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CASTLE BIOSCI (CSTL)
NASDAQ
$22.11+$0.73 (+3.43%)
Price as of Jun 23, 2026 7:10 PM EDT- $643.0MMarket Cap
- 12.47%1-Year Change
- Diagnostics & ResearchIndustry
CASTLE BIOSCI (CSTL)
$22.11+$0.73 (+3.43%)
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 |
iSHARES TRUST | 4.43% | 1.3M | +10,929 (+0.81%) | Mar 31, 2026 |
VANGUARD INDEX FUNDS | 3.79% | 1.1M | +9,888 (+0.86%) | Mar 31, 2026 |
PRINCIPAL FUNDS, INC. | 2.67% | 810,929 | -48,915 (-6.03%) | Jan 31, 2026 |
Fidelity Rutland Square Trust II | 2.19% | 664,357 | -178,114 (-26.81%) | Feb 28, 2026 |
DFA INVESTMENT DIMENSIONS GROUP INC | 1.83% | 556,361 | -333,180 (-59.89%) | Jan 31, 2026 |
Current Ownership Distribution
- Institutions443.8M (76.42%)
- Mutual Funds133.0M (22.90%)
- Insiders3.9M (0.67%)
- Other0 (0.00%)
Insider Transactions
- 0.67% (3.9M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 4Number of InsiderSelling (last 12 months)
- $70.5MAmount 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 | 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 |
Cotton Rodney | Exempt | Mar 26, 2026 | $0.00 | 5,329 | $0.00 | 19,331 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 26, 2026 | $14,053.05 | 550 | $25.55 | 21,479 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 26, 2026 | $34,672.71 | 1,357 | $25.55 | 50,209 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 26, 2026 | $29,460.30 | 1,153 | $25.55 | 42,673 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 26, 2026 | $7,103.18 | 278 | $25.55 | 3,058 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 26, 2026 | $7,103.18 | 278 | $25.55 | 3,058 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 26, 2026 | $7,103.18 | 278 | $25.55 | 3,058 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 26, 2026 | $7,103.18 | 278 | $25.55 | 3,058 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 18, 2026 | $16,503.50 | 650 | $25.39 | 21,479 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 17, 2026 | $483,594.50 | 18,650 | $25.93 | 22,129 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 16, 2026 | $453,045.84 | 17,449 | $25.96 | 40,905 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 16, 2026 | $3,361.68 | 126 | $26.68 | 40,779 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 13, 2026 | $336,002.19 | 13,204 | $25.45 | 58,354 |
Juvenal Tobin W Chief Commercial Officer | Sell | Mar 12, 2026 | $526,582.12 | 20,863 | $25.24 | 86,825 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 12, 2026 | $585,941.94 | 23,179 | $25.28 | 71,558 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Mar 11, 2026 | $0.00 | 6,226 | $0.00 | 14,282 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Exempt | Mar 11, 2026 | $14,880.14 | 6,226 | $2.39 | 112,047 |
MAETZOLD DEREK J Pres. & Chief Exec. Officer | Sell | Mar 11, 2026 | $451,946.79 | 17,310 | $26.11 | 94,737 |