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CASTLE BIOSCI (CSTL)
NASDAQ
$29.19+$1.19 (+4.25%)
Price as of Aug 03, 2026 10:07 AM EDT- $849.2MMarket Cap
- 91.13%1-Year Change
- Diagnostics & ResearchIndustry
CASTLE BIOSCI (CSTL)
$29.19+$1.19 (+4.25%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
WASATCH ADVISORS INC | 10.63% | 3.2M | -122,185 (-3.79%) | Dec 31, 2022 |
BLACKROCK INC. | 10.04% | 3.0M | +449,286 (+14.76%) | Jun 30, 2024 |
BLACKROCK, INC. | 9.83% | 3.0M | -122,300 (-4.10%) | Mar 31, 2026 |
BLACKROCK FUNDING, INC. /DE | 9.63% | 2.9M | -198,963 (-6.81%) | Dec 31, 2024 |
RTW INVESTMENTS, LP | 9.09% | 2.8M | +643,098 (+23.31%) | Mar 31, 2026 |
VANGUARD GROUP INC | 7.25% | 2.2M | +27,511 (+1.25%) | Dec 31, 2025 |
PRINCIPAL FINANCIAL GROUP INC | 5.84% | 1.8M | -37,767 (-2.13%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
JANUS INVESTMENT FUND | 23.54% | 7.1M | +7.1M (+100.00%) | Mar 31, 2026 |
JANUS ASPEN SERIES | 6.88% | 2.1M | +2.1M (+100.00%) | Mar 31, 2026 |
VANGUARD INDEX FUNDS | 3.79% | 1.1M | +9,888 (+0.86%) | Mar 31, 2026 |
PRINCIPAL FUNDS, INC. | 2.34% | 709,150 | -101,779 (-14.35%) | Apr 30, 2026 |
DFA INVESTMENT DIMENSIONS GROUP INC | 1.69% | 512,475 | -43,886 (-8.56%) | Apr 30, 2026 |
IVY FUNDS | 1.57% | 477,630 | 0 (0.00%) | Mar 31, 2026 |
WASATCH FUNDS TRUST | 1.48% | 448,328 | -80,637 (-17.99%) | Mar 31, 2026 |
Current Ownership Distribution
- Institutions444.8M (75.55%)
- Mutual Funds140.1M (23.79%)
- Insiders3.9M (0.66%)
- Other0 (0.00%)
Insider Transactions
- 0.66% (3.9M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 4Number of InsiderSelling (last 12 months)
- $74.7MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Jul 27, 2026 | $0.00 | 6,214 | $0.00 | 78,903 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Jul 27, 2026 | $14,851.46 | 6,214 | $2.39 | 27,693 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $144,345.66 | 5,982 | $24.13 | 21,711 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $31,537.91 | 1,307 | $24.13 | 38,046 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $26,784.30 | 1,110 | $24.13 | 32,339 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $6,466.84 | 268 | $24.13 | 11,822 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $6,466.84 | 268 | $24.13 | 11,822 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $6,466.84 | 268 | $24.13 | 11,822 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $6,466.84 | 268 | $24.13 | 11,822 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $5,813.92 | 232 | $25.06 | 21,479 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $1,253.00 | 50 | $25.06 | 37,996 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $1,077.58 | 43 | $25.06 | 32,296 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $250.60 | 10 | $25.06 | 11,812 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $250.60 | 10 | $25.06 | 11,812 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $250.60 | 10 | $25.06 | 11,812 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Jul 27, 2026 | $250.60 | 10 | $25.06 | 11,812 |
Oelschlager Kristen M Chief Operating Officer | Sell | Jul 01, 2026 | $199,738.40 | 8,186 | $24.40 | 22,274 |
Oelschlager Kristen M Chief Operating Officer | Sell | Jul 01, 2026 | $9,912.00 | 400 | $24.78 | 21,874 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Apr 06, 2026 | $0.00 | 6,214 | $0.00 | 7,518 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Apr 06, 2026 | $14,851.46 | 6,214 | $2.39 | 27,693 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Apr 06, 2026 | $155,536.42 | 6,214 | $25.03 | 21,479 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Apr 06, 2026 | $33,965.71 | 1,357 | $25.03 | 48,852 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Apr 06, 2026 | $28,859.59 | 1,153 | $25.03 | 41,520 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Apr 06, 2026 | $6,958.34 | 278 | $25.03 | 2,780 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Apr 06, 2026 | $6,958.34 | 278 | $25.03 | 2,780 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Apr 06, 2026 | $6,958.34 | 278 | $25.03 | 2,780 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Apr 06, 2026 | $6,958.34 | 278 | $25.03 | 2,780 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Mar 26, 2026 | $0.00 | 550 | $0.00 | 13,732 |
Cotton Rodney | Exempt | Mar 26, 2026 | $0.00 | 5,329 | $0.00 | 5,330 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Mar 26, 2026 | $1,314.50 | 550 | $2.39 | 22,029 |