Oxana Beskrovnaya

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
11 Dec 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	28.12	2,334	65.63 k	201,685
4 Dec 24	DYN Dyne Therapeutics	Common Stock	Grant	Acquire A	No	No	0	27,400	0.00	204,019
4 Dec 24	DYN Dyne Therapeutics	Common Stock	Grant	Acquire A	No	No	0	39,100	0.00	176,619
4 Dec 24	DYN Dyne Therapeutics	Stock option Common Stock	Grant	Acquire A	No	No	29.44	62,400	1.84 mm	62,400
18 Nov 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	28.2	2,856	80.54 k	137,519
18 Sep 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	34.55	2,339	80.81 k	140,375
11 Sep 24	DYN Dyne Therapeutics	Common Stock	Sell	Dispose S	No	Yes	31.89	2,161	68.91 k	142,714

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