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CTMX SCHEDULE 13G/A: SEC filing

An institutional holder

Filed with the SEC on · accession 0000919574-26-005484

CTMX filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 14, 2026. An institutional holder filed an amended Schedule 13G regarding its beneficial ownership position in CytomX Therapeutics. The stock moved +0.3% by the first close after the filing.

Summary of the filing

An institutional holder filed an amended Schedule 13G regarding its beneficial ownership position in CytomX Therapeutics. The filing indicates a change in the holder's ownership stake, though specific details are not disclosed in the available text.

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Key details

IssuerCytomX Therapeutics, Inc.

How CTMX stock reacted

Close before

$3.35

Aug 13, 2026

First close after

+0.30%

$3.36

5 trading days

-1.79%

$3.29

Since filing

-34.63%

$2.19

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Frequently asked questions

What did CTMX file with the SEC on Aug 14, 2026?

CTMX filed a SCHEDULE 13G/A (SEC filing). An institutional holder filed an amended Schedule 13G regarding its beneficial ownership position in CytomX Therapeutics. The filing indicates a change in the holder's ownership stake, though specific details are not disclosed in the available text.

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 CTMX stock react to this filing?

CTMX closed at $3.35 before the filing and $3.36 on Aug 14, 2026 (+0.30%). Five trading days later: $3.29 (-1.79%).

Other CTMX SEC filings

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