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Equibles

RENAISSANCE TECHNOLOGIES LLC

Position in CSTL — Castle Biosciences Inc

CIK 1037389 NEW YORK, NY
Back to CSTL Full portfolio

Position in CSTL

as of Jun 30, 2026 · filed Aug 13, 2026
Position Value
$8,853,120
-$4,227,120 QoQ
Shares Held
371,200
-30.3% QoQ
Ownership
1.22%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#16
of 176 holders
Holding Since
Mar 2020
23 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

RENAISSANCE TECHNOLOGIES LLC holds $627,204,743 across 15 Diagnostics & Research names. CSTL ranks #7 (1.4% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 MEDP
Medpace Holdings, Inc.
 415,588 $220,091,248
2 ILMN
Illumina, Inc.
 826,642 $145,348,462
3 DHR
Danaher Corp /De/
 760,636 $144,885,945
4 IDXX
Idexx Laboratories Inc /De
 109,784 $57,794,688
5 CDNA
CareDx, Inc.
 1,242,959 $35,424,331
6 BLLN
BillionToOne, Inc.
 96,600 $11,590,068
7 CSTL
Castle Biosciences Inc
This page 		371,200 $8,853,120
8 ICLR
Icon PLC
 4,500 $781,695

All Filings in CSTL

Export CSV
23 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $8,853,120 371,200
2026-03-31 $13,080,240 532,800
2025-12-31 $19,181,590 493,100
2025-09-30 $12,810,402 562,600
2025-06-30 $13,691,610 670,500
2025-03-31 $14,038,024 701,200
2024-12-31 $18,255,250 685,000
2024-09-30 $13,962,308 489,562
2024-06-30 $6,563,655 301,500
2024-03-31 $4,534,105 204,700
2023-12-31 $2,425,592 112,400
2023-09-30 $1,803,852 106,800
2023-06-30 $2,365,328 172,400
2023-03-31 $827,008 36,400
2022-12-31 $520,234 22,100
2022-09-30 $443,360 17,000
2022-06-30 $381,930 17,400
2022-03-31 $1,121,500 25,000
2021-12-31 $5,756,626 134,281
2021-03-31 $1,882,650 27,500
2020-09-30 $200,655 3,900
2020-06-30 $1,614,488 42,836
2020-03-31 $989,692 33,200