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Buy CSTL
Castle Biosciences Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be negative at -77.53. In total, the insiders bought 362.01K and sold 181.1K CSTL shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.
Insider Power
|
-77.53 |
| ● Buy | 362.01K shares |
| ● Sell | 181.1K shares |
|
45% Buy Activity
Negligible or No Correlation
|
|
Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
May 20, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
130 Value: $3K |
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|
May 20, 2026 Buy |
Maetzold Derek J Pres. & Chief Exec. Officer |
130 Value: $311 |
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|
May 20, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
273 Value: $5K |
||
|
May 20, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
322 Value: $6K |
||
|
May 20, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
66 Value: $1K |
||
|
May 20, 2026 Buy |
Maetzold Derek J Pres. & Chief Exec. Officer |
130 Value: $311 |
||
|
May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
1 159 Value: $25.6K |
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|
May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
198 Value: $4K |
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|
May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
168 Value: $4K |
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May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
5 308 Value: $117.2K |
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|
May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
237 Value: $5K |
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|
May 07, 2026 Buy |
Maetzold Derek J Pres. & Chief Exec. Officer |
6 214 Value: $14.9K |
||
|
May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
41 Value: $926 |
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|
May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
906 Value: $20.5K |
||
|
May 07, 2026 Buy |
Maetzold Derek J Pres. & Chief Exec. Officer |
6 214 Value: $14.9K |
||
|
May 07, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
985 Value: $21.7K |
||
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Apr 21, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
1 357 Value: $34.1K |
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|
Apr 21, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
1 153 Value: $28.9K |
||
|
Apr 21, 2026 Buy |
Maetzold Derek J Pres. & Chief Exec. Officer |
550 Value: $1K |
||
|
Apr 21, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
550 Value: $13.8K |
||
|
Apr 21, 2026 Buy |
Maetzold Derek J Pres. & Chief Exec. Officer |
550 Value: $1K |
||
|
Apr 21, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
278 Value: $7K |
||
|
Apr 06, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
1 153 Value: $28.9K |
||
|
Apr 06, 2026 Buy |
Maetzold Derek J Pres. & Chief Exec. Officer |
6 214 Value: $14.9K |
||
|
Apr 06, 2026 Sell |
Maetzold Derek J Pres. & Chief Exec. Officer |
6 214 Value: $155.5K |
About Insider Power
Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.
It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.
While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.
* October 6th, 2025 - Tested on 5562 stocks
