Jonathan McNeill

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
19 Aug 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	46	305	14.03 k	132,106
19 Aug 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	45.01	2,400	108.02 k	132,411
11 Jun 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	31.34	1,823	57.13 k	134,811
16 May 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	28.59	495	14.15 k	136,634
16 May 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	28.2	2,279	64.27 k	137,129
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	25.71	1,776	45.66 k	139,408
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	25.48	17,825	454.18 k	141,184
11 Mar 24	DYN Dyne Therapeutics	Common Stock	Option exercise	Acquire M	No	No	5.54	17,825	98.75 k	159,009
11 Mar 24	DYN Dyne Therapeutics	Stock option Common Stock	Option exercise	Dispose M	No	No	5.54	17,825	98.75 k	0
8 Mar 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	No	27.31	689	18.82 k	141,184

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