CASTLE BIOSCIENCES INC Insider Trading Activity
Every SEC Form 4 insider transaction reported for CASTLE BIOSCIENCES INC (CSTL), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are CSTL insiders buying or selling?
In the last 12 months, CASTLE BIOSCIENCES INC insiders reported 0 open-market purchases ($0) and 58 sales ($18.3M) — net selling of $18.3M. Since July 2019, Trabud has recorded 379 Form 4 filings for CSTL: 8 buys ($12.5M) and 371 sells ($424.6M).
Source: SEC EDGAR Form 4
What stands out
- No CASTLE BIOSCIENCES INC insider made an open-market purchase in the last 12 months; the 58 reported open-market sales totaled $18.3M.
Key Statistics (July 2019 – Oct 14, 2026)
Total Form 4 filings
379
SEC EDGAR
Insider filers
15
Insider buys (8)
$12.5M
Insider sells (371)
$424.6M
Insider sentiment
Net sellingNet insider flow of $412.1M in net selling since July 2019, and $18.3M in net selling over the last 12 months.
Recent CSTL insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Oct 14, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 3.3K | $33.64 | $110.6K | SEC ↗ |
| Oct 7, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 14.5K | $35.57 | $515.6K | SEC ↗ |
| Oct 5, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 4.2K | $35.95 | $149.3K | SEC ↗ |
| Oct 1, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 6.6K | $35.29 | $232.1K | SEC ↗ |
| Sep 23, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 14.5K | $35.33 | $512.2K | SEC ↗ |
| Sep 16, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 6.6K | $33.73 | $222.6K | SEC ↗ |
| Sep 15, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 14.5K | $32.02 | $464.9K | SEC ↗ |
| Sep 3, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 4.2K | $33.39 | $138.6K | SEC ↗ |
| Sep 2, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 1.7K | $32.81 | $56.8K | SEC ↗ |
| Sep 1, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 18.6K | $33.20 | $616.1K | SEC ↗ |
| Aug 27, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 9.1K | $35.04 | $317.1K | SEC ↗ |
| Aug 26, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 24.6K | $34.06 | $837.9K | SEC ↗ |
| Aug 19, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 1.7K | $29.59 | $51.2K | SEC ↗ |
| Aug 18, 2026 | Frank Stokes | Chief Financial Officer | Sale | 24.9K | $29.77 | $741.5K | SEC ↗ |
| Aug 18, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 7.2K | $30.02 | $217.1K | SEC ↗ |
| Aug 6, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 1.3K | $38.39 | $49.9K | SEC ↗ |
| Aug 6, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 39.0K | $31.07 | $1.2M | SEC ↗ |
| Aug 5, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 8.6K | $29.77 | $255.6K | SEC ↗ |
| Aug 4, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 19.0K | $29.21 | $556.2K | SEC ↗ |
| Aug 4, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 28.6K | $30.28 | $867.5K | SEC ↗ |
| Jul 29, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 9.8K | $24.16 | $237.7K | SEC ↗ |
| Jul 16, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 4.2K | $22.92 | $95.6K | SEC ↗ |
| Jul 6, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 9.8K | $24.29 | $238.9K | SEC ↗ |
| Jul 6, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 8.6K | $24.42 | $209.7K | SEC ↗ |
| Jun 18, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 8.6K | $20.71 | $177.8K | SEC ↗ |
Showing the 25 most recent of 379 Form 4 filings for CASTLE BIOSCIENCES INC.
Most active CSTL insiders
- Derek J Maetzold181 filings
- Daniel Bradbury74 filings
- Joseph C. Cook III28 filings
- KABAKOFF DAVID S21 filings
- Kristen M Oelschlager16 filings
Ask anything about CSTL insider activity
Use Trabud's AI agent to query CASTLE BIOSCIENCES INC's Form 4 history in plain English — "Show me CSTL CEO purchases this year" or compare it against any other ticker.
Open the AI agentCSTL insider trading FAQ
Are CASTLE BIOSCIENCES INC insiders buying or selling?
In the last 12 months, CASTLE BIOSCIENCES INC insiders reported 0 open-market purchases ($0) and 58 sales ($18.3M) — net selling of $18.3M. Since July 2019, Trabud has recorded 379 Form 4 filings for CSTL: 8 buys ($12.5M) and 371 sells ($424.6M). Over the full record that is net selling of $412.1M.
How many insiders trade CSTL stock?
15 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for CASTLE BIOSCIENCES INC. The most recent filing was accepted on Oct 14, 2026.
Where does Trabud get CSTL insider trading data?
All CSTL insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.