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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

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2024-09-04	800	$32.57	800	No	4	P	Indirect	By Trust #1
Common Stock	Acquisiton	2024-09-04	7,200	$33.09	8,000	No	4	P	Indirect	By Trust #1
Common Stock	Acquisiton	2024-09-04	800	$32.57	800	No	4	P	Indirect	By Trust #2
Common Stock	Acquisiton	2024-09-04	7,200	$33.09	8,000	No	4	P	Indirect	By Trust #2
Common Stock	Acquisiton	2024-09-04	800	$32.57	800	No	4	P	Indirect	By Trust #3
Common Stock	Acquisiton	2024-09-04	7,200	$33.09	8,000	No	4	P	Indirect	By Trust #3
Common Stock	Acquisiton	2024-09-04	800	$32.57	800	No	4	P	Indirect	By Trust #4
Common Stock	Acquisiton	2024-09-04	7,200	$33.09	8,000	No	4	P	Indirect	By Trust #4

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Trust #1
No	4	P	Indirect	By Trust #1
No	4	P	Indirect	By Trust #2
No	4	P	Indirect	By Trust #2
No	4	P	Indirect	By Trust #3
No	4	P	Indirect	By Trust #3
No	4	P	Indirect	By Trust #4
No	4	P	Indirect	By Trust #4

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	5,000	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices within the range of $32.55 to $32.60, 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(s) set forth in the footnotes of this Form 4.
These shares are held in a trust for the benefit of a child of the Reporting Person.
The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices within the range of $32.60 to $33.58, inclusive.