CMPX SCHEDULE 13G/A: SEC filing
Compass Therapeutics, Inc.
Filed with the SEC on · accession 0001213900-26-089989
CMPX filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 14, 2026. Compass Therapeutics, Inc. filed a Schedule 13G/A amendment, indicating a change in ownership position by an institutional or passive investor. The stock moved -0.4% by the first close after the filing.
Summary of the filing
Compass Therapeutics, Inc. filed a Schedule 13G/A amendment, indicating a change in ownership position by an institutional or passive investor. The filing text provided contains only the EDGAR directory listing and no substantive ownership details.
How CMPX stock reacted
Close before
$2.26
Aug 13, 2026
First close after
-0.44%
$2.25
5 trading days
+4.65%
$2.37
Since filing
-66.42%
$0.76
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Click hereFrequently asked questions
What did CMPX file with the SEC on Aug 14, 2026?
CMPX filed a SCHEDULE 13G/A (SEC filing). Compass Therapeutics, Inc. filed a Schedule 13G/A amendment, indicating a change in ownership position by an institutional or passive investor. The filing text provided contains only the EDGAR directory listing and no substantive ownership details.
How do I read a SCHEDULE 13G/A?
A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.
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 SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).
How did CMPX stock react to this filing?
CMPX closed at $2.26 before the filing and $2.25 on Aug 14, 2026 (-0.44%). Five trading days later: $2.37 (+4.65%).
Other CMPX SEC filings
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