CSTLCASTLE BIOSCIENCES INC
Insider trading & SEC Form 4 activity — last 90 days. Latest filing: 2026-10-21.
Insider buys (90d)
$0.00
Insider sells (90d)
$8.83M
Net flow
$-8.83M
Filings
22
Buy transactions
0
Sell transactions
89
Distinct insiders
4
Last close (cached)
$34.37
as of 2026-10-21
1d return
+3.7%
5d return
+3.8%
1m return
-1.4%
Top insiders trading CSTL (90d)
Recent transactions (50)
| Filed | Txn date | Insider | Code | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-21 | 2026-10-19 | MAETZOLD DEREK J OfficerDirector | Sale | 2,718 | $31.91 | $86.7K | open → |
| 2026-10-21 | 2026-10-19 | MAETZOLD DEREK J OfficerDirector | Sale | 3,198 | $31.91 | $102.0K | open → |
| 2026-10-21 | 2026-10-19 | MAETZOLD DEREK J OfficerDirector | Sale | 8,580 | $31.91 | $273.8K | open → |
| 2026-10-14 | 2026-10-12 | Juvenal Tobin W Officer | Sale | 3,288 | $33.64 | $110.6K | open → |
| 2026-10-07 | 2026-10-05 | MAETZOLD DEREK J OfficerDirector | Sale | 2,718 | $35.57 | $96.7K | open → |
| 2026-10-07 | 2026-10-05 | MAETZOLD DEREK J OfficerDirector | Sale | 3,198 | $35.57 | $113.7K | open → |
| 2026-10-07 | 2026-10-05 | MAETZOLD DEREK J OfficerDirector | Sale | 8,580 | $35.57 | $305.2K | open → |
| 2026-10-07 | 2026-10-05 | MAETZOLD DEREK J OfficerDirector | Exer. | 8,165 | $2.39 | $19.5K | open → |
| 2026-10-05 | 2026-10-01 | Oelschlager Kristen M Officer | Sale | 1,346 | $36.38 | $49.0K | open → |
| 2026-10-05 | 2026-10-01 | Oelschlager Kristen M Officer | Sale | 2,807 | $35.75 | $100.4K | open → |
| 2026-10-05 | 2026-10-01 | Oelschlager Kristen M Officer | Exer. | 4,153 | $3.38 | $14.0K | open → |
| 2026-10-01 | 2026-09-30 | Juvenal Tobin W Officer | Sale | 1,034 | $34.20 | $35.4K | open → |
| 2026-10-01 | 2026-09-29 | Juvenal Tobin W Officer | Sale | 5,543 | $35.50 | $196.8K | open → |
| 2026-09-23 | 2026-09-21 | MAETZOLD DEREK J OfficerDirector | Sale | 2,718 | $35.33 | $96.0K | open → |
| 2026-09-23 | 2026-09-21 | MAETZOLD DEREK J OfficerDirector | Sale | 3,198 | $35.33 | $113.0K | open → |
| 2026-09-23 | 2026-09-21 | MAETZOLD DEREK J OfficerDirector | Sale | 8,580 | $35.33 | $303.2K | open → |
| 2026-09-23 | 2026-09-21 | MAETZOLD DEREK J OfficerDirector | Exer. | 8,580 | $2.39 | $20.5K | open → |
| 2026-09-16 | 2026-09-15 | Juvenal Tobin W Officer | Sale | 3,294 | $35.14 | $115.8K | open → |
| 2026-09-16 | 2026-09-14 | Juvenal Tobin W Officer | Sale | 3,306 | $32.32 | $106.9K | open → |
| 2026-09-15 | 2026-09-11 | MAETZOLD DEREK J OfficerDirector | Sale | 71 | $32.78 | $2.3K | open → |
| 2026-09-15 | 2026-09-11 | MAETZOLD DEREK J OfficerDirector | Sale | 83 | $32.78 | $2.7K | open → |
| 2026-09-15 | 2026-09-11 | MAETZOLD DEREK J OfficerDirector | Sale | 223 | $32.78 | $7.3K | open → |
| 2026-09-15 | 2026-09-11 | MAETZOLD DEREK J OfficerDirector | Sale | 2,656 | $32.00 | $85.0K | open → |
| 2026-09-15 | 2026-09-11 | MAETZOLD DEREK J OfficerDirector | Sale | 3,124 | $32.00 | $100.0K | open → |
| 2026-09-15 | 2026-09-11 | MAETZOLD DEREK J OfficerDirector | Sale | 8,361 | $32.00 | $267.6K | open → |
| 2026-09-15 | 2026-09-11 | MAETZOLD DEREK J OfficerDirector | Exer. | 8,584 | $2.39 | $20.5K | open → |
| 2026-09-03 | 2026-09-01 | Oelschlager Kristen M Officer | Sale | 200 | $34.02 | $6.8K | open → |
| 2026-09-03 | 2026-09-01 | Oelschlager Kristen M Officer | Sale | 3,952 | $33.36 | $131.8K | open → |
| 2026-09-03 | 2026-09-01 | Oelschlager Kristen M Officer | Exer. | 4,152 | $3.38 | $14.0K | open → |
| 2026-09-02 | 2026-08-31 | Juvenal Tobin W Officer | Sale | 1,730 | $32.81 | $56.8K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 21 | $33.88 | $711.48 | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 21 | $33.88 | $711.48 | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 21 | $33.88 | $711.48 | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 21 | $33.88 | $711.48 | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 177 | $33.88 | $6.0K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 209 | $33.88 | $7.1K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 956 | $33.88 | $32.4K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 257 | $33.14 | $8.5K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 257 | $33.14 | $8.5K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 257 | $33.14 | $8.5K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 257 | $33.14 | $8.5K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 2,129 | $33.14 | $70.6K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 2,505 | $33.14 | $83.0K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Sale | 11,472 | $33.14 | $380.2K | open → |
| 2026-09-01 | 2026-08-28 | MAETZOLD DEREK J OfficerDirector | Exer. | 12,428 | $2.39 | $29.7K | open → |
| 2026-08-27 | 2026-08-25 | Juvenal Tobin W Officer | Sale | 9,050 | $35.04 | $317.1K | open → |
| 2026-08-26 | 2026-08-25 | Oelschlager Kristen M Officer | Sale | 5,223 | $34.64 | $180.9K | open → |
| 2026-08-26 | 2026-08-25 | Oelschlager Kristen M Officer | Sale | 7,161 | $34.26 | $245.4K | open → |
| 2026-08-26 | 2026-08-24 | Oelschlager Kristen M Officer | Sale | 12,218 | $33.69 | $411.6K | open → |
| 2026-08-19 | 2026-08-17 | Juvenal Tobin W Officer | Sale | 1,730 | $29.59 | $51.2K | open → |
Other tickers these insiders trade
Want an email the moment a new insider transaction is filed on CSTL? Set up an alert → Watch4Insider delivers SEC Form 4 alerts with a sub-60s p95 SLA.
