EcoR1 Capital’s Dyne Therapeutics DYN Stock Holding History

EcoR1 Capital’s Portfolio DYN Stock Details DYN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q1	–	Sell	-555,644	Closed	-$13.1M	–	51
2024 Q4	$13.1M	Hold	555,644	–	–	0.52%	35
2024 Q3	$20M	Buy	555,644 +128,605	+30%	+$5.12M	0.68%	34
2024 Q2	$15.1M	Hold	427,039	–	–	0.46%	39
2024 Q1	$12.1M	Buy	+427,039	New	+$9.66M	0.31%	42
2023 Q3	–	Sell	-798,701	Closed	-$8.99M	–	53
2023 Q2	$8.99M	Sell	798,701 -1,523,683	-66%	-$18M	0.24%	35
2023 Q1	$26.8M	Hold	2,322,384	–	–	0.86%	17
2022 Q4	$26.9M	Buy	+2,322,384	New	+$26.9M	0.82%	24
2022 Q3	–	Sell	-215,000	Closed	-$1.48M	–	81
2022 Q2	$1.48M	Hold	215,000	–	–	0.05%	63
2022 Q1	$2.07M	Hold	215,000	–	–	0.06%	64
2021 Q4	$2.56M	Hold	215,000	–	–	0.08%	55
2021 Q3	$3.57M	Hold	215,000	–	–	0.13%	48
2021 Q2	$4.52M	Hold	215,000	–	–	0.17%	44
2021 Q1	$3.34M	Hold	215,000	–	–	0.15%	47
2020 Q4	$4.51M	Hold	215,000	–	–	0.25%	43
2020 Q3	$4.34M	Buy	+215,000	New	+$4.72M	0.31%	33

Other funds holding DYN

Janus Henderson Group

Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return

RA Capital Management Boston, Massachusetts $9.44B AUM 157.3% 1-Year Est. Return

Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return

BlackRock New York $5.7T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

FCPM III Services Naarden, Netherlands $722M AUM 73.61% 1-Year Est. Return

Fidelity Investments

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Braidwell Stamford, Connecticut $3B AUM 46.72% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Citadel Advisors

Citadel Advisors Miami, Florida $141B AUM 30.34% 1-Year Est. Return