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 |
|---|---|---|---|---|---|---|
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $50K–$100K | 3K | $30.09 | Aug 27, 2024 |
| Oelschlager Kristen M | COO | SELL | $50K–$100K | 3K | $22.06 | Jul 31, 2024 |
| Oelschlager Kristen M | COO | SELL | $50K–$100K | 3K | $21.22 | Jul 3, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 6K | $23.40 | Jun 5, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $15K–$50K | 1K | $20.11 | Apr 25, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 5K | $20.35 | Apr 16, 2024 |
| BRADBURY DANIEL | Director | SELL | $15K–$50K | 2K | $20.45 | Apr 10, 2024 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 21K | $21.12 | Apr 8, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 6K | $21.70 | Apr 5, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 6K | $20.28 | Mar 22, 2024 |
| BRADBURY DANIEL | Director | SELL | $15K–$50K | 2K | $23.20 | Feb 9, 2024 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 21K | $23.24 | Feb 7, 2024 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 14K | $21.99 | Dec 29, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 12K | $21.95 | Dec 27, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 18K | $21.29 | Dec 22, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 21K | $20.10 | Dec 1, 2023 |
| BRADBURY DANIEL | Director | SELL | $500K+ | 30K | $20.11 | Dec 1, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $1K–$15K | 600 | $20.03 | Nov 28, 2023 |
| BRADBURY DANIEL | Director | SELL | $15K–$50K | 800 | $20.02 | Nov 28, 2023 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 6K | $20.04 | Nov 22, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 6K | $20.03 | Nov 22, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $15K–$50K | 2K | $20.05 | Sep 6, 2023 |
| BRADBURY DANIEL | Director | SELL | $15K–$50K | 2K | $20.04 | Sep 6, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 12K | $20.05 | Sep 1, 2023 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 12K | $20.04 | Sep 1, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $1K–$15K | 600 | $20.10 | Aug 7, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $500K+ | 25K | $20.04 | Jul 11, 2023 |
| BRADBURY DANIEL | Director | SELL | $1M+ | 50K | $20.39 | Jul 11, 2023 |
| Goldberg Ellen | Director | BUY | $50K–$100K | 5K | $14.38 | Jun 6, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $23.17 | May 17, 2023 |
| BRADBURY DANIEL | Director | SELL | $500K+ | 25K | $21.63 | May 8, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $21.64 | May 8, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $22.65 | Apr 14, 2023 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 7K | $22.20 | Apr 6, 2023 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 18K | $22.16 | Apr 5, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $22.14 | Apr 5, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $20.95 | Mar 16, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $24.71 | Mar 8, 2023 |
| BRADBURY DANIEL | Director | SELL | $500K+ | 25K | $23.97 | Mar 6, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $26.18 | Feb 14, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 8K | $27.11 | Feb 3, 2023 |
| BRADBURY DANIEL | Director | SELL | $500K+ | 25K | $27.48 | Feb 3, 2023 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 8K | $22.89 | Jan 5, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 9K | $22.90 | Jan 5, 2023 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 9K | $23.07 | Dec 21, 2022 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 9K | $24.79 | Dec 7, 2022 |
| BRADBURY DANIEL | Director | SELL | $100K–$500K | 8K | $23.95 | Dec 5, 2022 |
| Olson Tiffany | Director | BUY | $15K–$50K | 1K | $21.50 | Dec 1, 2022 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 9K | $20.76 | Nov 23, 2022 |
| MAETZOLD DEREK J | Pres. & Chief Exec… | SELL | $100K–$500K | 9K | $20.35 | Nov 9, 2022 |
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