Seaport Therapeutics Ownership & Insider Activity

Seaport Therapeutics (SPTX) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 3.9% of shares outstanding. Institutional investors hold 14.8%.

Shares Outstanding

53.531M

Shares Float

50.936M

Insider Shares Owned

2.114M

Insider % Owned

3.9%

Institutional Shares Held

7.905M

Institutional % Held

14.8%

Ownership Breakdown

Net Insider Activity by Month

Seaport Therapeutics Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Jun 22, 2026	ROBERT HOMBACH	—	BUY	13.000K	$18.14	$236K
May 4, 2026	ARCH Venture Partners XII LLC, ARCH Venture Partners XII LP, ARCH Venture Fund XII LP, KEITH CRANDELL, ROBERT NELSEN, Kristina Burow, STEVEN GILLIS	—	BUY	6.295M	$18.00	$19.8M