Atlas Venture Life Science Advisors, LLC Long-Term Concentrated

Name: Atlas Venture Life Science Advisors, LLC Q1 2025 13F Filing | 13F Explorer
Creator: Atlas Venture Life Science Advisors, LLC
Published: 2025-05-14

Location: Cambridge, MA

CIK: 0001917529 · Show all filings

Period: Q1 2025 (← Previous) (Next →)

Filing Date: May 14, 2025

Total Value: $522M (100.0% shares, 0.0% debt)

Holdings (13)

KYMR Kymera Therapeutics, Inc. 25.7%

Value $134M Shares 4,896,462 Est. Cost $58.25 Unrealized -37.4%

IRON Disc Medicine, Inc. 22.7%

Value $118M Shares 2,384,456 Est. Cost $48.39 Unrealized +14.9%

DYN Dyne Therapeutics, Inc. 18.3%

Value $95.5M Shares 9,130,465 Est. Cost $13.88 Unrealized +3.1%

DAWN Day One Biopharmaceuticals, Inc. 9.8%

Value $50.99M Shares 6,430,257 Est. Cost $19.68 Unrealized -45.3%

SION Sionna Therapeutics, Inc. 7.4%

Value $38.64M Shares 3,694,020 Est. Cost $16.34 Unrealized 0.0%

— Third Harmonic Bio, Inc. 6.9%

Value $36.1M Shares 10,402,286 Est. Cost $18.97 Unrealized —

KRRO Korro Bio, Inc. 3.8%

Value $19.8M Shares 1,137,149 Est. Cost $33.30 Unrealized -11.0%

— Vigil Neuroscience, Inc. 2.0%

Value $10.39M Shares 5,836,874 Est. Cost $7.03 Unrealized —

— Ikena Oncology, Inc. 1.2%

Value $6.423M Shares 5,018,178 Est. Cost $12.54 Unrealized —

— Aerovate Therapeutics, Inc. 0.9%

Value $4.516M Shares 1,799,232 Est. Cost $11.88 Unrealized —

QTTB Q32 Bio, Inc. 0.7%

Value $3.452M Shares 2,092,106 Est. Cost $13.78 Unrealized -80.5%

— Generation Bio, Co. 0.6%

Value $3.353M Shares 8,279,484 Est. Cost $7.08 Unrealized —

SPRO Spero Therapeutics, Inc. 0.0%

Value $220K Shares 305,255 Est. Cost $15.88 Unrealized -94.7%

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
KYMR	Kymera Therapeutics, Inc.	4,896,462	$134M	25.7%	$58.25	-37.4%	Common Stock	501575104
IRON	Disc Medicine, Inc.	2,384,456	$118M	22.7%	$48.39	+14.9%	Common Stock	254604101
DYN	Dyne Therapeutics, Inc.	9,130,465	$95.5M	18.3%	$13.88	+3.1%	Common Stock	26818M108
DAWN	Day One Biopharmaceuticals, Inc.	6,430,257	$50.99M	9.8%	$19.68	-45.3%	Common Stock	23954D109
SION	Sionna Therapeutics, Inc.	3,694,020	$38.64M	7.4%	$16.34	0.0%	Common Stock	829401108
—	Third Harmonic Bio, Inc.	10,402,286	$36.1M	6.9%	$18.97	—	Common Stock	88427A107
KRRO	Korro Bio, Inc.	1,137,149	$19.8M	3.8%	$33.30	-11.0%	Common Stock	500946108
—	Vigil Neuroscience, Inc.	5,836,874	$10.39M	2.0%	$7.03	—	Common Stock	92673K108
—	Ikena Oncology, Inc.	5,018,178	$6.423M	1.2%	$12.54	—	Common Stock	45175G108
—	Aerovate Therapeutics, Inc.	1,799,232	$4.516M	0.9%	$11.88	—	Common Stock	008064107
QTTB	Q32 Bio, Inc.	2,092,106	$3.452M	0.7%	$13.78	-80.5%	Common Stock	746964105
—	Generation Bio, Co.	8,279,484	$3.353M	0.6%	$7.08	—	Common Stock	37148K100
SPRO	Spero Therapeutics, Inc.	305,255	$220K	0.0%	$15.88	-94.7%	Common Stock	84833T103