Atlas Venture Life Science Advisors, LLC

CIK

1917529

City

CAMBRIDGE

State / Country

MA

Stock

DAWN — Day One Biopharmaceuticals, Inc.

Top Portfolio Positions

6 positions · $790,032,313 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio	Open
KYMR	Kymera Therapeutics, Inc. Healthcare	4,578,008	$381,302,286	48.26%
DYN	Dyne Therapeutics, Inc. Healthcare	9,130,465	$165,535,330	20.95%
SION	Sionna Therapeutics, Inc. Healthcare	2,995,602	$120,093,684	15.20%
IRON	Disc Medicine, Inc. Healthcare	1,513,875	$96,797,167	12.25%
QTTB	Q32 Bio Inc. Healthcare	2,092,106	$13,431,320	1.70%
KRRO	Korro Bio, Inc. Healthcare	1,137,149	$12,872,526	1.63%

Portfolio Trend

18 quarters · across all stocks

Holdings in DAWN

Compact Export CSV

Shares Held

Position Value (USD)

17 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2025-12-31	$59,765,059	6,412,560	-0.3%	Shares	Sole	2026-02-13
2025-09-30	$45,333,311	6,430,257	0.0%	Shares	Sole	2025-11-13
2025-06-30	$41,796,670	6,430,257	0.0%	Shares	Sole	2025-08-12
2025-03-31	$50,991,938	6,430,257	0.0%	Shares	Sole	2025-05-14
2024-12-31	$81,471,356	6,430,257	0.0%	Shares	Sole	2025-02-06
2024-09-30	$89,573,480	6,430,257	0.0%	Shares	Sole	2024-11-13
2024-06-30	$88,608,941	6,430,257	0.0%	Shares	Sole	2024-08-09
2024-03-31	$106,227,845	6,430,257	-15.5%	Shares	Sole	2024-05-06
2023-12-31	$111,082,552	7,608,394	0.0%	Shares	Sole	2024-02-09
2023-09-30	$93,354,994	7,608,394	0.0%	Shares	Sole	2023-11-13
2023-06-30	$90,844,224	7,608,394	0.0%	Shares	Sole	2023-08-11
2023-03-31	$101,724,227	7,608,394	+0.5%	Shares	Sole	2023-05-15
2022-12-31	$162,870,181	7,568,317	-7.4%	Shares	Sole	2023-02-14
2022-09-30	$163,628,495	8,169,171	-8.9%	Shares	Sole	2022-11-09
2022-06-30	$160,532,659	8,968,305	+9.3%	Shares	Sole	2022-08-03
2022-03-31	$81,360,248	8,201,638	0.0%	Shares	Sole	2022-05-16
2021-12-31	$138,197,600	8,201,638	—	Shares	Sole	2022-05-16
No 13F history on record for this holder in this stock.