Who owns Seaport Therapeutics, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from SEC filings.
Institutional ownership of SPTX from SEC Form 13F filings across 39 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 39 institutions disclosed 12.6M shares of Seaport Therapeutics, Inc. worth $246.4M — about 35.7% of shares outstanding; the largest disclosed holder is GOLDMAN SACHS GROUP INC. Source: SEC Form 13F filings, parsed by EvidInvest.
39
13F holders
$246.4M
value, 2026 filers
35.7%
of shares outstanding (12.6M sh)
39
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of SPTX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | GOLDMAN SACHS GROUP INCNEW | 2.2M | $47.3M | 0.0% | 6.2% | new |
| 2 | JPMORGAN CHASE & CONEW | 1.8M | $40.9M | 0.0% | 5.2% | new |
| 3 | PRICE T ROWE ASSOCIATES INC /MD/NEW | 1.3M | $28,424 | 0.0% | 3.7% | new |
| 4 | FMR LLCNEW | 1.2M | $25.7M | 0.0% | 3.4% | new |
| 5 | Bellevue Group AGNEW | 1.1M | $23.9M | 0.5% | 3.1% | new |
| 6 | JENNISON ASSOCIATES LLCNEW | 1.1M | $23.5M | 0.0% | 3.1% | new |
| 7 | VANGUARD CAPITAL MANAGEMENT LLCNEW | 599,217 | $13.0M | 0.0% | 1.7% | new |
| 8 | Woodline Partners LPNEW | 586,345 | $12.7M | 0.0% | 1.7% | new |
| 9 | PRINCIPAL FINANCIAL GROUP INCNEW | 414,672 | $9.0M | 0.0% | 1.2% | new |
| 10 | Aberdeen Group plcNEW | 310,355 | $6.7M | 0.0% | 0.9% | new |
| 11 | UBS Group AGNEW | 279,184 | $6.1M | 0.0% | 0.8% | new |
| 12 | BlackRock, Inc.NEW | 229,863 | $5.0M | 0.0% | 0.7% | new |
| 13 | SEVEN GRAND MANAGERS, LLCNEW | 225,000 | $4.9M | 0.2% | 0.6% | new |
| 14 | CITADEL ADVISORS LLCNEW | 191,144 | $4.2M | 0.0% | 0.5% | new |
| 15 | GEODE CAPITAL MANAGEMENT, LLCNEW | 175,866 | $3.8M | 0.0% | 0.5% | new |
| 16 | AMERIPRISE FINANCIAL INCNEW | 131,788 | $2.9M | 0.0% | 0.4% | new |
| 17 | Sixth Street Partners Management Company, L.P.NEW | 97,693 | $2.1M | 0.4% | 0.3% | new |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INCNEW | 97,693 | $2.1M | 0.0% | 0.3% | new |
| 19 | VANGUARD FIDUCIARY TRUST CONEW | 87,772 | $1.9M | 0.0% | 0.2% | new |
| 20 | Pentwater Capital Management LPNEW | 83,000 | $1.8M | 0.0% | 0.2% | new |
| 21 | MANUFACTURERS LIFE INSURANCE COMPANY, THENEW | 82,565 | $1.8M | 0.0% | 0.2% | new |
| 22 | ALPS ADVISORS INCNEW | 54,328 | $1.2M | 0.0% | 0.2% | new |
| 23 | TD Asset Management IncNEW | 47,944 | $1.0M | 0.0% | 0.1% | new |
| 24 | MILLENNIUM MANAGEMENT LLCNEW | 45,337 | $984,720 | 0.0% | 0.1% | new |
| 25 | NORTHERN TRUST CORPNEW | 31,802 | $690,739 | 0.0% | 0.1% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.