Castle Biosciences Ownership | Who Owns Castle Biosciences?
Castle Biosciences Ownership Summary
Castle Biosciences is owned by 91.76% institutional investors, 3.16% insiders, and 5.08% retail investors. Blackrock is the largest institutional shareholder, holding 11.08% of CSTL shares. Bellevue Healthcare Ord is the top mutual fund, with 4.32% of its assets in Castle Biosciences shares.
CSTL Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Castle Biosciences | 91.76% | 3.16% | 5.08% |
| Sector | Healthcare Stocks | 488.17% | 11.08% | -399.26% |
| Industry | Diagnostics & Research Stocks | 57.60% | 10.69% | 31.72% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 3.04M | 11.08% | $66.29M |
| Blackrock funding, inc. /de | 3.15M | 10.91% | $64.42M |
| Vanguard group | 1.83M | 6.58% | $48.84M |
| Principal financial group | 1.44M | 5.16% | $38.26M |
| Portolan capital management | 1.49M | 5.15% | $30.42M |
| Wasatch advisors lp | 1.05M | 3.63% | $21.44M |
| Dimensional fund advisors lp | 999.47K | 3.59% | $26.64M |
| Ubs group | 812.60K | 2.92% | $21.66M |
| Braidwell lp | 822.74K | 2.85% | $16.80M |
| Wellington management group llp | 722.12K | 2.59% | $19.24M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Birchview capital, lp | 110.60K | 2.24% | $2.26M |
| Portolan capital management | 1.49M | 1.91% | $30.42M |
| Parkman healthcare partners | 352.26K | 0.83% | $7.19M |
| Perkins capital management | 28.00K | 0.57% | $571.66K |
| Braidwell lp | 822.74K | 0.57% | $16.80M |
| Palisade capital management, lp | 575.12K | 0.33% | $11.74M |
| Alpha dna investment management | 15.17K | 0.15% | $404.39K |
| Kornitzer capital management inc /ks | 278.31K | 0.11% | $5.68M |
| Wasatch advisors lp | 1.05M | 0.11% | $21.44M |
| Advantage alpha capital partners lp | 16.02K | 0.09% | $327.15K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Ubs group | 812.60K | 0.00% | 758.47K |
| Wellington management group llp | 722.12K | 0.00% | 722.12K |
| Braidwell lp | 822.74K | 0.57% | 457.49K |
| Blackrock | 3.04M | 0.00% | 449.29K |
| Millennium management | 548.81K | 0.01% | 408.27K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Park west asset management | - | - | -556.49K |
| Morgan stanley | 249.38K | 0.00% | -401.33K |
| Bellevue group | - | - | -301.10K |
| Soleus capital management | - | - | -252.92K |
| Cubist systematic strategies | - | - | -237.70K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Wellington management group llp | 722.12K | 0.00% | 722.12K | $19.24M |
| Bnp paribas arbitrage, snc | 249.13K | 0.00% | 249.13K | $6.64M |
| D. e. shaw | 90.56K | 0.00% | 90.56K | $2.41M |
| Empowered funds | 40.75K | 0.01% | 40.75K | $832.12K |
| Aqr capital management | 21.11K | 0.00% | 21.11K | $562.72K |
Sold Out
| Holder | Change |
|---|---|
| Nelson, van denburg & campbell wealth management group | -1.00 |
| National bank of canada /fi/ | -1.00 |
| Colonial trust advisors | -6.00 |
| Larson financial group | -12.00 |
| Fairman group | -13.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2025 | 151 | -17.03% | 26,530,454 | 2.55% | 91 | 1.12% | 85 | -19.81% | 44 | -18.52% |
| Mar 31, 2025 | 178 | -13.17% | 25,557,223 | -3.26% | 89 | 0.99% | 105 | -2.78% | 53 | -19.70% |
| Dec 31, 2024 | 202 | 3.59% | 26,322,033 | 2.20% | 94 | 1.10% | 106 | -11.67% | 65 | 38.30% |
| Sep 30, 2024 | 195 | 18.90% | 25,754,395 | 2.29% | 92 | 1.12% | 119 | 38.37% | 48 | -4.00% |
| Jun 30, 2024 | 163 | 7.24% | 25,178,603 | 0.98% | 91 | 1.08% | 85 | 18.06% | 50 | -7.41% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Bellevue Healthcare Ord | 1.20M | 4.32% | 1.20M |
| Vanguard US Total Market Shares ETF | 829.40K | 2.96% | - |
| Principal SmallCap R5 | 829.94K | 2.86% | 78.59K |
| Vanguard Total Stock Mkt Idx Inv | 826.46K | 2.85% | -18.32K |
| Principal U.S. Small Cap Equity | 781.42K | 2.71% | 159.12K |
| Strategic Advisers U.S. Total Stock | 729.16K | 2.53% | -52.62K |
| Strategic Advisers U.S. Total Stock{mg} | 693.06K | 2.47% | - |
| Wasatch Small Cap Growth Investor | 675.19K | 2.41% | -14.34K |
| Strategic Advisers Small-Mid Cap | 665.91K | 2.40% | 62.85K |
| iShares Russell 2000 ETF | 676.91K | 2.33% | -12.91K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Aug 15, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | $26.83K |
| Aug 13, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | $839.04K |
| Jun 27, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | $140.56K |
| Jun 27, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | $13.40K |
| Jun 27, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | $13.40K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q3 | - | 1 |
| 2025 Q2 | - | 20 |
| 2025 Q1 | - | 61 |
| 2024 Q4 | - | 64 |
| 2024 Q3 | - | 55 |
CSTL Ownership FAQ
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