John Cox

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
4 Dec 24	DYN Dyne Therapeutics	Common Stock	Grant	Acquire A	No	No	0	145,300	0.00	150,300
4 Dec 24	DYN Dyne Therapeutics	Stock option Common Stock	Grant	Acquire A	No	No	29.44	232,100	6.83 mm	232,100
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	33.09	7,200	238.25 k	8,000
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	32.57	800	26.06 k	800
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	33.09	7,200	238.25 k	8,000
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	32.57	800	26.06 k	800
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	33.09	7,200	238.25 k	8,000
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	32.57	800	26.06 k	800
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	33.09	7,200	238.25 k	8,000
4 Sep 24	DYN Dyne Therapeutics	Common Stock	Buy	Acquire P	Yes	No	32.57	800	26.06 k	800

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