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Director files Form 144 to sell CSTL shares

Derek Maetzold filed a Form 144 reporting proposed and recent sales of Common stock in connection with transactions routed through Goldman Sachs & Co. LLC.

Filing Impact
(Neutral)
Filing Sentiment

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Form Type
144

Rhea-AI Filing Summary

Derek Maetzold filed a Form 144 reporting proposed and recent sales of Common stock in connection with transactions routed through Goldman Sachs & Co. LLC. The filing lists multiple open-market disposals, including 23,179 shares for $584,548.88 on 03/12/2026 and 18,650 shares for $482,441.93 on 03/17/2026.

The excerpt also shows prior cashless exercises and same-day sales tied to 6,764 stock options dated 11/12/2018, and numerous trust-held share dispositions across March–April 2026.

Insights

Form 144 lists multiple planned and executed sales by an insider and related trusts.

The entry documents sizeable open-market dispositions by Derek Maetzold and affiliated trusts, with specific trades such as $584,548.88 for 23,179 shares on 03/12/2026. The filing also references a prior cashless exercise / same-day sale of 6,764 options dated 11/12/2018.

Cash‑flow treatment and whether sales were under a pre-arranged plan are not specified in the excerpt; subsequent filings or broker reports may provide additional details on proceeds and sale mechanics.

Block sale 23,179 shares 03/12/2026 for $584,548.88
Block sale 18,650 shares 03/17/2026 for $482,441.93
Block sale 13,204 shares 03/13/2026 for $335,209.95
Option exercise / sale 6,764 options 11/12/2018 — Compensation; cashless exercise / same-day sale
Large single-day sales 23,179; 18,650; 17,575 shares Multiple dates in March 2026
Form 144 regulatory
"144: Securities To Be Sold"
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.
cashless exercise / same-day sale financial
"Compensation -- Cashless exercise / same-day sale"
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.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR

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

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