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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1818794	Dyne Therapeutics Inc.	DYN	Pharmaceutical Preparations (2834)	364883909

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1824673	Jonathan Mcneill	C/O Dyne Therapeutics, Inc. 1560 Trapelo Road Waltham MA 02451	See Remarks	No	Yes	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	2022-03-11	481	$8.73	60,466	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
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 December 10, 2021. 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 that represents the price of all shares sold by a broker on March 11, 2022 to satisfy tax withholding obligations. These shares were sold in multiple transactions at prices within the range of $8.65 to $8.73, 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 this footnote of this Form 4.
Includes 36,489 unvested RSUs.