Reporting owner · CIK 0001239501
Maetzold Derek J
SEC Form 4 history across 1 companies, 20 transactions and 3 filings.
PRES, CEOPres. & Chief Exec. OfficerCASTLE BIOSCIENCES INC
Open-market transaction mix0% buys0 buys · 14 sales
Available history · Aug 28, 2026 – Oct 05, 2026
Latest insider transactions
Form 4 filings from available history.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$96.6kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$113kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$305kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | M · exercise10b5-1 detectedSEC filing ↗ | $19.5kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$96.0kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$112kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$303kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | M · exercise10b5-1 detectedSEC filing ↗ | $20.5kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$711View disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$5.99kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$7.08kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$32.3kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$8.51kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$70.5kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$83.0kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | S · sale10b5-1 detectedSEC filing ↗ | -$380kView disclosure → | |
CSTLCASTLE BIOSCIENCES INC | Maetzold Derek JPRES · CEO | M · exercise10b5-1 detectedSEC filing ↗ | $29.7kView disclosure → |
Latest Form 4 facts
Quick context from source filings
Latest open-market transaction
sale at CASTLE BIOSCIENCES INC on Oct 05, 2026 valued at $96,668.
Review SEC filingLatest buy
No open-market insider purchase is available.
Monthly open-market activity
Last 3 reported months · purchases and sales
View exact monthly values
| Month | Purchases | Sales | Buy value | Sale value | Net value |
|---|---|---|---|---|---|
| Aug 2026 | 0 | 8 | $0.00 | $588,448.26 | -$588,448.26 |
| Sep 2026 | 0 | 3 | $0.00 | $512,201.66 | -$512,201.66 |
| Oct 2026 | 0 | 3 | $0.00 | $515,564.74 | -$515,564.74 |
Net value is disclosed purchases minus sales, not profit. A dash means the value is unavailable.
Ownership and transaction size
Ownership and ticket size
Average P/S size$115.4K
Median P/S size$89.5K
Direct10
Indirect10
Oct 05, 2026exercise
Filing-only signals
Deterministic matches in this insider's history
Associated companies
Companies in the disclosed reporting history
Open-market buy performance
90-day forward return on this insider's open-market purchases
No open-market purchases in available history
A 90-day purchase return requires an open-market buy. No eligible purchases are recorded in this history.
Disclosed ownership
How reported shareholdings evolved
Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.
7 observations · Aug 28, 2026 – Oct 5, 2026. Window ends at the latest available report, not today.
Selected observation · Oct 5, 202621,064 shares reported
Inspect transaction View exact observations and source transactions
| Transaction date | Shares held after | Filed | Source |
|---|---|---|---|
| Aug 28, 2026 | 33,907 | Sep 1, 2026 | View transaction |
| Aug 28, 2026 | 22,435 | Sep 1, 2026 | View transaction |
| Aug 28, 2026 | 21,479 | Sep 1, 2026 | View transaction |
| Sep 21, 2026 | 30,059 | Sep 23, 2026 | View transaction |
| Sep 21, 2026 | 21,479 | Sep 23, 2026 | View transaction |
| Oct 5, 2026 | 29,644 | Oct 7, 2026 | View transaction |
| Oct 5, 2026 | 21,064 | Oct 7, 2026 | View transaction |
Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.
Maetzold Derek J Insider Activity FAQ
SEC Form 4 context
Who is Maetzold Derek J?
Maetzold Derek J is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001239501.
Which companies has Maetzold Derek J reported transactions for?
CASTLE BIOSCIENCES INC
When was Maetzold Derek J's latest insider buy?
No open-market insider purchase is available for this period.
When was Maetzold Derek J's latest insider sale?
sale at CASTLE BIOSCIENCES INC on Oct 05, 2026 valued at $96,668.
Where can I see the original SEC filings?
Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.
Are performance metrics included?
The profile shows average and median 90-day stock returns after open-market purchases when price coverage is available. These are unadjusted stock returns, not realized trading gains. Win rates, benchmark-adjusted returns and conviction scores are not calculated.