NASDAQ:CSTL

Castle Biosciences Stock Insider Trading

Healthcare > Medical - Diagnostics & Research

Buy CSTL

*Your capital is at risk

$20.39

+0.680 (+3.45%)

At Close: Jun 03, 2026

Castle Biosciences Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -42.07. In total, the insiders bought 746.38K and sold 215.96K 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 (Last 100 transactions)	-42.07
● Buy	746.38K shares
● Sell	215.96K shares
52% Buy Activity Negligible or No Correlation
Buy Signal Low Confidence May 22, 2026 Analysis Breakdown: Signal is highly questionable due to a strongly contradictory negative Insider Power Score of -42.07. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Mar 11, 2026 Sell	Common Stock S-Sale	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	279 Value: $7K
Mar 11, 2026 Buy	Stock option (right to buy) M-Exempt	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	6 226 Value: $14.9K
Mar 11, 2026 Sell	Common Stock S-Sale	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	17 310 Value: $451.9K
Mar 05, 2026 Sell	Common Stock S-Sale	Cole G Bradley Director	Director	4 748 Value: $135.0K
Mar 05, 2026 Sell	Common Stock S-Sale	Stokes Frank Chief Financial Officer	C-Suite Officer	6 001 Value: $167.9K
Mar 05, 2026 Sell	Common Stock S-Sale	Cole G Bradley Director	Director	2 655 Value: $75.7K
Mar 05, 2026 Buy	Stock option (right to buy) M-Exempt	Cole G Bradley Director	Director	4 748 Value: $16.0K
Mar 05, 2026 Buy	Common Stock M-Exempt	Cole G Bradley Director	Director	4 748 Value: $16.0K
Mar 04, 2026 Buy	Restricted Stock Units M-Exempt	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	27 987 Value: $788.4K
Mar 04, 2026 Sell	Common Stock F-InKind	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	17 931 Value: $505.1K
Mar 04, 2026 Buy	Common Stock M-Exempt	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	59 097 Value: $1.66M
Mar 04, 2026 Buy	Restricted Stock Units M-Exempt	Oelschlager Kristen M Chief Operating Officer	C-Suite Officer	13 811 Value: $389.1K
Mar 04, 2026 Buy	Restricted Stock Units M-Exempt	Oelschlager Kristen M Chief Operating Officer	C-Suite Officer	11 960 Value: $336.9K
Mar 04, 2026 Sell	Common Stock F-InKind	Oelschlager Kristen M Chief Operating Officer	C-Suite Officer	6 792 Value: $191.3K
Mar 04, 2026 Buy	Common Stock M-Exempt	Oelschlager Kristen M Chief Operating Officer	C-Suite Officer	25 771 Value: $726.0K
Mar 04, 2026 Buy	Restricted Stock Units M-Exempt	Juvenal Tobin W Chief Commercial Officer	Officer	13 811 Value: $389.1K
Mar 04, 2026 Buy	Common Stock M-Exempt	Juvenal Tobin W Chief Commercial Officer	Officer	25 771 Value: $726.0K
Mar 04, 2026 Sell	Common Stock F-InKind	Juvenal Tobin W Chief Commercial Officer	Officer	10 399 Value: $292.9K
Mar 04, 2026 Buy	Restricted Stock Units M-Exempt	Juvenal Tobin W Chief Commercial Officer	Officer	11 960 Value: $336.9K
Mar 03, 2026 Sell	Common Stock F-InKind	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	19 043 Value: $525.0K
Mar 03, 2026 Buy	Restricted Stock Units A-Award	Maetzold Derek J Pres. & Chief Exec. Officer	Officer	102 597 Value: $2.83M
Mar 03, 2026 Sell	Common Stock F-InKind	Oelschlager Kristen M Chief Operating Officer	C-Suite Officer	2 427 Value: $66.9K
Mar 03, 2026 Buy	Restricted Stock Units A-Award	Oelschlager Kristen M Chief Operating Officer	C-Suite Officer	48 367 Value: $1.33M
Mar 03, 2026 Sell	Common Stock F-InKind	Juvenal Tobin W Chief Commercial Officer	Officer	3 716 Value: $102.5K
Mar 03, 2026 Buy	Restricted Stock Units A-Award	Juvenal Tobin W Chief Commercial Officer	Officer	48 367 Value: $1.33M

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

ABOUT CASTLE BIOSCIENCES, INC.

Castle Biosciences, Inc., a commercial-stage diagnostics company, focuses to provide diagnostic and prognostic testing services for dermatological cancers. Its lead product is DecisionDx-Melanoma, a multi-gene expression profile (GEP) test to identify the risk of metastasis for patients diagnosed with invasive cutaneous melanoma. The company also offers DecisionDx-UM test, a proprietary GEP test that predicts the risk of metastasis for patients w...

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