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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
1691005	Gatti Susanna High	C/O Dyne Therapeutics, Inc. 1560 Trapelo Road Waltham MA 02451	Chief Operating Officer	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	Disposition	2024-09-18	4,340	$34.41	136,272	No	4	S	Direct
Common Stock	Disposition	2024-09-18	4,636	$34.41	131,636	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Footnotes

Represents shares 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 September 17, 2020. The automatic sale of the Reporting Person's shares is provided for in a restricted stock unit agreement constituting a "binding contract" consistent with the affirmative defense to liability under Rule 10b5-1 and the sale does not represent a discretionary trade by the Reporting Person.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $34.09 to $34.70, 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.
Includes 114,453 unvested RSUs.
The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 11, 2024.