 192

Ownership Concentration

Top 5: 30.6%Top 10: 49.6%

BlackRock,7.2%

Deep Track Capital,6.8%

Samsara BioCapital,6.3%

Foresite Capital Management V,5.9%

venBio Partners4.5%

Others (187)69.4%

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Conviction-Weighted Ownership

Median weight: 4.93%Avg weight: 12.97%Max: 47.94%High conviction (>1%): 7

BlackRock,

Deep Track Capital,

Samsara BioCapital,

Foresite Capital Management V,

venBio Partners

Foresite Capital Management VI

VANGUARD CAPITAL MANAGEMENT

Cormorant Asset Management,

Nextech Invest,

PRICE T ROWE ASSOCIATES

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Whale Moves Timeline (7 Quarters)

Biggest dollar-value position changes among top 10 holders

NEWDeep Track Capital$149M6.8M shr

NEWVANGUARD CAPITAL MANAGEMENT$89M4.0M shr

BOUGHTBlackRock$57M2.6M shr

BOUGHTNextech Invest$14M625K shr

BOUGHTSamsara BioCapital$13M588K shr

NEWSaturn V Capital Management$31M3.1M shr

BOUGHTCormorant Asset Management$15M1.5M shr

BOUGHTSamsara BioCapital$9M956K shr

BOUGHTBlackRock$4M373K shr

BOUGHTVANGUARD GROUP$719K74K shr

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Institutional Trends (8 Quarters)

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Institutional Holders

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