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Equibles

XTX Topco Ltd

Position in CSTL — Castle Biosciences Inc

CIK 1828301 LONDON, X0
Back to CSTL Full portfolio

Position in CSTL

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$952,163
+$454,216 QoQ
Shares Held
39,923
+96.8% QoQ
Ownership
0.131%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#67
of 176 holders
Holding Since
Mar 2023
8 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

XTX Topco Ltd holds $46,118,441 across 32 Diagnostics & Research names. CSTL ranks #16 (2.1% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 IDXX
Idexx Laboratories Inc /De
 12,097 $6,368,344
2 MTD
Mettler Toledo International Inc/
 4,908 $6,270,019
3 NTRA
Natera, Inc.
 11,650 $3,162,392
4 ICLR
Icon PLC
 15,577 $2,705,880
5 GH
Guardant Health, Inc.
 17,789 $2,668,883
6 RVTY
Revvity, Inc.
 22,919 $2,549,967
7 IQV
Iqvia Holdings Inc.
 12,571 $2,428,968
8 QGEN
Qiagen N.V.
 59,755 $2,336,420

All Filings in CSTL

Export CSV
8 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $952,163 39,923
2026-03-31 $497,947 20,283
2025-12-31 $860,662 22,125
2025-06-30 $945,466 46,301
2025-03-31 $392,952 19,628
2024-06-30 $217,765 10,003
2023-12-31 $305,249 14,145
2023-03-31 $369,290 16,254