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CSTL · Castle Biosciences Inc · Holdings

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$32.33 +0.01 (+0.03%) At close · Sep 11
Market Cap
$987.67M
Shares
30.55M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 177
Total Value: $653,710,633
Total Shares: 27,409,256
Showing 1–100 of 177 holdings by value · page 1 of 2

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 177 13F filers · Δ vs Mar 31, 2026
Top Holder
12.0%
Sep 2023 → Jun 2026 · range 10.3% – 12.0%
+1.2 pts
Top 5
36.3%
Sep 2023 → Jun 2026 · range 33.7% – 44.4%
+0.0 pts
Top 10
51.5%
Sep 2023 → Jun 2026 · range 48.6% – 61.7%
−0.8 pts
HHI
423
Sep 2023 → Jun 2026 · range 362 – 536
Broadly held+17

Quarterly Activity

vs Mar 31, 2026
New
23
Increased
79
Decreased
57
Sold Out
33
Unchanged
18
Holder count: -10
Institutional value: -3.8%
Shares held: -1.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 177
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1447362 CUSIP 14843C105 13F (30d) 52 filings 52 filers Visit website Investor relations