SEAPORT THERAPEUTICS INC (SPTX)
Institutional ownership reported to the SEC as of Q2 2026, across 1 quarters.
Institutions report 36,164,807 shares against 53,530,550 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| ARCH Venture Management, LLC | $136.6M | 6,294,951 | 12.42% | new | NEW |
| GENERAL ATLANTIC, L.P. | $132.5M | 6,101,582 | 4.56% | new | NEW |
| Sofinnova Investments, Inc. | $77.4M | 3,564,871 | 4.00% | new | NEW |
| GOLDMAN SACHS GROUP INC | $47.3M | 2,178,642 | 0.00% | new | NEW |
| TRV GP VI, LLC | $44.8M | 2,061,222 | 19.27% | new | NEW |
| CANADA PENSION PLAN INVESTMENT BOARD | $42.9M | 1,975,791 | 0.02% | new | NEW |
| JPMORGAN CHASE & CO | $40.9M | 1,815,845 | 0.00% | new | NEW |
| Foresite Capital Management VI LLC | $38.7M | 1,779,521 | 6.02% | new | NEW |
| FMR LLC | $25.7M | 1,185,100 | 0.00% | new | NEW |
| Bellevue Group AG | $23.9M | 1,100,000 | 0.50% | new | NEW |
| Siren, L.L.C. | $23.8M | 1,095,316 | 0.48% | new | NEW |
| JENNISON ASSOCIATES LLC | $23.5M | 1,079,669 | 0.01% | new | NEW |
| RA CAPITAL MANAGEMENT, L.P. | $15.2M | 700,000 | 0.13% | new | NEW |
| VANGUARD CAPITAL MANAGEMENT LLC | $13.0M | 599,217 | 0.00% | new | NEW |
| Woodline Partners LP | $12.7M | 586,345 | 0.04% | new | NEW |
| PERCEPTIVE ADVISORS LLC | $10.9M | 500,000 | 0.16% | new | NEW |
| BRAIDWELL LP | $10.9M | 500,000 | 0.40% | new | NEW |
| PRINCIPAL FINANCIAL GROUP INC | $9.0M | 414,672 | 0.00% | new | NEW |
| Aberdeen Group plc | $6.7M | 310,355 | 0.01% | new | NEW |
| UBS Group AG | $6.1M | 279,184 | 0.00% | new | NEW |
| BlackRock, Inc. | $5.0M | 229,863 | 0.00% | new | NEW |
| SEVEN GRAND MANAGERS, LLC | $4.9M | 225,000 | 0.20% | new | NEW |
| CITADEL ADVISORS LLC | $4.2M | 191,144 | 0.00% | new | NEW |
| GEODE CAPITAL MANAGEMENT, LLC | $3.8M | 175,866 | 0.00% | new | NEW |
| Pier Capital, LLC | $3.7M | 169,985 | 0.49% | new | NEW |
| AMERIPRISE FINANCIAL INC | $2.9M | 131,788 | 0.00% | new | NEW |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $2.1M | 97,693 | 0.00% | new | NEW |
| Sixth Street Partners Management Company, L.P. | $2.1M | 97,693 | 0.00% | new | NEW |
| VANGUARD FIDUCIARY TRUST CO | $1.9M | 87,772 | 0.00% | new | NEW |
| Pentwater Capital Management LP | $1.8M | 83,000 | 0.01% | new | NEW |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $1.8M | 82,565 | 0.00% | new | NEW |
| Alyeska Investment Group, L.P. | $1.6M | 75,000 | 0.00% | new | NEW |
| ALPS ADVISORS INC | $1.2M | 54,328 | 0.01% | new | NEW |
| TD Asset Management Inc | $1.0M | 47,944 | 0.00% | new | NEW |
| MILLENNIUM MANAGEMENT LLC | $984.7K | 45,337 | 0.00% | new | NEW |
| DAFNA Capital Management LLC | $703.7K | 32,400 | 0.13% | new | NEW |
| NORTHERN TRUST CORP | $690.7K | 31,802 | 0.00% | new | NEW |
| ADAR1 Capital Management, LLC | $564.7K | 26,000 | 0.03% | new | NEW |
| Ghisallo Capital Management LLC | $543.0K | 25,000 | 0.01% | new | NEW |
| Burkehill Global Management, LP | $543.0K | 25,000 | 0.02% | new | NEW |
| Squarepoint Ops LLC | $537.6K | 24,753 | 0.00% | new | NEW |
| HighTower Advisors, LLC | $362.0K | 16,666 | 0.00% | new | NEW |
| MORGAN STANLEY | $254.0K | 11,692 | 0.00% | new | NEW |
| XTX Topco Ltd | $238.6K | 10,983 | 0.00% | new | NEW |
| Weiss Asset Management LP | $217.2K | 10,000 | 0.00% | new | NEW |
| Zimmer Partners, LP | $217.2K | 10,000 | 0.01% | new | NEW |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $197.2K | 9,081 | 0.00% | new | NEW |
| Vanguard Global Advisers, LLC | $155.5K | 7,159 | 0.00% | new | NEW |
| CITIGROUP INC | $53.3K | 2,454 | 0.00% | new | NEW |
| JONES FINANCIAL COMPANIES LLLP | $48.3K | 2,256 | 0.00% | new | NEW |
| ASSETMARK, INC | $31.1K | 1,431 | 0.00% | new | NEW |
| PRICE T ROWE ASSOCIATES INC /MD/ | $28.4K | 1,308,604 | 0.00% | new | NEW |
| BARCLAYS PLC | $18.2K | 837 | 0.00% | new | NEW |
| GSA CAPITAL PARTNERS LLP | $721 | 33,178 | 0.05% | new | NEW |
| Integrated Wealth Concepts LLC | $695 | 32 | 0.00% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G | PureTech Health plcwith 2 co-filers | 31.2% |
| 2026-08-05 | 13G | PAUL STEVEN M INDIVIDUAL | 6.3% |
| 2026-08-05 | 13G | Zohar Daphne INDIVIDUAL | 9.1% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 53 | $786.8M | 36,164,807 | 53 | 0 | 0 | 0.0% |