Seaport Therapeutics, Inc.
SPTX- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0002042347
No open-market purchases or sales by Seaport Therapeutics, Inc. insiders were filed in the last 90 days; 54 institutions reported holding it in 13F filings for Q2 2026, worth $815.3M in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Seaport Therapeutics, Inc. as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 54
- +54 vs. Q1 2026
- Shares held
- 37.5M
- +37.5M vs. Q1 2026
- Total value
- $815.3M
- +$815.3M vs. Q1 2026
- New holders
- 54
- 0 more added
- Sold out
- 0
- 0 more reduced
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting SPTX on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 54 | $815.3M |
| Q1 2026 | 0 | $0 |
| Q4 2025 | 0 | $0 |
| Q3 2025 | 0 | $0 |
| Q2 2025 | 0 | $0 |
| Q1 2025 | 0 | $0 |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Seaport Therapeutics, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Barclays PLC | 837 | $18.2K | 0.00% | +837 | New |
| Assetmark, Inc | 1,431 | $31.1K | 0.00% | +1,431 | New |
| Jones Financial Companies LLLP | 2,256 | $48.3K | 0.00% | +2,256 | New |
| Citigroup Inc | 2,454 | $53.3K | 0.00% | +2,454 | New |
| Vanguard Global Advisers, LLC | 7,159 | $155.5K | 0.00% | +7,159 | New |
| Vanguard Portfolio Management LLC | 9,081 | $197.2K | 0.00% | +9,081 | New |
| Weiss Asset Management LP | 10,000 | $217.2K | 0.00% | +10,000 | New |
| Zimmer Partners, LP | 10,000 | $217.2K | 0.01% | +10,000 | New |
| XTX Topco Ltd | 10,983 | $238.6K | 0.00% | +10,983 | New |
| Morgan Stanley | 11,692 | $254.0K | 0.00% | +11,692 | New |
| HighTower Advisors, LLC | 16,666 | $362.0K | 0.00% | +16,666 | New |
| Squarepoint Ops LLC | 24,753 | $537.6K | 0.00% | +24,753 | New |
| Ghisallo Capital Management LLC | 25,000 | $543.0K | 0.01% | +25,000 | New |
| Burkehill Global Management, LP | 25,000 | $543.0K | 0.02% | +25,000 | New |
| ADAR1 Capital Management, LLC | 26,000 | $564.7K | 0.03% | +26,000 | New |
| Northern Trust Corp | 31,802 | $690.7K | 0.00% | +31,802 | New |
| DAFNA Capital Management LLC | 32,400 | $703.7K | 0.13% | +32,400 | New |
| Gsa Capital Partners LLP | 33,178 | $721.0K | 0.05% | +33,178 | New |
| Millennium Management LLC | 45,337 | $984.7K | 0.00% | +45,337 | New |
| TD Asset Management Inc | 47,944 | $1.04M | 0.00% | +47,944 | New |
| Alps Advisors Inc | 54,328 | $1.18M | 0.01% | +54,328 | New |
| State Street Corp | 66,650 | $1.45M | 0.00% | +66,650 | New |
| Alyeska Investment Group, L.P. | 75,000 | $1.63M | 0.00% | +75,000 | New |
| Manufacturers Life Insurance Company, The | 82,565 | $1.79M | 0.00% | +82,565 | New |
| Pentwater Capital Management LP | 83,000 | $1.80M | 0.01% | +83,000 | New |
| Vanguard Fiduciary Trust Co | 87,772 | $1.91M | 0.00% | +87,772 | New |
| Charles Schwab Investment Management Inc | 97,693 | $2.12M | 0.00% | +97,693 | New |
| Ameriprise Financial Inc | 131,788 | $2.86M | 0.00% | +131,788 | New |
| Pier Capital, LLC | 169,985 | $3.69M | 0.49% | +169,985 | New |
| Geode Capital Management, LLC | 175,866 | $3.82M | 0.00% | +175,866 | New |
| Citadel Advisors LLC | 191,144 | $4.15M | 0.00% | +191,144 | New |
| Seven Grand Managers, LLC | 225,000 | $4.89M | 0.20% | +225,000 | New |
| BlackRock, Inc. | 229,863 | $4.99M | 0.00% | +229,863 | New |
| UBS Group AG | 279,184 | $6.06M | 0.00% | +279,184 | New |
| Standard Life Aberdeen plc | 310,355 | $6.74M | 0.01% | +310,355 | New |
| Principal Financial Group Inc | 414,672 | $9.01M | 0.00% | +414,672 | New |
| Perceptive Advisors LLC | 500,000 | $10.9M | 0.17% | +500,000 | New |
| Braidwell LP | 500,000 | $10.9M | 0.40% | +500,000 | New |
| Woodline Partners LP | 586,345 | $12.7M | 0.04% | +586,345 | New |
| Vanguard Capital Management LLC | 599,217 | $13.0M | 0.00% | +599,217 | New |
| Ra Capital Management, L.P. | 700,000 | $15.2M | 0.13% | +700,000 | New |
| Jennison Associates LLC | 1,079,669 | $23.5M | 0.01% | +1,079,669 | New |
| Siren, L.L.C. | 1,095,316 | $23.8M | 0.48% | +1,095,316 | New |
| Bellevue Group AG | 1,100,000 | $23.9M | 0.50% | +1,100,000 | New |
| FMR LLC | 1,185,100 | $25.7M | 0.00% | +1,185,100 | New |
| Price T Rowe Associates Inc | 1,308,604 | $28.4M | 0.00% | +1,308,604 | New |
| Foresite Capital Management VI LLC | 1,779,521 | $38.7M | 6.02% | +1,779,521 | New |
| JPMorgan Chase & Co | 1,815,845 | $40.9M | 0.00% | +1,815,845 | New |
| Canada Pension Plan Investment Board | 1,975,791 | $42.9M | 0.02% | +1,975,791 | New |
| TRV GP VI, LLC | 2,061,222 | $44.8M | 19.27% | +2,061,222 | New |
| Goldman Sachs Group Inc | 2,178,642 | $47.3M | 0.00% | +2,178,642 | New |
| Sofinnova Investments, Inc. | 3,564,871 | $77.4M | 4.14% | +3,564,871 | New |
| General Atlantic LLC | 6,101,582 | $132.5M | 4.56% | +6,101,582 | New |
| ARCH Venture Management, LLC | 6,294,951 | $136.6M | 12.42% | +6,294,951 | New |