SPTX · Seaport Therapeutics, Inc. · Shareholders & Ownership
The latest filing states the doubt was alleviated.
“the Company has evaluated whether there are conditions and events that raise substantial doubt about the Company's ability to continue as a going concern within one year after the date the condensed consolidated financial statements are issued. The accompanying condensed consolidated financial statements have been prepared on a going-concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. The Company believes that its existing cash, cash equivalents and investments of $212.6 million as of March 31, 2026, together with the additional proceeds received from the IPO, will be sufficient to allow the Company to fund operations at least twelve months from the date that of these condensed consolidated financial statements are issued.”View the 10-Q filed Jun 8, 2026
Every disclosed holder of SPTX in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns SPTX
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 37,476,575 | 70.01% |
| Insiders (Forms 3, 4, 5) | 0 | 0.00% |
| 13D/G-only blocks | 31,722,179 | 59.26% |
| Remaining | 15,668,204 | -29.27% |
| Registered funds (N-PORT, not summed) | 3,914,865 | 7.31% |
Shares outstanding: 53,530,550, the issuer's latest cover-page count restated onto today's split basis.
Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of SPTX
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
|
16,685,013 | ||
| 2 |
|
16,685,013 | ||
| 3 |
ARCH Venture Fund XII, L.P.
13D
CIK 1906837 · Unknown · May 4, 2026
Item 4 purpose: Passive investment
|
6,294,951 | ||
| 4 |
ARCH Venture Management, LLC
13F
CIK 1274403 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,294,951 | ||
| 5 |
|
6,294,951 | ||
| 6 |
GAP Coinvestments CDA, L.P.
Insider
CIK 1356474 · May 4, 2026
Director, 10% Owner, issuer-wide, not summed
|
6,101,582 | ||
| 7 |
General Atlantic (SP), L.P.
Insider
CIK 2133363 · May 4, 2026
Director, 10% Owner, issuer-wide, not summed
|
6,101,582 | ||
| 8 |
GENERAL ATLANTIC, L.P.
13F
CIK 1017645 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,101,582 | ||
| 9 |
|
5,225,497 | ||
| 9.1 |
Zohar Daphne
Insider
CIK 1727388 · Apr 30, 2026
Director, Chief Executive Officer, issuer-wide, not summed
|
1,194,001 | ||
| 10 |
Sofinnova Investments, Inc.
13F
CIK 1631134 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,564,871 | ||
| 11 |
|
3,516,718 | ||
| 11.1 |
|
863,031 | ||
| 12 |
|
2,731,538 | ||
| 13 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,178,642 | ||
| 14 |
TRV GP VI, LLC
13F
CIK 1990716 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,061,222 | ||
| 15 |
CANADA PENSION PLAN INVESTMENT BOARD
13F
CIK 1283718 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,975,791 | ||
| 16 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,815,845 | ||
| 17 |
Foresite Capital Management VI LLC
13F
CIK 2013341 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,779,521 | ||
| 18 |
PRICE T ROWE ASSOCIATES INC /MD/
13F
CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,308,604 | ||
| 18.1 |
T. Rowe Price Health Sciences Fund, Inc.
Fund
S000002088 · Registered fund · Jun 30, 2026
T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed
|
299,319 | ||
| 18.2 |
T. Rowe Price Health Sciences Portfolio
Fund
S000002083 · Registered fund · Jun 30, 2026
T. ROWE PRICE EQUITY SERIES, INC., not summed
|
18,421 | ||
| 18.3 |
T. Rowe Price Extended Equity Market Index Fund
Fund
S000002090 · Registered fund · Jun 30, 2026
T. ROWE PRICE INDEX TRUST, INC., not summed
|
6,378 | ||
| 19 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,185,100 | ||
| 19.1 |
Fidelity Blue Chip Growth Fund
Fund
S000007195 · Registered fund · Jul 31, 2026
Fidelity Securities Fund, not summed
|
235,900 | ||
| 19.2 |
Fidelity Growth Company Fund
Fund
S000007119 · Registered fund · May 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
224,400 | ||
| 19.3 |
Fidelity Growth Company K6 Fund
Fund
S000065696 · Registered fund · May 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
62,296 | ||
| 19.4 |
Fidelity Series Growth Company Fund
Fund
S000042626 · Registered fund · May 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
55,900 | ||
| 19.5 |
Fidelity Blue Chip Growth K6 Fund
Fund
S000057284 · Registered fund · Jul 31, 2026
Fidelity Securities Fund, not summed
|
48,109 | ||
| 20 |
Bellevue Group AG
13F
CIK 1674546 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,100,000 | ||
| 21 |
Siren, L.L.C.
