ARCH Venture Management, LLC

CIK

1274403

City

CHICAGO

State / Country

IL

Stock

GOSS — Gossamer Bio, Inc.

Top Portfolio Positions

10 positions · $677,097,730 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio	Open
MAZE	Maze Therapeutics, Inc. Healthcare	4,120,053	$122,983,582	18.16%
RAPP	Rapport Therapeutics, Inc. Healthcare	3,728,738	$116,672,212	17.23%
VIR	Vir Biotechnology, Inc. Healthcare	12,916,663	$115,733,300	17.09%
ERAS	Erasca, Inc. Healthcare	7,091,557	$114,741,392	16.95%
BEAM	Beam Therapeutics Inc. Healthcare	4,540,132	$108,191,345	15.98%
LYEL	Lyell Immunopharma, Inc. Healthcare	3,247,162	$65,138,069	9.62%
GENB	Generate Biomedicines, Inc. Healthcare	1,944,426	$24,305,325	3.59%
TXG	10x Genomics, Inc. Healthcare	217,834	$4,624,615	0.68%
GOSS	Gossamer Bio, Inc. Healthcare	8,055,916	$2,650,396	0.39%
QTTB	Q32 Bio Inc. Healthcare	320,482	$2,057,494	0.30%

Portfolio Trend

20 quarters · across all stocks

Holdings in GOSS

Compact Export CSV

Shares Held

Position Value (USD)

11 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$2,650,396	8,055,916	0.0%	Shares	Sole	2026-05-15
2025-12-31	$24,973,339	8,055,916	0.0%	Shares	Sole	2026-02-17
2025-09-30	$21,187,059	8,055,916	0.0%	Shares	Sole	2025-11-14
2025-06-30	$9,908,776	8,055,916	0.0%	Shares	Sole	2025-08-14
2025-03-31	$8,861,507	8,055,916	0.0%	Shares	Sole	2025-05-15
2024-12-31	$7,290,603	8,055,916	0.0%	Shares	Sole	2025-02-14
2024-09-30	$7,943,133	8,055,916	0.0%	Shares	Sole	2024-11-14
2024-06-30	$7,258,380	8,055,916	0.0%	Shares	Sole	2024-08-14
2024-03-31	$9,505,980	8,055,916	0.0%	Shares	Sole	2024-05-15
2023-12-31	$7,355,051	8,055,916	0.0%	Shares	Sole	2024-02-14
2023-09-30	$6,710,578	8,055,916	—	Shares	Sole	2023-11-14
No 13F history on record for this holder in this stock.