SPTX Seaport Therapeutics, Inc.
Seaport Therapeutics, Inc. (SPTX) Institutional Ownership
What the institutions did with SPTX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| ARCH Venture Management, LLC | 6.3M | 16.8% |
| GENERAL ATLANTIC, L.P. | 6.1M | 16.3% |
| Sofinnova Investments, Inc. | 3.6M | 9.5% |
| GOLDMAN SACHS GROUP INC | 2.2M | 5.8% |
| TRV GP VI, LLC | 2.1M | 5.5% |
| CANADA PENSION PLAN INVESTMENT BOARD | 2.0M | 5.3% |
| JPMORGAN CHASE & CO | 1.8M | 4.8% |
| Foresite Capital Management VI LLC | 1.8M | 4.7% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.3M | 3.5% |
| FMR LLC | 1.2M | 3.2% |
| Bellevue Group AG | 1.1M | 2.9% |
| Siren, L.L.C. | 1.1M | 2.9% |
| JENNISON ASSOCIATES LLC | 1.1M | 2.9% |
| RA CAPITAL MANAGEMENT, L.P. | 700.0K | 1.9% |
| VANGUARD CAPITAL MANAGEMENT LLC | 599.2K | 1.6% |
| Woodline Partners LP | 586.3K | 1.6% |
| PERCEPTIVE ADVISORS LLC | 500.0K | 1.3% |
| BRAIDWELL LP | 500.0K | 1.3% |
| PRINCIPAL FINANCIAL GROUP INC | 414.7K | 1.1% |
| Aberdeen Group plc | 310.4K | 0.8% |
| UBS Group AG | 279.2K | 0.7% |
| BlackRock, Inc. | 229.9K | 0.6% |
| SEVEN GRAND MANAGERS, LLC | 225.0K | 0.6% |
| CITADEL ADVISORS LLC | 191.1K | 0.5% |
| GEODE CAPITAL MANAGEMENT, LLC | 175.9K | 0.5% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| ARCH Venture Management, LLC | New | 0 | 6.3M | +6.3M |
| GENERAL ATLANTIC, L.P. | New | 0 | 6.1M | +6.1M |
| Sofinnova Investments, Inc. | New | 0 | 3.6M | +3.6M |
| GOLDMAN SACHS GROUP INC | New | 0 | 2.2M | +2.2M |
| TRV GP VI, LLC | New | 0 | 2.1M | +2.1M |
| CANADA PENSION PLAN INVESTMENT BOARD | New | 0 | 2.0M | +2.0M |
| JPMORGAN CHASE & CO | New | 0 | 1.8M | +1.8M |
| Foresite Capital Management VI LLC | New | 0 | 1.8M | +1.8M |
| PRICE T ROWE ASSOCIATES INC /MD/ | New | 0 | 1.3M | +1.3M |
| FMR LLC | New | 0 | 1.2M | +1.2M |
| Bellevue Group AG | New | 0 | 1.1M | +1.1M |
| Siren, L.L.C. | New | 0 | 1.1M | +1.1M |
| JENNISON ASSOCIATES LLC | New | 0 | 1.1M | +1.1M |
| RA CAPITAL MANAGEMENT, L.P. | New | 0 | 700.0K | +700.0K |
| VANGUARD CAPITAL MANAGEMENT LLC | New | 0 | 599.2K | +599.2K |
| Woodline Partners LP | New | 0 | 586.3K | +586.3K |
| BRAIDWELL LP | New | 0 | 500.0K | +500.0K |
| PERCEPTIVE ADVISORS LLC | New | 0 | 500.0K | +500.0K |
| PRINCIPAL FINANCIAL GROUP INC | New | 0 | 414.7K | +414.7K |
| Aberdeen Group plc | New | 0 | 310.4K | +310.4K |
| UBS Group AG | New | 0 | 279.2K | +279.2K |
| BlackRock, Inc. | New | 0 | 229.9K | +229.9K |
| SEVEN GRAND MANAGERS, LLC | New | 0 | 225.0K | +225.0K |
| CITADEL ADVISORS LLC | New | 0 | 191.1K | +191.1K |
| GEODE CAPITAL MANAGEMENT, LLC | New | 0 | 175.9K | +175.9K |
| Pier Capital, LLC | New | 0 | 170.0K | +170.0K |
| AMERIPRISE FINANCIAL INC | New | 0 | 131.8K | +131.8K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | New | 0 | 97.7K | +97.7K |
| VANGUARD FIDUCIARY TRUST CO | New | 0 | 87.8K | +87.8K |
| Pentwater Capital Management LP | New | 0 | 83.0K | +83.0K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | New | 0 | 82.6K | +82.6K |
| Alyeska Investment Group, L.P. | New | 0 | 75.0K | +75.0K |
| STATE STREET CORP | New | 0 | 66.7K | +66.7K |
| ALPS ADVISORS INC | New | 0 | 54.3K | +54.3K |
| TD Asset Management Inc | New | 0 | 47.9K | +47.9K |
| MILLENNIUM MANAGEMENT LLC | New | 0 | 45.3K | +45.3K |
| GSA CAPITAL PARTNERS LLP | New | 0 | 33.2K | +33.2K |
| DAFNA Capital Management LLC | New | 0 | 32.4K | +32.4K |
| NORTHERN TRUST CORP | New | 0 | 31.8K | +31.8K |
| ADAR1 Capital Management, LLC | New | 0 | 26.0K | +26.0K |
| Burkehill Global Management, LP | New | 0 | 25.0K | +25.0K |
| Ghisallo Capital Management LLC | New | 0 | 25.0K | +25.0K |
| Squarepoint Ops LLC | New | 0 | 24.8K | +24.8K |
| HighTower Advisors, LLC | New | 0 | 16.7K | +16.7K |
| MORGAN STANLEY | New | 0 | 11.7K | +11.7K |
| XTX Topco Ltd | New | 0 | 11.0K | +11.0K |
| Zimmer Partners, LP | New | 0 | 10.0K | +10.0K |
| Weiss Asset Management LP | New | 0 | 10.0K | +10.0K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New | 0 | 9.1K | +9.1K |
| Vanguard Global Advisers, LLC | New | 0 | 7.2K | +7.2K |
| CITIGROUP INC | New | 0 | 2.5K | +2.5K |
| JONES FINANCIAL COMPANIES LLLP | New | 0 | 2.3K | +2.3K |
| ASSETMARK, INC | New | 0 | 1.4K | +1.4K |
| BARCLAYS PLC | New | 0 | 837 | +837 |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.