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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
1528826	T Joshua Brumm	C/O Dyne Therapeutics, Inc. 1560 Trapelo Road Waltham MA 02451	See Remarks	Yes	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
Common Stock	Disposition	2023-06-08	20,000	$0.00	302,483	No	4	G	Direct
Common Stock	Disposition	2023-06-08	1,800	$0.00	300,683	No	4	G	Direct
Common Stock	Acquisiton	2023-06-08	30,088	$1.03	330,771	No	4	M	Direct
Common Stock	Disposition	2023-06-08	46,811	$13.15	283,960	No	4	S	Direct
Common Stock	Disposition	2023-06-08	14,189	$13.47	269,771	No	4	S	Direct
Common Stock	Acquisiton	2023-06-09	76,582	$1.03	346,353	No	4	M	Direct
Common Stock	Disposition	2023-06-09	76,582	$13.34	269,771	No	4	S	Direct
Common Stock	Acquisiton	2023-06-12	171,360	$1.03	441,131	No	4	M	Direct
Common Stock	Disposition	2023-06-12	187,748	$12.61	253,383	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2023-06-08	30,088	$0.00	30,088	$1.03
Common Stock	Stock Option (right to buy)	Disposition	2023-06-09	76,582	$0.00	76,582	$1.03
Common Stock	Stock Option (right to buy)	Disposition	2023-06-12	171,360	$0.00	171,360	$1.03

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
317,661	2030-01-05	No	4	M	Direct
241,079	2030-01-05	No	4	M	Direct
69,719	2023-01-05	No	4	M	Direct

Footnotes

This transaction was a charitable donation to a third party effective June 8, 2023 in which no value was received in return.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $13.10 to $13.23, 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 ranges set forth in footnotes (1) and (2) of this Form 4.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $13.24 to $14.22, inclusive.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $13.00 to $13.64, inclusive.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices within the range of $12.18 to $13.14, inclusive.
The option was granted on January 6, 2020. The shares underlying the option vest over four years, with 25% of the shares vesting on October 12, 2020 and the remaining shares vesting in equal quarterly installments thereafter.