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 |
|---|---|---|---|---|---|
| ARCH Venture Management, LLC | 6,294,951 | $136.6M | 12.42% | +6,294,951 | New |
| General Atlantic LLC | 6,101,582 | $132.5M | 4.56% | +6,101,582 | New |
| Sofinnova Investments, Inc. | 3,564,871 | $77.4M | 4.14% | +3,564,871 | New |
| Goldman Sachs Group Inc | 2,178,642 | $47.3M | 0.00% | +2,178,642 | New |
| TRV GP VI, LLC | 2,061,222 | $44.8M | 19.27% | +2,061,222 | New |
| Canada Pension Plan Investment Board | 1,975,791 | $42.9M | 0.02% | +1,975,791 | New |
| JPMorgan Chase & Co | 1,815,845 | $40.9M | 0.00% | +1,815,845 | New |
| Foresite Capital Management VI LLC | 1,779,521 | $38.7M | 6.02% | +1,779,521 | New |
| Price T Rowe Associates Inc | 1,308,604 | $28.4M | 0.00% | +1,308,604 | New |
| FMR LLC | 1,185,100 | $25.7M | 0.00% | +1,185,100 | New |
| Bellevue Group AG | 1,100,000 | $23.9M | 0.50% | +1,100,000 | New |
| Siren, L.L.C. | 1,095,316 | $23.8M | 0.48% | +1,095,316 | New |
| Jennison Associates LLC | 1,079,669 | $23.5M | 0.01% | +1,079,669 | New |
| Ra Capital Management, L.P. | 700,000 | $15.2M | 0.13% | +700,000 | New |
| Vanguard Capital Management LLC | 599,217 | $13.0M | 0.00% | +599,217 | New |
| Woodline Partners LP | 586,345 | $12.7M | 0.04% | +586,345 | New |
| Perceptive Advisors LLC | 500,000 | $10.9M | 0.17% | +500,000 | New |
| Braidwell LP | 500,000 | $10.9M | 0.40% | +500,000 | New |
| Principal Financial Group Inc | 414,672 | $9.01M | 0.00% | +414,672 | New |
| Standard Life Aberdeen plc | 310,355 | $6.74M | 0.01% | +310,355 | New |
| UBS Group AG | 279,184 | $6.06M | 0.00% | +279,184 | New |
| BlackRock, Inc. | 229,863 | $4.99M | 0.00% | +229,863 | New |
| Seven Grand Managers, LLC | 225,000 | $4.89M | 0.20% | +225,000 | New |
| Citadel Advisors LLC | 191,144 | $4.15M | 0.00% | +191,144 | New |
| Geode Capital Management, LLC | 175,866 | $3.82M | 0.00% | +175,866 | New |
| Pier Capital, LLC | 169,985 | $3.69M | 0.49% | +169,985 | New |
| Ameriprise Financial Inc | 131,788 | $2.86M | 0.00% | +131,788 | New |
| Charles Schwab Investment Management Inc | 97,693 | $2.12M | 0.00% | +97,693 | New |
| Vanguard Fiduciary Trust Co | 87,772 | $1.91M | 0.00% | +87,772 | New |
| Pentwater Capital Management LP | 83,000 | $1.80M | 0.01% | +83,000 | New |
| Manufacturers Life Insurance Company, The | 82,565 | $1.79M | 0.00% | +82,565 | New |
| Alyeska Investment Group, L.P. | 75,000 | $1.63M | 0.00% | +75,000 | New |
| State Street Corp | 66,650 | $1.45M | 0.00% | +66,650 | New |
| Alps Advisors Inc | 54,328 | $1.18M | 0.01% | +54,328 | New |
| TD Asset Management Inc | 47,944 | $1.04M | 0.00% | +47,944 | New |
| Millennium Management LLC | 45,337 | $984.7K | 0.00% | +45,337 | New |
| Gsa Capital Partners LLP | 33,178 | $721.0K | 0.05% | +33,178 | New |
| DAFNA Capital Management LLC | 32,400 | $703.7K | 0.13% | +32,400 | New |
| Northern Trust Corp | 31,802 | $690.7K | 0.00% | +31,802 | New |
| ADAR1 Capital Management, LLC | 26,000 | $564.7K | 0.03% | +26,000 | 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 |
| Squarepoint Ops LLC | 24,753 | $537.6K | 0.00% | +24,753 | New |
| HighTower Advisors, LLC | 16,666 | $362.0K | 0.00% | +16,666 | New |
| Morgan Stanley | 11,692 | $254.0K | 0.00% | +11,692 | New |
| XTX Topco Ltd | 10,983 | $238.6K | 0.00% | +10,983 | 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 |
| Vanguard Portfolio Management LLC | 9,081 | $197.2K | 0.00% | +9,081 | New |
| Vanguard Global Advisers, LLC | 7,159 | $155.5K | 0.00% | +7,159 | New |
| Citigroup Inc | 2,454 | $53.3K | 0.00% | +2,454 | New |
| Jones Financial Companies LLLP | 2,256 | $48.3K | 0.00% | +2,256 | New |
| Assetmark, Inc | 1,431 | $31.1K | 0.00% | +1,431 | New |
| Barclays PLC | 837 | $18.2K | 0.00% | +837 | New |