Position in CSTL
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$572,800
+$337,655 QoQ
Shares Held
23,332
+125.9% QoQ
Ownership
0.077%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2025
3 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 Mar 31, 2026Magnetar Financial LLC holds $12,621,245 across 10 Diagnostics & Research names. CSTL ranks #6 (4.5% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | DHR |
Danaher Corp /De/
|
16,926 | $3,209,169 | |
| 2 | A |
Agilent Technologies, Inc.
|
24,144 | $2,751,932 | |
| 3 | NTRA |
Natera, Inc.
|
9,696 | $1,939,102 | |
| 4 | RDNT |
RadNet, Inc.
|
30,849 | $1,724,150 | |
| 5 | IDXX |
Idexx Laboratories Inc /De
|
1,652 | $928,241 | |
| 6 | CSTL |
Castle Biosciences Inc
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|
23,332 | $572,800 | |
| 7 | MEDP |
Medpace Holdings, Inc.
|
977 | $469,145 | |
| 8 | IQV |
Iqvia Holdings Inc.
|
2,550 | $434,876 |
All Filings in CSTL
Export CSV
3 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $572,800 | 23,332 | Shares | Sole | 2026-05-13 | |
| 2025-09-30 | $235,145 | 10,327 | Shares | Sole | 2025-11-13 | |
| 2025-03-31 | $224,744 | 11,226 | Shares | Sole | 2025-05-15 | |
| No filing history on record for this holder in this stock. | ||||||