LYTIR

Insider · SEC Form 4 · Pres. & Chief Exec. Officer

MAETZOLD DEREK J

In the 12 months to Nov 8, 2026, on the open market: sold $6.0M of CSTL. Filed a median of 2 business days after the trade.

Open-market purchases and sales this filer reported on SEC Form 4, by the day traded. Insiders have two business days to file. A sale marked 10b5-1 was made under a plan adopted in advance. How to read these

Insider purchases and sales, by month (last 12 months)Insider purchases: $0 in total; Insider sales: $6.0M in total.Jun: Insider sales $86KJul: Insider sales $878KAug: Insider sales $2.6MSep: Insider sales $977KOct: Insider sales $978KNov: Insider sales $523KDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $0Insider sales below: $6.0M
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.
  1. CSTLSold: CASTLE BIOSCIENCES INC Nov 2, 2026 14,496 shares filed Nov 4, 2026 6 transactions 10b5-1 plan filing $523K
  2. CSTLSold: CASTLE BIOSCIENCES INC Oct 19, 2026 14,496 shares filed Oct 21, 2026 3 transactions 10b5-1 plan filing $463K
  3. CSTLSold: CASTLE BIOSCIENCES INC Oct 5, 2026 14,496 shares filed Oct 7, 2026 3 transactions 10b5-1 plan filing $516K
  4. CSTLSold: CASTLE BIOSCIENCES INC Sep 21, 2026 14,496 shares filed Sep 23, 2026 3 transactions 10b5-1 plan filing $512K
  5. CSTLSold: CASTLE BIOSCIENCES INC Sep 11, 2026 14,518 shares filed Sep 15, 2026 6 transactions 10b5-1 plan filing $465K
  6. CSTLSold: CASTLE BIOSCIENCES INC Aug 28, 2026 18,560 shares filed Sep 1, 2026 14 transactions 10b5-1 plan filing $616K
  7. CSTLSold: CASTLE BIOSCIENCES INC Aug 14, 2026 7,232 shares filed Aug 18, 2026 7 transactions 10b5-1 plan filing $217K
  8. CSTLSold: CASTLE BIOSCIENCES INC Aug 5, 2026 3,575 shares filed Aug 6, 2026 3 transactions 10b5-1 plan filing $110K
  9. CSTLSold: CASTLE BIOSCIENCES INC Aug 4, 2026 35,441 shares filed Aug 6, 2026 6 transactions 10b5-1 plan filing $1.1M
  10. CSTLSold: CASTLE BIOSCIENCES INC Aug 3, 2026 18,493 shares filed Aug 4, 2026 3 transactions 10b5-1 plan filing $561K
  11. CSTLSold: CASTLE BIOSCIENCES INC Jul 31, 2026 10,153 shares filed Aug 4, 2026 3 transactions 10b5-1 plan filing $306K
  12. CSTLSold: CASTLE BIOSCIENCES INC Jul 27, 2026 9,836 shares filed Jul 29, 2026 14 transactions 10b5-1 plan filing $238K
  13. CSTLSold: CASTLE BIOSCIENCES INC Jul 14, 2026 4,172 shares filed Jul 16, 2026 7 transactions 10b5-1 plan filing $96K
  14. CSTLSold: CASTLE BIOSCIENCES INC Jul 1, 2026 9,836 shares filed Jul 6, 2026 7 transactions 10b5-1 plan filing $239K
  15. CSTLSold: CASTLE BIOSCIENCES INC Jun 15, 2026 4,172 shares filed Jun 17, 2026 7 transactions 10b5-1 plan filing $86K

Source: SEC Form 4 filings. Value is shares × the price reported on the filing; a filing whose price failed Lytir's check against the market price is left out, and a trade that related owners reported on separate forms is counted once. Filings can be late, amended or wrong at the source; see methodology.

Other Form 4 entries

Not counted above: entries this filer reported on Form 4 in the same 12 months that are not open-market purchases or sales. Each entry is one line of a filing.

  • CSTL: option exercise or conversion (code M), 13 entries, Jun 15 to Oct 5, 2026
Code M
An exercise or conversion of a derivative security received from the company, such as stock options.

Source: the same SEC Form 4 filings. The codes are the SEC's own transaction codes; the meanings above are a plain-words reading of the SEC's Form 4 instructions.