Castle Biosciences Inc (CSTL): Congress and insider trades
Who in Congress and inside the company traded CSTL, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- Castle Biosciences Inc (CSTL) is a listed stock on NASDAQ.
- 2 members of Congress filed 2 buys and 1 sell of CSTL, the latest published 2022-04-18 (18 April 2022).
- Insiders filed 0 open market buys worth $0 and 43 sells worth $8.1M, the latest filed 2026-09-23 (23 September 2026).
- Across 2 scored buys, Congress averaged -16.7% against the S&P 500 (SPY) over the 90 days after disclosure, with 0% of them ahead of the index. That result is too few trades to tell.
- Data as of 2026-09-29 (29 September 2026).
Congress trades in CSTL
as of 2022-04-18| Filed | Member | Type | Size | Days to file | 90 day vs S&P |
|---|---|---|---|---|---|
| 18 Apr 2022 | Josh Gottheimer (D-NJ) | sell | 1Kâ15K | 33 | n/a |
| 12 Jan 2021 | Gil Cisneros (D-CA) | buy | 1Kâ15K | 19 | -15.3% |
| 8 Jan 2021 | Josh Gottheimer (D-NJ) | buy | 1Kâ15K | 17 | -18.2% |
Nothing matches that search.
Insider trades in CSTL
as of 2026-09-23| Filed | Insider | Type | Shares | Price | Value | 90 day vs S&P |
|---|---|---|---|---|---|---|
| 23 Sep 2026 | MAETZOLD DEREK J | sell | 5,916 | $35.33 | $209K | n/a |
| 23 Sep 2026 | MAETZOLD DEREK J | sell | 8,580 | $35.33 | $303K | n/a |
| 1 Sep 2026 | MAETZOLD DEREK J | sell | 12,428 | $33.20 | $413K | n/a |
| 1 Sep 2026 | MAETZOLD DEREK J | sell | 6,132 | $33.20 | $204K | n/a |
| 27 Aug 2026 | Juvenal Tobin W | sell | 9,050 | $35.04 | $317K | n/a |
| 26 Aug 2026 | Oelschlager Kristen M | sell | 12,218 | $33.69 | $412K | n/a |
| 26 Aug 2026 | Oelschlager Kristen M | sell | 12,384 | $34.42 | $426K | n/a |
| 6 Aug 2026 | MAETZOLD DEREK J | sell | 1,029 | $30.68 | $31.6K | n/a |
| 6 Aug 2026 | MAETZOLD DEREK J | sell | 2,546 | $30.68 | $78.1K | n/a |
| 6 Aug 2026 | Juvenal Tobin W | sell | 1,301 | $38.39 | $49.9K | n/a |
| 6 Aug 2026 | MAETZOLD DEREK J | sell | 20,356 | $31.11 | $633K | n/a |
| 6 Aug 2026 | MAETZOLD DEREK J | sell | 15,085 | $31.11 | $469K | n/a |
| 5 Aug 2026 | Oelschlager Kristen M | sell | 8,586 | $29.77 | $256K | n/a |
| 4 Aug 2026 | Juvenal Tobin W | sell | 1,730 | $28.25 | $48.9K | n/a |
| 4 Aug 2026 | MAETZOLD DEREK J | sell | 3,673 | $30.15 | $111K | n/a |
| 4 Aug 2026 | Juvenal Tobin W | sell | 17,310 | $29.31 | $507K | n/a |
| 4 Aug 2026 | MAETZOLD DEREK J | sell | 6,480 | $30.15 | $195K | n/a |
| 4 Aug 2026 | MAETZOLD DEREK J | sell | 7,829 | $30.35 | $238K | n/a |
| 4 Aug 2026 | MAETZOLD DEREK J | sell | 10,664 | $30.35 | $324K | n/a |
| 29 Jul 2026 | MAETZOLD DEREK J | sell | 3,622 | $24.16 | $87.5K | n/a |
| 29 Jul 2026 | MAETZOLD DEREK J | sell | 6,214 | $24.16 | $150K | n/a |
| 16 Jul 2026 | MAETZOLD DEREK J | sell | 550 | $22.92 | $12.6K | n/a |
| 16 Jul 2026 | MAETZOLD DEREK J | sell | 3,622 | $22.92 | $83.0K | n/a |
| 6 Jul 2026 | MAETZOLD DEREK J | sell | 3,622 | $24.29 | $88.0K | n/a |
| 6 Jul 2026 | Oelschlager Kristen M | sell | 8,586 | $24.42 | $210K | n/a |
| 6 Jul 2026 | MAETZOLD DEREK J | sell | 6,214 | $24.29 | $151K | n/a |
| 18 Jun 2026 | Oelschlager Kristen M | sell | 8,587 | $20.71 | $178K | n/a |
| 17 Jun 2026 | MAETZOLD DEREK J | sell | 3,622 | $20.66 | $74.8K | n/a |
| 17 Jun 2026 | MAETZOLD DEREK J | sell | 550 | $20.66 | $11.4K | n/a |
| 22 May 2026 | MAETZOLD DEREK J | sell | 859 | $20.00 | $17.2K | n/a |
| 22 May 2026 | MAETZOLD DEREK J | sell | 2,763 | $20.20 | $55.8K | n/a |
| 22 May 2026 | MAETZOLD DEREK J | sell | 130 | $20.00 | $2.6K | n/a |
| 22 May 2026 | MAETZOLD DEREK J | sell | 420 | $20.20 | $8.5K | n/a |
| 23 Apr 2026 | MAETZOLD DEREK J | sell | 550 | $25.10 | $13.8K | n/a |
| 23 Apr 2026 | MAETZOLD DEREK J | sell | 3,622 | $25.10 | $90.9K | n/a |
| 8 Apr 2026 | MAETZOLD DEREK J | sell | 3,622 | $25.03 | $90.7K | n/a |
| 8 Apr 2026 | MAETZOLD DEREK J | sell | 6,214 | $25.03 | $156K | n/a |
| 30 Mar 2026 | MAETZOLD DEREK J | sell | 3,622 | $25.55 | $92.5K | n/a |
| 30 Mar 2026 | MAETZOLD DEREK J | sell | 550 | $25.55 | $14.1K | n/a |
| 19 Mar 2026 | MAETZOLD DEREK J | sell | 650 | $25.39 | $16.5K | n/a |
| 19 Mar 2026 | MAETZOLD DEREK J | sell | 18,650 | $25.93 | $484K | n/a |
| 17 Mar 2026 | MAETZOLD DEREK J | sell | 17,575 | $25.97 | $456K | n/a |
| 17 Mar 2026 | MAETZOLD DEREK J | sell | 13,204 | $25.45 | $336K | n/a |
Nothing matches that search.
Related pages
Frequently asked questions
Who has bought CSTL?
2 Congress buys by 2 members and 0 insider buys are on file. The tables on this page list every one.
Did buying CSTL after a disclosure beat the market?
Across 2 scored buys, Congress averaged -16.7% against the S&P 500 (SPY) over the 90 days after disclosure, with 0% of them ahead of the index. That result is too few trades to tell. A single stock is a small sample.
Sources: Congressional trades: STOCK Act disclosures, collected from CapitolTrades. Insider trades: SEC Form 4 filings, collected from Finviz. Prices: Yahoo Finance daily adjusted closes. Data as of 2026-09-29 (29 September 2026). About these sources.
Not investment advice. Past disclosed trades do not predict future returns. Disclosures are published late, so the trades shown are ones you could only have copied after the fact. Talk to a licensed adviser before you invest.