CSTL 8-K: SEC filing
Castle Biosciences
Filed with the SEC on · accession 0001628280-26-071030
CSTL filed a 8-K (current report) with the SEC on Nov 5, 2026. Castle Biosciences issued a press release and slide presentation announcing its financial results for the third quarter ended September 30, 2026. The stock moved -4.3% by the first close after the filing.
Summary of the filing
Castle Biosciences issued a press release and slide presentation announcing its financial results for the third quarter ended September 30, 2026. The filing is a routine quarterly earnings disclosure under Items 2.02 and 7.01.
Key details
How CSTL stock reacted
Close before
$35.75
Nov 4, 2026
First close after
-4.34%
$34.20
5 trading days
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Since filing
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Click hereFrequently asked questions
What did CSTL file with the SEC on Nov 5, 2026?
CSTL filed a 8-K (SEC filing). Castle Biosciences issued a press release and slide presentation announcing its financial results for the third quarter ended September 30, 2026. The filing is a routine quarterly earnings disclosure under Items 2.02 and 7.01.
How do I read a 8-K?
A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The "Item" number tells you the topic (e.g. 2.02 results, 5.02 executive change, 1.01 new agreement, 1.03 bankruptcy). Exhibits (99.1 press release) usually hold the details.
Why are SEC filings important?
Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 8-K (current report): A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more.
How did CSTL stock react to this filing?
CSTL closed at $35.75 before the filing and $34.20 on Nov 5, 2026 (-4.34%).
Other CSTL SEC filings
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