13F
CIK 2005245 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,095,316 | ||
| 22 |
JENNISON ASSOCIATES LLC
13F
CIK 53417 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,079,669 | ||
| 23 |
JPMorgan Small Cap Growth Fund
Fund
S000003859 · Registered fund · Jun 30, 2026
JPMorgan Trust II, not summed
|
840,931 | ||
| 24 |
RA CAPITAL MANAGEMENT, L.P.
13F
CIK 1346824 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
700,000 | ||
| 25 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
599,217 | ||
| 26 |
Woodline Partners LP
13F
CIK 1784547 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
586,345 | ||
| 27 |
BRAIDWELL LP
13F
CIK 1920938 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
500,000 | ||
| 28 |
PERCEPTIVE ADVISORS LLC
13F
CIK 1224962 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
500,000 | ||
| 29 |
PGIM Jennison Health Sciences Fund
Fund
S000004380 · Registered fund · May 29, 2026
Prudential Sector Funds, Inc., not summed
|
438,754 | ||
| 30 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
426,371 | ||
| 31 |
PRINCIPAL FINANCIAL GROUP INC
13F
CIK 1126328 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
414,672 | ||
| 31.1 |
SmallCap Fund
Fund
S000007214 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
|
181,500 | ||
| 31.2 |
SmallCap Account
Fund
S000007675 · Registered fund · Jun 30, 2026
Principal Variable Contract Funds, Inc, not summed
|
16,200 | ||
| 32 |
Aberdeen Group plc
13F
CIK 1716774 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
310,355 | ||
| 33 |
|
279,184 | ||
| 34 |
JPMorgan Small Cap Blend Fund
Fund
S000002767 · Registered fund · Jun 30, 2026
JPMorgan Trust I, not summed
|
271,499 | ||
| 35 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
229,863 | ||
| 36 |
SEVEN GRAND MANAGERS, LLC
13F
CIK 1909126 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
225,000 | ||
| 37 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
191,144 | ||
| 38 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
175,866 | ||
| 39 |
Pier Capital, LLC
13F
CIK 1310051 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
169,985 | ||
| 40 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
165,436 | ||
| 41 |
AMERIPRISE FINANCIAL INC
13F
CIK 820027 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
131,788 | ||
| 42 |
Multi-Manager Small Cap Equity Strategies Fund
Fund
S000036206 · Registered fund · May 31, 2026
COLUMBIA FUNDS SERIES TRUST I, not summed
|
107,880 | ||
| 43 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
97,693 | ||
| 43.1 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
18,093 | ||
| 44 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
87,772 | ||
| 45 |
Pentwater Capital Management LP
13F
CIK 1425851 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
83,000 | ||
| 46 |
MANUFACTURERS LIFE INSURANCE COMPANY, THE
13F
CIK 928047 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
82,565 | ||
| 47 |
Alyeska Investment Group, L.P.
13F
CIK 1453072 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
75,000 | ||
| 48 |
|
66,650 | ||
| 49 |
abrdn Life Sciences Investors
Fund
· Registered fund · Jun 30, 2026
abrdn Life Sciences Investors, not summed
|
55,039 | ||
| 49.1 |
abrdn Healthcare Investors
Fund
· Registered fund · Jun 30, 2026
abrdn Healthcare Investors, not summed
|
109,862 | ||
| 49.2 |
abrdn Healthcare Opportunities Fund
Fund
· Registered fund · Jun 30, 2026
abrdn Healthcare Opportunities Fund, not summed
|
88,659 | ||
| 49.3 |
abrdn World Healthcare Fund
Fund
· Registered fund · Jun 30, 2026
abrdn World Healthcare Fund, not summed
|
56,795 | ||
| 50 |
ALPS ADVISORS INC
13F
CIK 1376113 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
54,328 |
2 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
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