13F Insight
DOSSIER · 13F Holders · Q3 2026Healthcare · Services-Medical Laboratories
CSTL

CASTLE BIOSCIENCES INC

203 institutions still hold CASTLE BIOSCIENCES INC as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 14843C105·Services-Medical Laboratories·203 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$851M
visible holders
Holders
203
filers reporting
Concentration
14.42%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q3 2026

203 institutions reported CSTL in Q3 2026. BlackRock, Inc. leads at 14.4% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$123M3.5M0.00%Q3 202602
RTW INVESTMENTS, LP
CIK 0001493215
$66M2.8M0.57%Q2 202603
PRINCIPAL FINANCIAL GROUP INC
CIK 0001126328
$53M1.5M0.03%Q3 202604
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$44M1.2M0.00%Q3 202605
ACADIAN ASSET MANAGEMENT LLC
CIK 0000916542
$31M882K0.04%Q3 202606
STATE STREET CORP
CIK 0000093751
$29M805K0.00%Q3 202607
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$28M794K0.00%Q3 202608
Vanguard Portfolio Management
CIK 0002100121· Index
$25M717K0.00%Q3 202609
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$25M692K0.00%Q3 202610
Jefferies Financial Group Inc.
CIK 0000096223
$23M647K0.17%Q3 202611
Allianz Asset Management GmbH
CIK 0001535323
$21M879K0.02%Q2 202612
MACKENZIE FINANCIAL CORP
CIK 0000919859
$20M568K0.02%Q3 202613
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC
CIK 0001638555
$20M825K0.35%Q2 202614
Qube Research & Technologies Ltd
CIK 0001729829
$17M475K0.01%Q3 202615
Connor, Clark & Lunn Investment Management Ltd.
CIK 0001596800
$13M370K0.02%Q3 202616
KENNEDY CAPITAL MANAGEMENT LLC
CIK 0000884589
$12M339K0.23%Q3 202617
PANAGORA ASSET MANAGEMENT INC
CIK 0000883677
$12M332K0.04%Q3 202618
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$11M322K0.02%Q3 202619
EVENTIDE ASSET MANAGEMENT, LLC
CIK 0001442891
$11M300K0.15%Q3 202620
WASATCH ADVISORS LP
CIK 0000814133
$10M279K0.07%Q3 2026
Page 1 of 11
183 more holders available. Log in →
Insiders at CASTLE BIOSCIENCES INC
Juvenal Tobin W →Maetzold Derek J →Oelschlager Kristen M →