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Equibles

RHUMBLINE ADVISERS

Position in CSTL — Castle Biosciences Inc

CIK 1115418 BOSTON, MA
Back to CSTL Full portfolio

Position in CSTL

as of Jun 30, 2026 · filed Aug 12, 2026
Position Value
$930,388
-$11,791 QoQ
Shares Held
39,010
+1.6% QoQ
Ownership
0.128%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#68
of 176 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 19% Shared 0% None 81%

Common Shares in CSTL Over Time

Shares Held

Position Value (USD)

Position in Diagnostics & Research

Healthcare · as of Jun 30, 2026

RHUMBLINE ADVISERS holds $1,233,577,400 across 30 Diagnostics & Research names. CSTL ranks #25 (0.1% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 TMO
Thermo Fisher Scientific Inc.
 593,946 $297,780,766
2 DHR
Danaher Corp /De/
 995,923 $189,703,413
3 ILMN
Illumina, Inc.
 560,716 $98,590,694
4 IDXX
Idexx Laboratories Inc /De
 169,208 $89,077,859
5 A
Agilent Technologies, Inc.
 500,807 $66,522,193
6 IQV
Iqvia Holdings Inc.
 332,138 $64,175,704
7 WAT
Waters Corp /De/
 168,771 $63,295,875
8 DGX
Quest Diagnostics Inc
 267,727 $56,744,737

All Filings in CSTL

Export CSV
26 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $930,388 39,010
2026-03-31 $942,179 38,378
2025-12-31 $1,496,405 38,468
2025-09-30 $996,369 43,758
2025-06-30 $927,006 45,397
2025-03-31 $784,503 39,186
2024-12-31 $1,063,121 39,892
2024-09-30 $1,166,496 40,901
2024-06-30 $912,075 41,896
2024-03-31 $861,812 38,908
2023-12-31 $818,054 37,908
2023-09-30 $639,252 37,848
2023-06-30 $511,879 37,309
2023-03-31 $892,782 39,295
2022-12-31 $892,448 37,912
2022-09-30 $978,495 37,519
2022-06-30 $752,446 34,280
2022-03-31 $984,048 21,936
2021-12-31 $895,897 20,898
2021-09-30 $1,413,457 21,255
2021-06-30 $1,497,618 20,423
2021-03-31 $993,354 14,510
2020-12-31 $906,726 13,503
2020-09-30 $641,890 12,476
2020-06-30 $481,075 12,764
2020-03-31 $275,563 9,244