Position in CSTL
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$94,851
+$15,113 QoQ
Shares Held
3,977
+22.4% QoQ
Ownership
0.013%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2021
10 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, 2026HARBOUR INVESTMENTS, INC. holds $3,969,869 across 28 Diagnostics & Research names. CSTL ranks #8 (2.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | TMO |
Thermo Fisher Scientific Inc.
|
4,182 | $2,096,687 | |
| 2 | LH |
Labcorp Holdings Inc.
|
1,547 | $433,160 | |
| 3 | DHR |
Danaher Corp /De/
|
1,549 | $295,053 | |
| 4 | WAT |
Waters Corp /De/
|
653 | $244,901 | |
| 5 | IQV |
Iqvia Holdings Inc.
|
839 | $162,111 | |
| 6 | GH |
Guardant Health, Inc.
|
1,080 | $162,032 | |
| 7 | DGX |
Quest Diagnostics Inc
|
696 | $147,517 | |
| 8 | CSTL |
Castle Biosciences Inc
This page
|
3,977 | $94,851 |
All Filings in CSTL
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10 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $94,851 | 3,977 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $79,738 | 3,248 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $122,029 | 3,137 | Shares | Sole | 2026-02-09 | |
| 2025-09-30 | $71,429 | 3,137 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $60,994 | 2,987 | Shares | Sole | 2025-07-28 | |
| 2025-03-31 | $50,050 | 2,500 | Shares | Sole | 2025-05-08 | |
| 2024-06-30 | $49,417 | 2,270 | Shares | Sole | 2024-07-26 | |
| 2021-09-30 | $63,175 | 950 | Shares | Sole | 2021-11-15 | |
| 2021-06-30 | $69,663 | 950 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $65,037 | 950 | Shares | Sole | 2021-08-17 | |
| No filing history on record for this holder in this stock. | ||||||