CASTLE BIOSCIENCES INC
Total Trades
125
Buys
3
Sells
118
Largest Trade
$1M+
Insiders
7
Institutional Funds
149
Inst. Value
$1M+
Activist Filings
17
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Stokes Frank | CFO | SELL | $100K–$500K | 7K | $27.44 | Mar 5, 2026 |
| Stokes Frank | CFO | EXERCISE | $1K–$15K | 28K | $0.46 | Mar 5, 2026 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 4K | $39.52 | Feb 5, 2026 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 4K | $40.01 | Jan 22, 2026 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 4K | $38.76 | Jan 7, 2026 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $15K–$50K | 830 | $40.35 | Dec 29, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $15K–$50K | 509 | $40.04 | Dec 19, 2025 |
| Oelschlager Kristen M | COO | SELL | $500K+ | 15K | $39.31 | Dec 19, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $1M+ | 32K | $38.69 | Dec 17, 2025 |
| Juvenal Tobin W | Chief Commercial O… | SELL | $100K–$500K | 13K | $37.48 | Dec 15, 2025 |
| Stokes Frank | CFO | SELL | $100K–$500K | 4K | $37.45 | Dec 15, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $50K–$100K | 1K | $40.03 | Dec 8, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 3K | $39.23 | Dec 4, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 4K | $40.09 | Dec 1, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 5K | $40.05 | Nov 26, 2025 |
| Juvenal Tobin W | Chief Commercial O… | SELL | $100K–$500K | 5K | $35.58 | Nov 24, 2025 |
| Juvenal Tobin W | Chief Commercial O… | EXERCISE | $15K–$50K | 5K | $3.38 | Nov 24, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $50K–$100K | 3K | $34.02 | Nov 20, 2025 |
| Stokes Frank | CFO | SELL | $100K–$500K | 5K | $35.08 | Nov 13, 2025 |
| Juvenal Tobin W | Chief Commercial O… | SELL | $15K–$50K | 700 | $35.39 | Nov 13, 2025 |
| Oelschlager Kristen M | COO | SELL | $500K+ | 19K | $35.10 | Nov 13, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 9K | $30.84 | Nov 6, 2025 |
| Oelschlager Kristen M | COO | SELL | $100K–$500K | 13K | $25.04 | Nov 5, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $15K–$50K | 1K | $22.44 | Oct 23, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $15K–$50K | 1K | $21.97 | Sep 19, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $15K–$50K | 1K | $23.93 | Sep 4, 2025 |
| Oelschlager Kristen M | COO | SELL | $100K–$500K | 13K | $22.02 | Aug 29, 2025 |
| Oelschlager Kristen M | COO | SELL | $100K–$500K | 18K | $21.69 | Aug 29, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 23K | $20.30 | Jul 1, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 6K | $21.52 | Apr 23, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 6K | $20.19 | Apr 10, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 6K | $20.30 | Mar 28, 2025 |
| Stokes Frank | CFO | SELL | $100K–$500K | 8K | $26.70 | Feb 24, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $50K–$100K | 3K | $28.03 | Jan 15, 2025 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 8K | $29.14 | Jan 8, 2025 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $29.66 | Jan 8, 2025 |
| Juvenal Tobin W | Chief Commercial O… | SELL | $50K–$100K | 2K | $30.00 | Jan 8, 2025 |
| Stokes Frank | CFO | SELL | $100K–$500K | 7K | $29.93 | Nov 19, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 5K | $34.15 | Nov 14, 2024 |
| Juvenal Tobin W | Chief Commercial O… | SELL | $100K–$500K | 4K | $35.56 | Nov 7, 2024 |
| Juvenal Tobin W | Chief Commercial O… | EXERCISE | $1K–$15K | 4K | $3.38 | Nov 7, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 5K | $32.54 | Nov 6, 2024 |
| Juvenal Tobin W | Chief Commercial O… | EXERCISE | $1K–$15K | 1K | $3.38 | Nov 5, 2024 |
| Juvenal Tobin W | Chief Commercial O… | SELL | $100K–$500K | 3K | $35.39 | Nov 5, 2024 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 8K | $34.73 | Nov 5, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 5K | $32.27 | Oct 16, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $50K–$100K | 3K | $30.27 | Oct 10, 2024 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 8K | $29.44 | Oct 9, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $50K–$100K | 3K | $28.73 | Oct 8, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 4K | $30.08 | Sep 3, 2024 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 149 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| VANGUARD GROUP INC | 2.0M | $1M+ | SH |
| Portolan Capital Management, LLC | 1.7M | $1M+ | SH |
| DIMENSIONAL FUND ADVISORS LP | 1.1M | $1M+ | SH |
| STATE STREET CORP | 736K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 620K | $1M+ | SH |
| Allianz Asset Management GmbH | 598K | $1M+ | SH |
| WASATCH ADVISORS LP | 537K | $1M+ | SH |
| SCHRODER INVESTMENT MANAGEMENT GROUP | 492K | $1M+ | SH |
| RENAISSANCE TECHNOLOGIES LLC | 493K | $1M+ | SH |
| ACADIAN ASSET MANAGEMENT LLC | 390K | $1M+ | SH |
| Connor, Clark & Lunn Investment Management Ltd. | 388K | $1M+ | SH |
| EVENTIDE ASSET MANAGEMENT, LLC | 305K | $1M+ | SH |
| KORNITZER CAPITAL MANAGEMENT INC /KS | 268K | $1M+ | SH |
| Advisors Capital Management, LLC | 251K | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 243K | $1M+ | SH |
| NEW YORK STATE COMMON RETIREMENT FUND | 233K | $1M+ | SH |
| BRAIDWELL LP | 177K | $1M+ | SH |
| AIGH Capital Management LLC | 169K | $1M+ | SH |
| TUDOR INVESTMENT CORP ET AL | 167K | $1M+ | SH |
| BNP PARIBAS FINANCIAL MARKETS | 150K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Jan 21, 2026
3.9%
1.1M shares
SC 13G · Oct 9, 2025
5.1%
1.5M shares
SC 13G/A · May 12, 2025
3.5%
998K shares
SC 13G/A · Apr 24, 2025
8.2%
2.3M shares
Portolan Capital Management, LLC
SC 13G · Apr 14, 2025
5.7%
1.6M shares
SC 13G/A · Jan 31, 2025
6.5%
1.8M shares
Granahan Investment Management LLC
SC 13G/A · Nov 14, 2024
1.5%
425K shares
Wasatch Advisors LP 87-0319391
SC 13G/A · Nov 13, 2024
6.6%
1.8M shares
SC 13G/A · Jul 8, 2024
11.0%
3.0M shares
Granahan Investment Management LLC
SC 13G · Feb 14, 2024
8.1%
2.2M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
5.4%
1.5M shares
Principal Global Investors, LLC
SC 13G · Feb 13, 2024
5.9%
1.6M shares
SC 13G/A · Jan 25, 2024
8.5%
2.3M shares
Wasatch Advisors LP 87-0319391
SC 13G/A · Feb 9, 2023
12.2%
3.2M shares
SC 13G/A · Feb 3, 2023
8.1%
2.1M shares
SC 13G/A · Feb 11, 2022
4.0%
1.0M shares
Wasatch Advisors, Inc. 87-0319391
SC 13G/A · Feb 10, 2022
12.3%
3.1M shares