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 (Q4 2025). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Millennium Management Llc, Nea Management Company, Llc, 683 Capital Management, Llc, Catalio Capital Management, Lp, and Divisadero Street Capital Management, Lp.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Catalio Capital Management, LpBuy+698,996—698,996$11.60MQ4 2025Sep 02, 2026
Ensign Peak Advisors, IncSell-151,324-6.0%2,352,020$39.02MQ4 2025Aug 18, 2026
Kera Capital Partners, Inc.Buy+24,255—24,255$331.57KQ4 2025Feb 23, 2026
Virtu Financial LlcBuy+15,540—15,540$258.00KQ4 2025Feb 23, 2026
Newedge Advisors, LlcBuy+200,823—200,823$3.16MQ4 2025Feb 18, 2026
Raymond James Financial IncBuy+24,390—24,390$404.63KQ4 2025Feb 18, 2026
Millennium Management LlcBuy+2,082,180—2,082,180$34.54MQ4 2025Feb 17, 2026
Nea Management Company, LlcBuy+1,960,169—1,960,169$32.52MQ4 2025Feb 17, 2026
683 Capital Management, LlcBuy+1,785,000—1,785,000$29.61MQ4 2025Feb 17, 2026
Divisadero Street Capital Management, LpBuy+662,312—662,312$10.99MQ4 2025Feb 17, 2026
Moore Capital Management, LpBuy+600,000—600,000$9.95MQ4 2025Feb 17, 2026
Susquehanna International Group, LlpBuy+549,171—549,171$9.11MQ4 2025Feb 17, 2026
Summittx Capital, L.P.Buy+517,820—517,820$8.59MQ4 2025Feb 17, 2026
Stepstone Group LpBuy+422,085—422,085$4.97MQ4 2025Feb 17, 2026
Northern Trust CorpBuy+356,466—356,466$5.91MQ4 2025Feb 17, 2026
Citadel Advisors LlcBuy+311,315—311,315$5.16MQ4 2025Feb 17, 2026
Brevan Howard Capital Management LpBuy+276,989—276,989$4.60MQ4 2025Feb 17, 2026
Susquehanna Portfolio Strategies, LlcBuy+267,962—267,962$4.45MQ4 2025Feb 17, 2026
D. E. Shaw & Co., Inc.Buy+261,068—261,068$4.33MQ4 2025Feb 17, 2026
Bank Of America CorpBuy+258,996—258,996$4.30MQ4 2025Feb 17, 2026
Balyasny Asset Management L.P.Buy+207,085—207,085$3.44MQ4 2025Feb 17, 2026
Woodline Partners LpBuy+187,291—187,291$3.11MQ4 2025Feb 17, 2026
Ameriprise Financial IncBuy+185,744—185,744$3.08MQ4 2025Feb 17, 2026
Gilder Gagnon Howe & Co LlcBuy+145,174—145,174$2.41MQ4 2025Feb 17, 2026
Trexquant Investment LpBuy+136,824—136,824$2.27MQ4 2025Feb 17, 2026
Wellington Management Group LlpBuy+134,546—134,546$2.23MQ4 2025Feb 17, 2026
Varcov Co.Buy+86,759—86,759$1.44MQ4 2025Feb 17, 2026
Creative PlanningBuy+80,766—80,766$1.34MQ4 2025Feb 17, 2026
Dark Forest Capital Management LpBuy+62,248—62,248$1.03MQ4 2025Feb 17, 2026
Two Sigma Investments, LpBuy+57,783—57,783$958.62KQ4 2025Feb 17, 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.