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PERKINS CAPITAL MANAGEMENT INC

Position in CSTL — Castle Biosciences Inc

CIK 884300 WAYZATA, MN

Position in CSTL

as of Jun 30, 2026 · filed Jul 24, 2026
Position Value
$384,939
+$6,501 QoQ
Shares Held
16,140
+4.7% QoQ
Ownership
0.053%
of shares outstanding
% of Portfolio
0.30%
of 13F equity value
Holder Rank
#6
of 27 holders
Holding Since
Mar 2020
25 quarters on record
Voting authority Sole 92% Shared 0% None 8%

Common Shares in CSTL Over Time

Shares Held

Position Value (USD)

Position in Diagnostics & Research

Healthcare · as of Jun 30, 2026

PERKINS CAPITAL MANAGEMENT INC holds $26,693,573 across 9 Diagnostics & Research names. CSTL ranks #8 (1.4% of the industry book) .

# Ticker Company Shares Value (USD) Open
8 CSTL
Castle Biosciences Inc
This page
16,140 $384,939

All Filings in CSTL

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25 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $384,939 16,140
2026-03-31 $378,438 15,415
2025-12-31 $1,090,950 28,045
2025-09-30 $640,861 28,145
2025-06-30 $571,657 27,995
2025-03-31 $679,979 33,965
2024-12-31 $910,497 34,165
2024-09-30 $930,892 32,640
2024-06-30 $676,829 31,090
2024-03-31 $711,901 32,140
2023-12-31 $693,581 32,140
2023-09-30 $492,512 29,160
2023-06-30 $419,626 30,585
2023-03-31 $706,819 31,110
2022-12-31 $732,329 31,110
2022-09-30 $811,348 31,110
2022-06-30 $728,081 33,170
2022-03-31 $1,488,006 33,170
2021-12-31 $1,421,997 33,170
2021-09-30 $2,204,475 33,150
2021-06-30 $2,430,889 33,150
2021-03-31 $2,293,410 33,500
2020-12-31 $2,316,675 34,500
2020-09-30 $1,795,605 34,900
2020-03-31 $1,009,068 33,850