Seaport Therapeutics SPTX Institutional Ownership

NASDAQ SPTX

$20.83 +0.22 (+1.07%)

At close: Oct 26, 2026 · 4:00 PM EDT

Institutions by Trading Activity

54 Institutions

Increased 54 100.0%

Unchanged 0 0.0%

Reduced 0 0.0%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

69.88%

Shares Held by Institutions

37.41Mn

of 53.53Mn outstanding

■0.00% QoQ

Shares Outstanding

53.53Mn

16.12Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

Net Shares Added (QoQ)

+37.41Mn

accumulated since last quarter

Value of Holdings

$771.00Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 10, 2026

Seaport Therapeutics, Inc. (NASDAQ:SPTX) was reported as a holding by 54 institutional investors in 13F filings for the quarter ended June 30, 2026.

At the end of Q2 2026, these holders held 69.88% of Seaport Therapeutics' outstanding shares.
Combined, institutional investors held 37.41Mn shares of SPTX as of Q2 2026.
ARCH Venture Management, LLC held the largest position in SPTX at 6.29Mn shares as of June 30, 2026, or 11.76% of shares outstanding.
Seaport Therapeutics' 10 largest institutional shareholders as of Q2 2026 were ARCH Venture Management, LLC (6.29Mn shares), General Atlantic, L.P. (6.1Mn shares), Sofinnova Investments, Inc. (3.56Mn shares), Goldman Sachs Group Inc (2.18Mn shares), TRV GP VI, LLC (2.06Mn shares), Canada Pension Plan Investment Board (1.98Mn shares), JPMorgan Chase & Co (1.82Mn shares), Foresite Capital Management VI LLC (1.78Mn shares), T. Rowe Price Associates Inc (1.31Mn shares) and FMR LLC (1.19Mn shares), per Business Quant data.

Form 13F Holdings

54 Institutional Holders

Report period 30 Jun, 2026

Total shares held 37.41Mn

Of outstanding 69.88%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	ARCH Venture Management, LLC	0001274403	6,294,951	11.76%	▲6,294,951	0.00%	$136.60Mn
2	GENERAL ATLANTIC, L.P.	0001017645	6,101,582	11.40%	▲6,101,582	0.00%	$132.53Mn
3	Sofinnova Investments, Inc.	0001631134	3,564,871	6.66%	▲3,564,871	0.00%	$77.43Mn
4	Goldman Sachs Group Inc	0000886982	2,178,642	4.07%	▲2,178,642	0.00%	$47.32Mn
5	TRV GP VI, LLC	0001990716	2,061,222	3.85%	▲2,061,222	0.00%	$44.77Mn
6	CANADA PENSION PLAN INVESTMENT BOARD	0001283718	1,975,791	3.69%	▲1,975,791	0.00%	$42.91Mn
7	Jpmorgan Chase & Co	0000019617	1,815,845	3.39%	▲1,815,845	0.00%	$40.89Mn
8	Foresite Capital Management VI LLC	0002013341	1,779,521	3.32%	▲1,779,521	0.00%	$38.65Mn
9	PRICE T ROWE ASSOCIATES INC /MD/	0000080255	1,308,604	2.44%	▲1,308,604	0.00%	$28.42K
10	FMR LLC	0000315066	1,185,100	2.21%	▲1,185,100	0.00%	$25.74Mn
11	Bellevue Group AG	0001674546	1,100,000	2.05%	▲1,100,000	0.00%	$23.89Mn
12	Siren, L.L.C.	0002005245	1,095,316	2.05%	▲1,095,316	0.00%	$23.79Mn
13	JENNISON ASSOCIATES LLC	0000053417	1,079,669	2.02%	▲1,079,669	0.00%	$23.45Mn
14	RA CAPITAL MANAGEMENT, L.P.	0001346824	700,000	1.31%	▲700,000	0.00%	$15.20Mn
15	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	599,217	1.12%	▲599,217	0.00%	$13.01Mn
16	Woodline Partners LP	0001784547	586,345	1.10%	▲586,345	0.00%	$12.74Mn
17	PERCEPTIVE ADVISORS LLC	0001224962	500,000	0.93%	▲500,000	0.00%	$10.86Mn
17	BRAIDWELL LP	0001920938	500,000	0.93%	▲500,000	0.00%	$10.86Mn
18	Principal Financial Group Inc	0001126328	414,672	0.77%	▲414,672	0.00%	$9.01Mn
19	Aberdeen Group plc	0001716774	310,355	0.58%	▲310,355	0.00%	$6.74Mn

Showing 1 to 20 of 54 holders