Seaport Therapeutics, Inc. (SPTX)

Nasdaq: SPTX · Pharmaceutical Preparations · filing with the SEC since 2024

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Grade5.8

◀ Past 6.0● Present 6.7▶ Future 5.0

8 est.

Overview Business Financials Grade Forecast Sentiment Ownership People Filings Patents Chart

Who owns Seaport Therapeutics, Inc.

As filed with the SEC

Holders of 5% or more

PureTech Health plc holds 31.2% of Voting Common Stock, $0.001 par value per share, as its SCHEDULE 13G filed Aug 14, 2026 says.

Directors and officers

report now, of 27 people on the record since 2026. Their holdings as a group are not read here.

Institutions as a whole

n/a

The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 6 named at left.

Holders of 5% or moreshare of the class, as filed

PureTech Health plc

SCHEDULE 13G · filed Aug 14, 2026 · Voting Common Stock, $0.001 par value per share

31.2%

ARCH Venture Fund XII, L.P.

SCHEDULE 13D · filed May 6, 2026 · Common Stock, $0.0001 par value

11.9%

General Atlantic, L.P.

SCHEDULE 13D · filed May 11, 2026 · Common stock, par value $0.0001 per share

11.5%

Zohar Daphne

SCHEDULE 13G · filed Aug 5, 2026 · Voting Common Stock, $0.0001 par value per share

9.1%

Paul Steven M

SCHEDULE 13G · filed Aug 5, 2026 · Voting Common Stock, $0.0001 par value per share

6.3%

Goldman Sachs Group Inc.

SCHEDULE 13G · filed May 11, 2026 · Voting Common Stock, $0.0001 par value per share

5.5%

What SPTX reports owning in othersstakes of 5% or more, and other ties

Seaport Therapeutics, Inc. reports no stake in another company in the record.

Insider tradesForm 4

0sales

2purchases

0sales on a scheduled plan

0people selling

$0sold, in dollars

$300,000bought, in dollars

Open-market trades on Form 4 from Nov 4, 2025 to Nov 4, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.

By calendar yearSoldBought

2026 runs to Nov 4, 2026. Dollars as filed, summed by the transaction date.

People who traded in the window3 of 36 on the roster

Person	Role as filed	Sold	Buys	Bought
Torres Denice	director	$0	1	$100,000
Hombach Robert J.	director	$0	1	$200,000
Arch Venture Partners Xii, L.P.	10% owner	$0	1	$19.8M

SI Assistanton SPTX · research, not advice