DYN SCHEDULE 13G/A: SEC filing

An institutional holder

Filed with the SEC on Aug 13, 2026 · accession 0001274173-26-000206

DYN filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 13, 2026. An institutional holder filed an amended Schedule 13G for Dyne Therapeutics, Inc. (DYN), indicating a change in its passive ownership position. The stock moved -0.8% by the first close after the filing.

Summary of the filing

An institutional holder filed an amended Schedule 13G for Dyne Therapeutics, Inc. (DYN), indicating a change in its passive ownership position. The filing includes a power of attorney and the primary ownership document.

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Key details

IssuerDyne Therapeutics, Inc.

How DYN stock reacted

Close before

$26.17

Aug 12, 2026

First close after

-0.80%

$25.96

5 trading days

+2.33%

$26.78

Since filing

-30.95%

$18.07

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Frequently asked questions

What did DYN file with the SEC on Aug 13, 2026?

DYN filed a SCHEDULE 13G/A (SEC filing). An institutional holder filed an amended Schedule 13G for Dyne Therapeutics, Inc. (DYN), indicating a change in its passive ownership position. The filing includes a power of attorney and the primary ownership document.

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 DYN stock react to this filing?

DYN closed at $26.17 before the filing and $25.96 on Aug 13, 2026 (-0.80%). Five trading days later: $26.78 (+2.33%).

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