Atlas Venture Fund XI, L.P.

13D and 13G Filings

13D/G filings: 13D on 2 securities, 13G on 2 securities
Location: Cambridge, MA
CIK: 0001708269
Form D filings: 1 filing
All SEC filings: View on sec.gov

Issuer	Symbol	CUSIP	% of Class	Shares	Form	Filed
Dyne Therapeutics, Inc. 13G/A Amendment 6 DYN · 26818M108	DYN	26818M108	2.4%	4,479,449	13G/A Amendment 6	8/13/2026 Event 6/30/2026
Atlas Venture Fund XI, L.P.			2.4%	4,476,487
Atlas Venture Associates XI, L.P.			2.4%	4,479,449
Atlas Venture Associates XI, LLC			2.4%	4,479,449
Atlas Venture Opportunity Fund I, L.P.			0.5%	975,931
Atlas Venture Associates Opportunity I, L.P.			0.5%	975,931
Atlas Venture Associates Opportunity I, LLC			0.5%	975,931
Atlas Venture Opportunity Fund II, L.P.			0.7%	1,344,719
Atlas Venture Associates Opportunity II, L.P.			0.7%	1,344,719
Atlas Venture Associates Opportunity II, LLC			0.7%	1,344,719
Korro Bio, Inc. 13D/A Amendment 1 KRRO · 500946108	KRRO	500946108	4.9%	706,556	13D/A Amendment 1	8/4/2026 Event 6/24/2026
Atlas Venture Fund XI, L.P.			4.9%	706,556
Atlas Venture Associates XI, L.P.			4.9%	706,556
Atlas Venture Associates XI, LLC			4.9%	706,556
Atlas Venture Opportunity Fund II, L.P.			1.0%	146,305
Atlas Venture Associates Opportunity II, L.P.			1.0%	146,305
Atlas Venture Associates Opportunity II, LLC			1.0%	146,305
Day One Biopharmaceuticals, Inc. 13G/A Amendment 4 DAWN · 23954D109	DAWN	23954D109	0%	0	13G/A Amendment 4	5/14/2026 Event 3/31/2026
Atlas Venture Fund XI, L.P.			0%	0
Atlas Venture Associates XI, L.P.			0%	0
Atlas Venture Associates XI, LLC			0%	0
Atlas Venture Opportunity Fund I, L.P.			0%	0
Atlas Venture Associates Opportunity I, L.P.			0%	0
Atlas Venture Associates Opportunity I, LLC			0%	0
Atlas Venture Opportunity Fund II, L.P.			0%	0
Atlas Venture Associates Opportunity II, L.P.			0%	0
Atlas Venture Associates Opportunity II, LLC			0%	0
Dyne Therapeutics, Inc. 13G/A Amendment 5 DYN · 26818M108	DYN	26818M108	4.0%	5,713,470	13G/A Amendment 5	11/13/2025 Event 9/30/2025
Atlas Venture Fund XI, L.P.			4.0%	5,697,508
Atlas Venture Associates XI, L.P.			4.0%	5,713,470
Atlas Venture Associates XI, LLC			4.0%	5,713,470
Atlas Venture Opportunity Fund I, L.P.			1.0%	1,458,568
Atlas Venture Associates Opportunity I, L.P.			1.0%	1,458,568
Atlas Venture Associates Opportunity I, LLC			1.0%	1,458,568
Atlas Venture Opportunity Fund II, L.P.			1.4%	1,958,427
Atlas Venture Associates Opportunity II, LP			1.4%	1,958,427
Atlas Venture Associates Opportunity II, LLC			1.4%	1,958,427
Sionna Therapeutics, Inc. 13D/A Amendment 1 SION · 829401108	SION	829401108	5.4%	2,382,495	13D/A Amendment 1	10/20/2025 Event 10/16/2025
Atlas Venture Fund XI, L.P.			5.4%	2,382,495
Atlas Venture Associates XI, L.P.			5.4%	2,382,495
Atlas Venture Associates XI, LLC			5.4%	2,382,495
Atlas Venture Opportunity Fund II, L.P.			1.6%	701,985
Atlas Venture Associates Opportunity II, LP			1.6%	701,985
Atlas Venture Associates Opportunity II, LLC			1.6%	701,985
Sionna Therapeutics, Inc. 13D SION · 829401108	SION	829401108	6.5%	2,886,293	13D	2/18/2025 Event 2/10/2025
Atlas Venture Fund XI, L.P.			6.5%	2,886,293
Atlas Venture Associates XI, L.P.			6.5%	2,886,293
Atlas Venture Associates XI, LLC			6.5%	2,886,293
Atlas Venture Opportunity Fund II, L.P.			1.8%	807,727
Atlas Venture Associates Opportunity II, LP			1.8%	807,727
Atlas Venture Associates Opportunity II, LLC			1.8%	807,727

Includes filings since 12/18/2024, when the SEC began requiring structured 13D and 13G data.