Joshua T Brumm

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	25.93	8,618	223.46 k	537,998
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	26.12	7,769	202.93 k	546,616
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	26.1	9,928	259.12 k	554,385
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	25.42	40,072	1.02 mm	564,313
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Option exercise	Acquire M	No	No	5.54	50,000	277.00 k	604,385
11 Mar 24	DYN Dyne Therapeutics	Stock option Common Stock	Option exercise	Dispose M	No	No	5.54	50,000	277.00 k	83,269
8 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	27.38	435	11.91 k	554,385
8 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	26.72	160,670	4.29 mm	554,820
8 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	25.3	202,238	5.12 mm	715,490
8 Mar 24	DYN Dyne Therapeutics	Common Stock	Option exercise	Acquire M	No	No	5.54	209,412	1.16 mm	917,728

Data from 3, 4 and 5 filings. Values as filed, not updated for current price.