CASTLE BIOSCIENCES INC

PublicCIK: 1447362
CSTLNASDAQ
Location

FRIENDSWOOD, TX

13F Filings

Institutional Holders

CASTLE BIOSCIENCES INCCSTL— Latest position per institution from SEC 13F filings

15

Institutional holders

24.59M

Total shares held

567.75M

Estimated value

1.23M

Avg. position size

1

BLACKROCK, INC.

CIK 2012383

Shares

3.29M

Value

78.51M

Filed

Jun 30, 2026

2

BLACKROCK FINANCE, INC.

CIK 1364742

Shares

3.04M

Value

66.29M

Filed

Jun 30, 2024

3

RTW INVESTMENTS, LP

CIK 1493215

Shares

2.78M

Value

66.26M

Filed

Jun 30, 2026

4

VANGUARD GROUP INC

CIK 102909

Shares

2.20M

Value

85.57M

Filed

Dec 31, 2025

5

PRINCIPAL FINANCIAL GROUP INC

CIK 1126328

Shares

1.73M

Value

41.18M

Filed

Jun 30, 2026

6

VANGUARD CAPITAL MANAGEMENT LLC

CIK 2100119

Shares

1.23M

Value

29.25M

Filed

Jun 30, 2026

7

ACADIAN ASSET MANAGEMENT LLC

CIK 916542

Shares

918.67K

Value

21.90K

Filed

Jun 30, 2026

8

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

CIK 1081019

Shares

901.58K

Value

37.80K

Filed

Jun 30, 2026

9

VANGUARD PORTFOLIO MANAGEMENT LLC

CIK 2100121

Shares

840.78K

Value

20.05M

Filed

Jun 30, 2026

10

SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC

CIK 1638555

Shares

824.87K

Value

19.67M

Filed

Jun 30, 2026

11

STATE STREET CORP

CIK 93751

Shares

822.08K

Value

19.63M

Filed

Jun 30, 2026

12

ALLIANZ ASSET MANAGEMENT GMBH

CIK 1535323

Shares

811.32K

Value

19.92M

Filed

Jun 30, 2026

13

GEODE CAPITAL MANAGEMENT, LLC

CIK 1214717

Shares

795.91K

Value

18.99M

Filed

Jun 30, 2026

14

MACKENZIE FINANCIAL CORP

CIK 919859

Shares

793.51K

Value

18.93M

Filed

Jun 30, 2026

15

DIMENSIONAL FUND ADVISORS LP

CIK 354204

Shares

791.09K

Value

18.87M

Filed

Jun 30, 2026

16

JEFFERIES FINANCIAL GROUP INC.

CIK 96223

Shares

647.39K

Value

15.44M

Filed

Jun 30, 2026

17

QUBE RESEARCH & TECHNOLOGIES LTD

CIK 1729829

Shares

589.30K

Value

14.05M

Filed

Jun 30, 2026

18

PARK WEST ASSET MANAGEMENT LLC

CIK 1386928

Shares

556.49K

Value

11.14M

Filed

Mar 31, 2025

19

AIGH CAPITAL MANAGEMENT LLC

CIK 1835943

Shares

545.10K

Value

13M

Filed

Jun 30, 2026

20

ESSEX INVESTMENT MANAGEMENT CO LLC

CIK 201772

Shares

480.92K

Value

10.93M

Filed

Mar 31, 2023

Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.