Seaport Therapeutics, Inc. (SPTX) IPO — S-1 Filing, Stock & Insider Activity

Seaport Therapeutics, Inc. IPO — Status & S-1 Filing

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Updated Jul 16, 2026 · Last SEC filing 2026-06-24

Seaport Therapeutics, Inc. (SPTX) has filed 15 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-24. 2 Form 8-K material event filings were reported by SPTX in the last 90 days. InsiderAlpha tracks every SPTX SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About Seaport Therapeutics, Inc. (SPTX)

SEC CIK0002042347

90-Day SEC Filing Activity

Form 4 filings (90d)15
Form 8-K filings (90d)2
Latest Form 4 filing2026-06-24

Recent SPTX Insider Transactions (Form 4)

DateInsiderRoleTransactionSharesPriceValueFiling
HOMBACH ROBERT J.InsiderP — Open-market purchase13.0K$18.14$236KSEC
HEALY JAMESInsiderJ — Other acquisition / disposition804.4K——SEC
White LaurenChief Financial OfficerJ — Other acquisition / disposition6.7K——SEC
Gladstein LanaGeneral CounselJ — Other acquisition / disposition33.5K——SEC
Chen Michael CunyuanChief Scientific OfficerJ — Other acquisition / disposition3.4K——SEC
Torres DeniceInsiderJ — Other acquisition / disposition13.4K——SEC
PAUL STEVEN MInsiderJ — Other acquisition / disposition67.0K——SEC
HEALY JAMESInsiderJ — Other acquisition / disposition1.93M——SEC
ARCH Venture Partners XII, LLCInsiderJ — Other acquisition / disposition2.68M——SEC
ARCH Venture Partners XII, LLCInsiderP — Open-market purchase1.10M$18.00$19.80MSEC
Loebel AntonyChief Medical OfficerJ — Other acquisition / disposition20.1K——SEC
PureTech Health plcInsiderJ — Other acquisition / disposition12.74M——SEC
PureTech Health plcInsiderJ — Other acquisition / disposition2.68M——SEC
PureTech Health plcInsiderJ — Other acquisition / disposition965.3K——SEC
ARCH Venture Partners XII, LLCInsiderJ — Other acquisition / disposition2.51M——SEC

All transactions sourced from SEC EDGAR Form 4 filings for Seaport Therapeutics, Inc. (SPTX). Updated in real time as new filings are submitted to the SEC.

Most-Active SPTX Insiders — Last 90 Days

InsiderForm 4 filingsTotal transaction value
PureTech Health plc6—
ARCH Venture Partners XII, LLC5$19.80M
HEALY JAMES4—
PAUL STEVEN M4—
Torres Denice3—

Recent SPTX Form 8-K Material Events

Recent Insider Filings

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in SPTX insider filings:

POpen-market purchase by the insider
SOpen-market sale by the insider
AGrant, award, or other acquisition from the issuer
MExercise or conversion of derivative security (e.g. options)
FPayment of exercise price or tax liability via share withholding
GBona-fide gift of securities
DDisposition to the issuer (e.g. share buyback participation)
JOther acquisition or disposition
XExercise of in-the-money or at-the-money derivative security
CConversion of derivative security
VTransaction voluntarily reported earlier than required

SPTX Insider Trading — FAQ

What is the latest insider trade for SPTX?
Seaport Therapeutics, Inc. (SPTX) had 15 insider filings in the last 90 days, with the most recent on 2026-06-24. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying SPTX stock?
0 insider purchases of SPTX were filed in the last 90 days.
How many insiders are selling SPTX stock?
0 insider sales of SPTX were filed in the last 90 days.
Where can I see SPTX SEC filings (Form 4, 10-K, 10-Q, 8-K)?
InsiderAlpha aggregates every SPTX SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

Learn More

Open the live SPTX dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.