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  4. [144] CASTLE BIOSCIENCES INC SEC Filing

Maetzold-related trusts sell shares (CSTL) in multiple Form 144 trades

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
144

Rhea-AI Filing Summary

The filing reports multiple Rule 144-related dispositions of common stock by entities and trusts associated with Derek Maetzold, with sizeable blocks sold across March–May 2026. Representative transactions include a sale of 23,179 shares on 03/12/2026 and repeated smaller trust sales; proceeds are shown per trade.

Positive

  • None.

Negative

  • None.

Insights

Multiple structured trust dispositions reported under Rule 144; sales are detailed by date and amount.

The excerpt lists numerous dispositions of common stock by trusts and by an individual associated with Derek Maetzold, with trade dates from 03/11/2026 through 05/21/2026. Each row shows share counts and gross proceeds for the specific transaction.

Cash‑flow treatment is shown per trade as gross proceeds; the filing attributes sales to identified trusts and the reporting individual. Subsequent filings or Form 4/5 entries may provide additional ownership context.

Largest single trade shown 23,179 shares sale on <date>03/12/2026</date>
Proceeds for 23,179-share trade $584,548.88 gross proceeds reported on <date>03/12/2026</date>
Other March 2026 block sales 18,650 shares; $482,441.93 sale on <date>03/17/2026</date>
Notable March 2026 sale 17,575 shares; $455,350.68 sale on <date>03/16/2026</date>
Large April/May aggregated single-day sales 6,214 shares; $155,156.64 sale on <date>04/06/2026</date>
Example small trust sale 83 shares; $2,179.94 sale on <date>03/11/2026</date>
Cashless exercise / same-day sale financial
"Compensation -- Cashless exercise / same-day sale"
Remainder Trust legal
"The Maetzold 2018 Remainder Trust f/b/o Peter Douglas Maetzold"
Irrevocable Trust legal
"Derek Maetzold 2020 Irrevocable Trust dtd 12/04/2020"
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
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144: Filer Information

144: Issuer Information

144: Securities Information



Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold


* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.



Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

144: Remarks and Signature

Source: View Original Filing on SEC EDGAR

FAQ

What does the Form 144 for CSTL show about Derek Maetzold's sales?

It shows multiple sales by trusts and Derek Maetzold totaling many transactions during Mar–May 2026. The excerpt lists trade dates, per‑trade share counts (e.g., 23,179 shares) and gross proceeds for each sale.

Are the sales reported by trusts or by Derek Maetzold personally?

Both: the excerpt lists dispositions by named trusts (e.g., The Maetzold 2018 Remainder Trust) and by Derek Maetzold directly. Each line identifies the selling holder before the share count and proceeds.

What are some large individual transactions disclosed in the filing?

Representative large trades include a sale of 23,179 shares for $584,548.88 on 03/12/2026 and several multi‑thousand share sales in March 2026. Each trade in the excerpt shows share count and gross proceeds.

Does the excerpt show how proceeds will be used by the issuer?

No. The entries list gross proceeds per transaction to the selling holders; the excerpt does not state that the issuer receives any proceeds or specify use of proceeds.