ARCH Venture Partners XII, LLC

10% Owner · 1 filing · Latest: May 4, 2026

Seaport Therapeutics, Inc.

Ticker	Owner	Relationship	Date	Transaction	Cost	#Shares	Value ($)	#Shares Total	SEC Form 4
SPTX	ARCH Venture Partners XII, LLC	10% Owner	May 4, 2026	Purchase	$18.00	1,100,000	$19.8M	6,294,951	May 4 6:02 PM
SPTX	ARCH Venture Partners XII, LLC	10% Owner	May 4, 2026	Conversion	—	5,194,951	—	5,194,951	May 4 6:02 PM