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Institutional ownership intelligence
Schedule 13G/A

DYN Schedule 13G/A filing by T. Rowe Price Investment Management

T. Rowe Price Investment Management reported beneficial ownership of 30.8M shares, representing 18.7% of DYNE THERAPEUTICS INC in this filing.

FiledMay 15, 2026
Ownership dateMar 31, 2026
Reported shares30.8M
Reported ownership18.7%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 30.4M
Shared voting power 30.8M
Sole dispositive power 30.8M
Shared dispositive power 30.8M
Compared with the prior filing

How the reported position changed

This compares the current filing with the previous tracked Schedule 13 filing from the same reporting CIK for DYN. A change between filings does not by itself establish when shares were bought or sold.

Previous filingMar 6, 2026
Reported share change+4,207,364
Ownership percentage change+2.5 pts
Previous filingThis filing
Reported shares26.6M30.8M
Reported ownership16.2%18.7%
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$17.29as of May 15, 2026
Latest tracked price$25.97as of Aug 4, 2026
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
T. Rowe Price Investment Management
CIK
CIK0001897612
Accession
0001897612-26-000494
Form
Schedule 13G/A
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.