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Castle Biosciences
CSTL
CSTL
186 hedge funds and large institutions have $678M invested in Castle Biosciences in 2026 Q1 according to their latest regulatory filings, with 30 funds opening new positions, 71 increasing their positions, 61 reducing their positions, and 36 closing their positions.
New
Increased
Maintained
Reduced
Closed
338% more call options, than puts
Call options by funds: $1.92M | Put options by funds: $437K
16% more repeat investments, than reductions
Existing positions increased: 71 | Existing positions reduced: 61
0.66% less ownership
Funds ownership: 93.52% → 92.86% (-0.66%)
4% less funds holding
Funds holding: 194 → 186 (-8)
17% less first-time investments, than exits
New positions opened: 30 | Existing positions closed: 36
36% less capital invested
Capital invested by funds: $1.06B → $678M (-$384M)
50% less funds holding in top 10
Funds holding in top 10: 2 → 1 (-1)
Holders
186
Holders Change
-8
Holders Change %
-4.12%
% of All Funds
2.29%
Holding in Top 10
1
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-50%
% of All Funds
0.01%
New
30
Increased
71
Reduced
61
Closed
36
Calls
$1.92M
Puts
$437K
Net Calls
+$1.48M
Net Calls Change
-$1.77M
Top Buyers
| 1 |
RI
RTW Investments
New York
|
+$21.1M |
| 2 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$10.6M |
| 3 |
Morgan Stanley
New York
|
+$7.38M |
| 4 |
SG Americas Securities
New York
|
+$7.32M |
| 5 |
Allianz Asset Management
Munich,
Germany
|
+$6.19M |
Top Sellers
| 1 |
PCM
Portolan Capital Management
Boston,
Massachusetts
|
-$12.4M |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
-$8.5M |
| 3 |
Citadel Advisors
Miami,
Florida
|
-$8.04M |
| 4 |
B
Braidwell
Stamford,
Connecticut
|
-$6.89M |
| 5 |
Bank of America
Charlotte,
North Carolina
|
-$6.39M |
