Atlas Venture Life Science Advisors, LLC Long-Term Concentrated

CIK: 0001917529 · Show all filings

Period: Q3 2025 (← Previous) (Next →)

Filing Date: Nov 13, 2025

Total Value ($000): $752,637 (100.0% shares, 0.0% debt)

Holdings (9)

KYMR Kymera Therapeutics, Inc. 36.8%

Value ($000) $277,140 Shares 4,896,462 Est. Cost $58.25 Unrealized -22.6%

IRON Disc Medicine, Inc. 18.8%

Value ($000) $141,584 Shares 2,142,617 Est. Cost $48.39 Unrealized +22.9%

DYN Dyne Therapeutics, Inc. 15.3%

Value ($000) $115,500 Shares 9,130,465 Est. Cost $13.88 Unrealized -17.8%

SION Sionna Therapeutics, Inc. 14.1%

Value ($000) $106,333 Shares 3,615,527 Est. Cost $16.34 Unrealized +33.1%

KRRO Korro Bio, Inc. 7.2%

Value ($000) $54,458 Shares 1,137,149 Est. Cost $33.30 Unrealized -33.4%

DAWN Day One Biopharmaceuticals, Inc. 6.0%

Value ($000) $45,333 Shares 6,430,257 Est. Cost $19.68 Unrealized -65.0%

— Generation Bio, Co. 0.7%

Value ($000) $5,067 Shares 827,946 Est. Cost $7.08 Unrealized —

QTTB Q32 Bio, Inc. 0.6%

Value ($000) $4,142 Shares 2,092,106 Est. Cost $13.78 Unrealized -86.1%

IMA ImageneBio, Inc. 0.4%

Value ($000) $3,079 Shares 377,814 Est. Cost $13.25 Unrealized 0.0%

Ticker	Issuer	Shares	Value ($000)	%	Est. Cost	Unrealized	Class	CUSIP
KYMR	Kymera Therapeutics, Inc.	4,896,462	$277,140	36.8%	$58.25	-22.6%	Common Stock	501575104
IRON	Disc Medicine, Inc.	2,142,617	$141,584	18.8%	$48.39	+22.9%	Common Stock	254604101
DYN	Dyne Therapeutics, Inc.	9,130,465	$115,500	15.3%	$13.88	-17.8%	Common Stock	26818M108
SION	Sionna Therapeutics, Inc.	3,615,527	$106,333	14.1%	$16.34	+33.1%	Common Stock	829401108
KRRO	Korro Bio, Inc.	1,137,149	$54,458	7.2%	$33.30	-33.4%	Common Stock	500946108
DAWN	Day One Biopharmaceuticals, Inc.	6,430,257	$45,333	6.0%	$19.68	-65.0%	Common Stock	23954D109
—	Generation Bio, Co.	827,946	$5,067	0.7%	$7.08	—	Common Stock	37148K100
QTTB	Q32 Bio, Inc.	2,092,106	$4,142	0.6%	$13.78	-86.1%	Common Stock	746964105
IMA	ImageneBio, Inc.	377,814	$3,079	0.4%	$13.25	0.0%	Common Stock	45175G207