Skip to main content
Equibles

HRT FINANCIAL LP

Position in CSTL — Castle Biosciences Inc

CIK 1475597 NEW YORK, NY
Back to CSTL Full portfolio

Position in CSTL

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$2,763,094
+$2,373,781 QoQ
Shares Held
115,853
+630.6% QoQ
Ownership
0.379%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#43
of 176 holders
Holding Since
Dec 2020
13 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in CSTL Over Time

Shares Held

Position Value (USD)

Position in Diagnostics & Research

Healthcare · as of Jun 30, 2026

HRT FINANCIAL LP holds $274,130,834 across 19 Diagnostics & Research names. CSTL ranks #14 (1.0% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 GH
Guardant Health, Inc.
 703,915 $105,608,367
2 NTRA
Natera, Inc.
 125,379 $34,034,129
3 ILMN
Illumina, Inc.
 137,982 $24,261,375
4 IDXX
Idexx Laboratories Inc /De
 37,575 $19,780,983
5 SHC
Sotera Health Co
 1,111,462 $19,728,450
6 MEDP
Medpace Holdings, Inc.
 34,527 $18,285,153
7 PSNL
Personalis, Inc.
 930,816 $12,472,934
8 BLLN
BillionToOne, Inc.
 80,709 $9,683,465

All Filings in CSTL

Export CSV
13 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $2,763,094 115,853
2026-03-31 $389,313 15,858
2025-12-31 $1,853,740 47,654
2025-09-30 $1,075,632 47,239
2025-06-30 $384,426 18,826
2025-03-31 $566,265 28,285
2024-12-31 $329,633 12,369
2024-09-30 $509,395 17,861
2024-03-31 $332,493 15,011
2023-03-31 $340,981 15,008
2022-09-30 $624,589 23,949
2021-09-30 $314,212 4,725
2020-12-31 $592,330 8,821