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  4. [144] CASTLE BIOSCIENCES INC SEC Filing

Maetzold family Rule 144 sales reported for CSTL (CSTL) — multiple small lots

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

Rhea-AI Filing Summary

Multiple Rule 144 sale notices report transactions by Derek Maetzold and related trusts. The filings list numerous small open-market dispositions of Common shares carried out across April–June 2026 by trusts and entities associated with Maetzold. Examples include sales of 6,214 shares for $155,156.64 and 1,357 shares for $29,981.21 on the dates shown in the excerpt. The entries identify trusts (e.g., The Maetzold 2018 Remainder Trust, The Maetzold Descendants 2020 Trust) and an irrevocable trust as selling holders. Payment amounts are shown per sale line; the filing reports repeated, modest transactions over multiple dates.

Positive

  • None.

Negative

  • None.

Insights

Rule 144 notices record routine restricted‑stock resale activity by related trusts.

These entries list multiple dated dispositions under Rule 144 by trusts and related entities. The excerpts show per‑transaction share counts and gross amounts, and identify the selling entities by trust name and address.

Transaction timing and method details are limited to the dated sale rows; cash‑flow recipients and any holding‑period compliance statements are not quoted in the excerpt. Subsequent filings or broker confirmations would clarify settlement and broker details.

Sales are granular and distributed across small lots — not a single large block.

The reported rows show many small sales (examples: 6,214 shares and 1,357 shares) executed on multiple dates between April and June 2026. Each row pairs a share count with a dollar figure.

Because the excerpt lists many modest transactions by related trusts, the filings suggest routine liquidity events rather than a concentrated liquidation; aggregate impact cannot be assessed from the provided rows alone.

Example sale — Derek Maetzold 6,214 shares 04/06/2026 sale line showing $155,156.64
Example sale — Maetzold Descendants Trust 1,357 shares 05/07/2026 sale line showing $29,981.21
Small lot example 278 shares Multiple dated sale lines (e.g., 04/06/2026) showing amounts such as $6,941.34
Irrevocable trust sale 1,153 shares Multiple dated sale lines (e.g., 04/06/2026) showing amounts such as $28,789.12
Filing form Form 144 Rule 144 notice for resale of restricted/controlled securities
Rule 144 regulatory
"multiple dated sale rows and the filing form label"
Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.
Form 144 regulatory
"header/metadata indicating the filing type"
Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.
Remainder Trust legal
"The Maetzold 2018 Remainder Trust f/b/o John Derek 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.
Cashless exercise / same-day sale financial
"Compensation -- Cashless exercise / same-day sale"
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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 filing for CSTL show about Maetzold family sales?

The filing shows multiple Rule 144 sale notices by Derek Maetzold and related trusts. It lists dated transactions with per‑line share counts and dollar amounts, including entries across April–June 2026, identifying each selling trust and the number of shares sold.

How large were some individual Maetzold trust sales reported in the excerpt?

Individual sale lines in the excerpt include modest lots such as 6,214 shares for $155,156.64 and 1,357 shares for $29,981.21. Each line pairs a specific share count with a cash amount for that transaction date.

Which entities are named as sellers in these CSTL Form 144 rows?

The excerpt names trusts and trusts for beneficiaries, for example: The Maetzold 2018 Remainder Trust, The Maetzold Descendants 2020 Trust, and Derek Maetzold 2020 Irrevocable Trust, each shown with an address and dated sale rows.

Does the excerpt state aggregate shares sold or total proceeds?

The provided rows list per‑transaction share counts and proceeds but do not present an explicit aggregate total in the excerpt. Aggregate impact is not calculated within these lines.