PHATHOM PHARMACEUTICALS INC (PHAT) Institutional Ownership Changes & 13F Activity

PHATHOM PHARMACEUTICALS INC (PHAT). 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 Invesco Ltd., Goldman Sachs Group Inc, Point72 Asset Management, L.P., Hsbc Holdings Plc, and Millennium Management Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Manufacturers Life Insurance Company, TheBuy+723+5.6%13,631$147.90KQ2 2026Sep 09, 2026
Citadel Advisors LlcSell-198,157-51.7%184,901$2.01MQ2 2026Sep 02, 2026
California State Teachers Retirement SystemBuy+11,565+28.8%51,787$561.89KQ2 2026Aug 24, 2026
Fulcrum Asset Management LlpBuy+4,4584,458$48.46KQ2 2026Aug 18, 2026
Stonepine Capital Management, LlcBuy+35,000+70.0%85,010$922.36KQ2 2026Aug 17, 2026
Invesco Ltd.Buy+4,029,7314,029,731$43.72MQ2 2026Aug 14, 2026
Goldman Sachs Group IncBuy+1,151,836+183.9%1,778,032$19.29MQ2 2026Aug 14, 2026
Point72 Asset Management, L.P.Buy+1,022,1931,022,193$11.09MQ2 2026Aug 14, 2026
Hsbc Holdings PlcBuy+709,695709,695$7.70MQ2 2026Aug 14, 2026
Millennium Management LlcSell-647,075-16.1%3,375,834$36.63MQ2 2026Aug 14, 2026
Ensign Peak Advisors, IncSell-575,893-35.4%1,051,913$11.41MQ2 2026Aug 14, 2026
Perceptive Advisors LlcSell-393,000-42.5%532,000$5.77MQ2 2026Aug 14, 2026
Ameriprise Financial IncBuy+293,979293,979$3.19MQ2 2026Aug 14, 2026
Nomura Asset Management International Inc.Buy+257,369+21.4%1,462,738$15.87MQ2 2026Aug 14, 2026
Squarepoint Ops LlcSell-243,566-88.5%31,595$342.81KQ2 2026Aug 14, 2026
Jane Street Group, LlcBuy+212,706212,706$2.31MQ2 2026Aug 14, 2026
Summittx Capital, L.P.Sell-206,335-20.7%789,550$8.57MQ2 2026Aug 14, 2026
Opaleye Management Inc.Buy+185,589185,589$2.01MQ2 2026Aug 14, 2026
Birchview Capital, LpSell-140,000-71.8%55,000$596.75KQ2 2026Aug 14, 2026
Trexquant Investment LpSell-119,421-40.7%173,884$1.89MQ2 2026Aug 14, 2026
Wells Fargo & Company/MnBuy+105,889+229.6%152,002$1.65MQ2 2026Aug 14, 2026
Brevan Howard Capital Management LpSell-80,039-84.6%14,599$158.40KQ2 2026Aug 14, 2026
Aqr Capital Management LlcBuy+79,433+143.2%134,901$1.46MQ2 2026Aug 14, 2026
Diadema Partners LpBuy+75,300+137.8%129,950$1.41MQ2 2026Aug 14, 2026
Susquehanna International Group, LlpSell-75,254-80.9%17,725$192.32KQ2 2026Aug 14, 2026
Bank Of America CorpSell-57,100-27.4%151,015$1.64MQ2 2026Aug 14, 2026
Gilder Gagnon Howe & Co LlcSell-51,755-37.0%88,134$956.25KQ2 2026Aug 14, 2026
Avidity Partners Management LpSell-49,390-19.8%200,000$2.17MQ2 2026Aug 14, 2026
Engineers Gate Manager LpBuy+44,409+60.1%118,257$1.28MQ2 2026Aug 14, 2026
Nomura Holdings IncBuy+40,00040,000$434.00KQ2 2026Aug 14, 2026
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Frequently asked questions about PHAT activity

  • Which institutional owners are buying PHAT?

    Institutional owners buying PHAT 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 PHAT activity?

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

  • Is institutional interest in PHAT increasing?

    Institutional interest in PHAT 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.