Castle Biosciences ($CSTL) Insider Trading & Smart Money Activity
Castle Biosciences, Inc. ($CSTL) has 8 insider trades, 2 13F position changes and 1 analyst rating on file. In the last 12 months on the open market, no insider bought and 4 insiders sold ($1.70M), net -$1.70M.
- Insider buyers (12 mo)
- 0
- Insider sellers (12 mo)
- 4
- Net insider $ (12 mo)
- -$1.70M
- Congress trades (12 mo)
- 0
- 13F moves on file
- 2
- Analyst ratings on file
- 1
CSTL insider buying and selling by quarter
| Quarter | Insider buys | Insider sales | Congress buys / sales | 13F added / cut |
|---|---|---|---|---|
| Q1 2026 | 0 | 0 | 0 / 0 | 0 / 0 |
| Q2 2026 | 0 | 1 · $177.84K | 0 / 0 | 2 / 0 |
| Q3 2026 | 0 | 3 · $744.33K | 0 / 0 | 0 / 0 |
| Q4 2026 | 0 | 3 · $775.49K | 0 / 0 | 0 / 0 |
Insider buys and sales count open-market trades only (Form 4 codes P and S). Grants, option exercises and tax withholding are left out.
All CSTL insider, congress, 13F and analyst activity
| Date | Source | Who | Action | Shares | Value / amount | ΔOwn | 1W | 1M | 6M | Filing | Story |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Insider | Juvenal Tobin WChief Commercial Officer | Sell (Open-market sale) 10b5-1 | 3.29K sh | $110.61K | Read | ||||||
| Insider | Maetzold Derek JPres. & Chief Exec. Officer | Sell (Open-market sale) 10b5-1 | 14.50K sh | $515.56K | -10.6% | — | |||||
| Insider | Oelschlager Kristen MChief Operating Officer | Sell (Open-market sale) 10b5-1 | 4.15K sh | $149.32K | -4.4% | — | |||||
| Insider | Juvenal Tobin WChief Commercial Officer | Sell (Open-market sale) 10b5-1 | 1.03K sh | $35.36K | -7.1% | — | |||||
| Insider | Juvenal Tobin WChief Commercial Officer | Sell (Open-market sale) 10b5-1 | 5.54K sh | $196.77K | -4.4% | — | |||||
| Insider | Maetzold Derek JPres. & Chief Exec. Officer | Sell (Open-market sale) 10b5-1 | 14.50K sh | $512.20K | +2.7% | — | |||||
| Analyst | Roth Capital | Reiterates to buy | PT $40 | +5.2% | +6.7% | Read | |||||
| Insider | Kristen OelschlagerChief Operating Officer | Sell (Open-market sale) 10b5-1 | 8.59K sh | $177.84K | +4.5% | +18.4% | Read | ||||
| Insider | Derek MaetzoldPres. & Chief Exec. Officer | Buy (Option exercise) | 550 sh | $1.31K | +2.6% | +16.3% | Read | ||||
| 13F | Rtw Investments | Added | +643.10K sh | $57.97M | +5.3% | +8.0% | Read | ||||
| 13F | Rtw Investments | Added | +643.10K sh | $65.79M | +5.3% | +8.0% | Read |
1W / 1M / 6M = how CSTL moved from the trade or filing date.
Insider trading in CSTL: who is buying and selling
| Insider | Role | Trades | Open-market net | Shares held | Last trade |
|---|---|---|---|---|---|
| Juvenal Tobin W | Chief Commercial Officer | 3 | -$342.74K | Oct 12, 2026 | |
| Maetzold Derek J | Pres. & Chief Exec. Officer | 2 | -$1.03M | Oct 5, 2026 | |
| Oelschlager Kristen M | Chief Operating Officer | 1 | -$149.32K | Oct 1, 2026 | |
| Kristen Oelschlager | Chief Operating Officer | 1 | -$177.84K | Jun 16, 2026 | |
| Derek Maetzold | Pres. & Chief Exec. Officer | 1 | — | Jun 15, 2026 |
Institutions moving CSTL (13F)
Analyst ratings on CSTL
| Date | Firm | Action | Rating | Price target | 1W | 1M | 6M | Story |
|---|---|---|---|---|---|---|---|---|
| Roth Capital | Reiterates | buy | $40 | +5.2% | +6.7% | Read |
Frequently asked questions
Are CSTL insiders buying or selling?
Over the last 12 months 0 insiders made 0 open-market purchases worth $0 and 4 insiders made 7 open-market sales worth $1.70M, a net -$1.70M.
What is the latest insider trade in CSTL?
Juvenal Tobin W, Chief Commercial Officer filed a sell (open-market sale) of 3.29K sh worth $110.61K on Oct 12, 2026.
Which institutions changed their CSTL positions?
Recent 13F filers moving the stock include Rtw Investments.
Other diagnostics & research stocks
Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.
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