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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1818794	Dyne Therapeutics Inc.	DYN	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1498428	John Cox	C/O Dyne Therapeutics, Inc. 1560 Trapelo Road Waltham MA 02451	Ceo & President	No	No	No	No

Transaction Summary

Purchased:	100,000 shares	Avg. Price: $9.11	Total Value: $911,000.00
Number of Shares After Transactions:	202,179 shares

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2025-07-14	100,000	$9.11	242,179	No	4	P	Direct
Common Stock	Disposition	2025-07-15	10,000	$0.00	232,179	No	4	G	Direct
Common Stock	Disposition	2025-07-15	10,000	$0.00	222,179	No	4	G	Direct
Common Stock	Disposition	2025-07-15	10,000	$0.00	212,179	No	4	G	Direct
Common Stock	Disposition	2025-07-15	10,000	$0.00	202,179	No	4	G	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	P	Direct
No	4	G	Direct
No	4	G	Direct
No	4	G	Direct
No	4	G	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	18,000	Indirect	By Trust #1
Common Stock	18,000	Indirect	By Trust #2
Common Stock	18,000	Indirect	By Trust #3
Common Stock	18,000	Indirect	By Trust #4

Footnotes

The Reporting Person's purchase of shares of Common Stock reported herein was matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), to the extent of 8,121 shares, with the Reporting Person's sale of 4,061 shares on March 5, 2025 and 4,060 shares on June 5, 2025 automatically sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting of restricted stock units granted to the Reporting Person on December 4, 2024. The Reporting Person has paid to the Issuer an aggregate amount of $29,017.22, representing the amount of the profit deemed realized in connection with the short-swing transaction under Section 16(b) of the Exchange Act.
The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices within the range of $9.02 to $9.15, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote of this Form 4.
This transaction represents a gift by the Reporting Person to a trust established for the benefit of a child of the Reporting Person.
These shares of Common Stock are held in a trust for the benefit of a child of the Reporting Person.
Includes 127,138 unvested RSUs.