Proto Labs, Inc. (PRLB)

Highly Crowded

Held by 245 of 5,944 reporting institutions (93th percentile) — extremely crowded.

Data as of Q1 2026

Institutional Ownership

89.68%

QoQ Change

+0.44%

Total Value

$1.2T

Shares Outstanding

23.8M

Crowding AnalysisHighly Crowded

Holders245of 5,944

Avg: 68

Uncrowded93th percentileCrowded

Institutional Activity

Buy/Sell Ratio1.19x

81th percentile

127 buying107 selling

+53

New

-28

Closed

+277K

Net shares

Holding Period Distribution

estimate

Median: 3 QAvg: 3.4 QHolders: 245

Ownership Concentration

Top 5: 47.2%Top 10: 62.5%

BlackRock,17.2%

DISCIPLINED GROWTH INVESTORS INC /MN11.7%

VANGUARD PORTFOLIO MANAGEMENT7.2%

DIMENSIONAL FUND ADVISORS6.0%

STATE STREET5.1%

Others (240)52.8%

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Conviction-Weighted Ownership

Median weight: 0.01%Avg weight: 0.52%Max: 2.91%High conviction (>1%): 2

BlackRock,

DISCIPLINED GROWTH INVESTORS INC /MN

VANGUARD PORTFOLIO MANAGEMENT

DIMENSIONAL FUND ADVISORS

STATE STREET

VANGUARD CAPITAL MANAGEMENT

AMERICAN CAPITAL MANAGEMENT

GEODE CAPITAL MANAGEMENT,

RENAISSANCE TECHNOLOGIES

Rubric Capital Management

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Whale Moves Timeline (8 Quarters)

Biggest dollar-value position changes among top 10 holders

NEWVANGUARD PORTFOLIO MANAGEMENT$88M1.5M shr

NEWVANGUARD CAPITAL MANAGEMENT$59M1.0M shr

SOLDRubric Capital Management$36M637K shr

SOLDDISCIPLINED GROWTH INVESTORS INC /MN$10M176K shr

BOUGHTBlackRock$3M59K shr

NEWAMERICAN CAPITAL MANAGEMENT$32M631K shr

SOLDSTATE STREET$4M87K shr

BOUGHTDISCIPLINED GROWTH INVESTORS INC /MN$4M81K shr

SOLDVANGUARD GROUP$4M79K shr

SOLDRENAISSANCE TECHNOLOGIES$3M50K shr

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Institutional Trends (8 Quarters)

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Institutional Holders

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