Seaport Therapeutics
SPTX · NASDAQ
$19.28+$1.49 (+8.38%)TodayMarket closed ·
Prev close $17.79
Who owns SPTX
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 79.0% of SPTX’s shares.
- PureTech Health, L.L.C.31.2%
- ARCH Venture Partners11.8%
- General Atlantic LLC11.4%
- Sofinnova Investments, Inc6.7%
- Next 6 largest institutions18.0%
- All other shareholders21.0%
| Holder | Shares | % of shares |
|---|---|---|
| PureTech Health, L.L.C. | 16.69M | 31.17% |
| ARCH Venture Partners | 6.29M | 11.76% |
| General Atlantic LLC | 6.10M | 11.40% |
| Sofinnova Investments, Inc | 3.56M | 6.66% |
| Third Rock Ventures, LLC | 2.06M | 3.85% |
| CPP Investments | 1.98M | 3.69% |
| Foresite Capital Management, LLC | 1.78M | 3.32% |
| JP Morgan Asset Management | 1.34M | 2.51% |
| T. Rowe Price Associates, Inc. | 1.30M | 2.43% |
| Goldman Sachs & Co. LLC | 1.19M | 2.23% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| JPMorgan Small Cap Growth Fund | 840.93K | 1.57% |
| PGIM Jennison Health Sciences Fund | 438.75K | 0.82% |
| Vanguard Total Stock Market Index Fund | 426.37K | 0.80% |
| Fidelity Growth Company Fund | 350.69K | 0.66% |
| Statens Pensjonsfond Utland | 344.23K | 0.64% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders bought $20.04M (2 trades) of SPTX on the open market, with no sales.
| Insider | Type | Shares | Value |
|---|---|---|---|
| HOMBACH ROBERT J. | Buy | 13.00K | $235.77K |
| PureTech Health plc | Other | 3.03M | — |
| PureTech Health plc | Other | 8.42M | — |
| PureTech Health plc | Other | 40.00M | — |
| PureTech Health plc | Other | 965.25K | — |
| PureTech Health plc | Other | 2.68M | — |
| PureTech Health plc | Other | 12.74M | — |
| Gladstein Lana | Other | 105.26K | — |
| Gladstein Lana | Other | 33.52K | — |
| Chen Michael Cunyuan | Other | 10.53K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 3.65M
- Days to cover
- 8.92
- % of shares outstanding
- 6.82%
- Average daily volume
- 408.95K
- Change since last report
- +15.9%
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