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CASTLE BIOSCI (CSTL)
NASDAQ
$34.21+$0.010 (+0.03%)
Price as of Aug 21, 2026 7:30 PM EDT- $1.0BMarket Cap
- 64.11%1-Year Change
- Diagnostics & ResearchIndustry
CASTLE BIOSCI (CSTL)
$34.21+$0.010 (+0.03%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
BLACKROCK, INC. | 10.78% | 3.3M | +309,017 (+9.39%) | Jun 30, 2026 |
WASATCH ADVISORS INC | 10.55% | 3.2M | -122,185 (-3.79%) | Dec 31, 2022 |
BLACKROCK INC. | 9.97% | 3.0M | +449,286 (+14.76%) | Jun 30, 2024 |
BLACKROCK FUNDING, INC. /DE | 9.56% | 2.9M | -198,963 (-6.81%) | Dec 31, 2024 |
RTW INVESTMENTS, LP | 9.09% | 2.8M | +20,000 (+0.72%) | Jun 30, 2026 |
VANGUARD GROUP INC | 7.20% | 2.2M | +27,511 (+1.25%) | Dec 31, 2025 |
PRINCIPAL FINANCIAL GROUP INC | 5.65% | 1.7M | -43,229 (-2.50%) | Jun 30, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
JANUS INVESTMENT FUND | 23.37% | 7.1M | +7.1M (+100.00%) | Mar 31, 2026 |
JANUS ASPEN SERIES | 6.83% | 2.1M | +2.1M (+100.00%) | Mar 31, 2026 |
VANGUARD INDEX FUNDS | 3.76% | 1.1M | +9,888 (+0.86%) | Mar 31, 2026 |
PRINCIPAL FUNDS, INC. | 2.32% | 709,150 | -101,779 (-14.35%) | Apr 30, 2026 |
DFA INVESTMENT DIMENSIONS GROUP INC | 1.68% | 512,475 | -43,886 (-8.56%) | Apr 30, 2026 |
IVY FUNDS | 1.56% | 477,630 | 0 (0.00%) | Mar 31, 2026 |
WASATCH FUNDS TRUST | 1.47% | 448,328 | -80,637 (-17.99%) | Mar 31, 2026 |
Current Ownership Distribution
- Institutions472.2M (76.60%)
- Mutual Funds140.3M (22.76%)
- Insiders4.0M (0.64%)
- Other0 (0.00%)
Insider Transactions
- 0.64% (4.0M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 4Number of InsiderSelling (last 12 months)
- $82.4MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
Juvenal Tobin W Chief Commercial Officer | Sell | Aug 17, 2026 | $51,190.70 | 1,730 | $29.59 | 75,964 |
Stokes Frank Chief Financial Officer | Sell | Aug 14, 2026 | $741,511.16 | 24,908 | $29.77 | 35,177 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Aug 14, 2026 | $0.00 | 1,100 | $0.00 | 37,757 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Aug 14, 2026 | $2,629.00 | 1,100 | $2.39 | 22,579 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Aug 14, 2026 | $33,022.00 | 1,100 | $30.02 | 21,479 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Aug 14, 2026 | $81,474.28 | 2,714 | $30.02 | 20,355 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Aug 14, 2026 | $69,226.12 | 2,306 | $30.02 | 17,301 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Aug 14, 2026 | $8,345.56 | 278 | $30.02 | 11,534 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Aug 14, 2026 | $8,345.56 | 278 | $30.02 | 11,534 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Aug 14, 2026 | $8,345.56 | 278 | $30.02 | 11,534 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Aug 14, 2026 | $8,345.56 | 278 | $30.02 | 11,534 |
Oelschlager Kristen M Chief Operating Officer | Sell | Aug 03, 2026 | $87,360.00 | 3,000 | $29.12 | 18,874 |
Oelschlager Kristen M Chief Operating Officer | Sell | Aug 03, 2026 | $134,580.00 | 4,486 | $30.00 | 14,388 |
Oelschlager Kristen M Chief Operating Officer | Sell | Aug 03, 2026 | $33,682.00 | 1,100 | $30.62 | 13,288 |
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 |