Seaport Therapeutics, Inc. (SPTX) Institutional Ownership Changes & 13F Activity

Seaport Therapeutics, Inc. (SPTX). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Arch Venture Management, Llc, General Atlantic, L.P., Sofinnova Investments, Inc., Goldman Sachs Group Inc, and Canada Pension Plan Investment Board.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Manufacturers Life Insurance Company, TheBuy+82,56582,565$1.79MQ2 2026Sep 09, 2026
Citadel Advisors LlcBuy+191,144191,144$4.15MQ2 2026Sep 02, 2026
Arch Venture Management, LlcBuy+6,294,9516,294,951$136.60MQ2 2026Aug 14, 2026
General Atlantic, L.P.Buy+6,101,5826,101,582$132.53MQ2 2026Aug 14, 2026
Sofinnova Investments, Inc.Buy+3,564,8713,564,871$77.43MQ2 2026Aug 14, 2026
Goldman Sachs Group IncBuy+2,178,6422,178,642$47.32MQ2 2026Aug 14, 2026
Canada Pension Plan Investment BoardBuy+1,975,7911,975,791$42.91MQ2 2026Aug 14, 2026
Foresite Capital Management Vi LlcBuy+1,779,5211,779,521$38.65MQ2 2026Aug 14, 2026
Price T Rowe Associates IncBuy+1,308,6041,308,604$28.42MQ2 2026Aug 14, 2026
Bellevue Group AgBuy+1,100,0001,100,000$23.89MQ2 2026Aug 14, 2026
Ra Capital Management, L.P.Buy+700,000700,000$15.20MQ2 2026Aug 14, 2026
Woodline Partners LpBuy+586,345586,345$12.74MQ2 2026Aug 14, 2026
Braidwell LpBuy+500,000500,000$10.86MQ2 2026Aug 14, 2026
Perceptive Advisors LlcBuy+500,000500,000$10.86MQ2 2026Aug 14, 2026
Seven Grand Managers, LlcBuy+225,000225,000$4.89MQ2 2026Aug 14, 2026
Ameriprise Financial IncBuy+131,788131,788$2.86MQ2 2026Aug 14, 2026
Charles Schwab Investment Management IncBuy+97,69397,693$2.12MQ2 2026Aug 14, 2026
Pentwater Capital Management LpBuy+83,00083,000$1.80MQ2 2026Aug 14, 2026
Alyeska Investment Group, L.P.Buy+75,00075,000$1.63MQ2 2026Aug 14, 2026
Millennium Management LlcBuy+45,33745,337$984.72KQ2 2026Aug 14, 2026
Dafna Capital Management LlcBuy+32,40032,400$703.73KQ2 2026Aug 14, 2026
Adar1 Capital Management, LlcBuy+26,00026,000$564.72KQ2 2026Aug 14, 2026
Burkehill Global Management, LpBuy+25,00025,000$543.00KQ2 2026Aug 14, 2026
Ghisallo Capital Management LlcBuy+25,00025,000$543.00KQ2 2026Aug 14, 2026
Squarepoint Ops LlcBuy+24,75324,753$537.63KQ2 2026Aug 14, 2026
Xtx Topco LtdBuy+10,98310,983$238.55KQ2 2026Aug 14, 2026
Weiss Asset Management LpBuy+10,00010,000$217.20KQ2 2026Aug 14, 2026
Zimmer Partners, LpBuy+10,00010,000$217.20KQ2 2026Aug 14, 2026
Jones Financial Companies LllpBuy+2,2562,256$48.28KQ2 2026Aug 14, 2026
Barclays PlcBuy+837837$18.18KQ2 2026Aug 14, 2026
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Frequently asked questions about SPTX activity

  • Which institutional owners are buying SPTX?

    Institutional owners buying SPTX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in SPTX activity?

    "Buy" means an investor increased their reported position in SPTX compared to the prior reporting period. This reflects growing exposure to Seaport Therapeutics, Inc. (SPTX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in SPTX increasing?

    Institutional interest in SPTX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.