CSTLHealthcareSmall-Cap
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 Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Quick Answer
Are CSTL insiders buying or selling?
CASTLE BIOSCIENCES INC insiders reported 8 open-market buys ($12.5M) and 363 sells ($422.3M) across 371 Form 4 filings — a net selling position of $409.8M.
Source: SEC EDGAR Form 4
Key Statistics (as of Sep 2, 2026)
Total Form 4 filings
371
SEC EDGAR
Insider filers
15
Insider buys (8)
$12.5M
Insider sells (363)
$422.3M
Insider sentiment
Net sellingNet insider flow of $409.8M in net selling.
Recent CSTL insider transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 2, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 1.7K | $32.81 | $56.8K |
| Sep 1, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 18.6K | $33.20 | $616.1K |
| Aug 27, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 9.1K | $35.04 | $317.1K |
| Aug 26, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 24.6K | $34.06 | $837.9K |
| Aug 19, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 1.7K | $29.59 | $51.2K |
| Aug 18, 2026 | Frank Stokes | Chief Financial Officer | Sale | 24.9K | $29.77 | $741.5K |
| Aug 18, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 7.2K | $30.02 | $217.1K |
| Aug 6, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 1.3K | $38.39 | $49.9K |
| Aug 6, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 39.0K | $31.07 | $1.2M |
| Aug 5, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 8.6K | $29.77 | $255.6K |
| Aug 4, 2026 | Tobin W Juvenal | Chief Commercial Officer | Sale | 19.0K | $29.21 | $556.2K |
| Aug 4, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 28.6K | $30.28 | $867.5K |
| Jul 29, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 9.8K | $24.16 | $237.7K |
| Jul 16, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 4.2K | $22.92 | $95.6K |
| Jul 6, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 9.8K | $24.29 | $238.9K |
| Jul 6, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 8.6K | $24.42 | $209.7K |
| Jun 18, 2026 | Kristen M Oelschlager | Chief Operating Officer | Sale | 8.6K | $20.71 | $177.8K |
| Jun 17, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 4.2K | $20.66 | $86.2K |
| Jun 3, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 9.8K | $20.86 | $205.1K |
| May 22, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 4.2K | $20.15 | $84.1K |
| May 11, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 9.8K | $22.15 | $217.9K |
| Apr 23, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 4.2K | $25.10 | $104.7K |
| Apr 8, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 9.8K | $25.03 | $246.2K |
| Mar 30, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 4.2K | $25.55 | $106.6K |
| Mar 19, 2026 | Derek J Maetzold | Pres. & Chief Exec. Officer | Sale | 19.3K | $25.91 | $500.1K |
Showing the 25 most recent of 371 Form 4 filings for CASTLE BIOSCIENCES INC.
Most active CSTL insiders
- Derek J Maetzold178 filings
- Daniel Bradbury74 filings
- Joseph C. Cook III28 filings
- KABAKOFF DAVID S21 filings
- Kristen M Oelschlager14 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?
Across 371 SEC Form 4 filings, CASTLE BIOSCIENCES INC (CSTL) insiders reported 8 open-market purchases totaling $12.5M and 363 sales totaling $422.3M. That is a net selling position of $409.8M.
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 Sep 2, 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.
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