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.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Manufacturers Life Insurance Company, The | Buy | +723 | +5.6% | 13,631 | $147.90K | Q2 2026 | Sep 09, 2026 |
| Citadel Advisors Llc | Sell | -198,157 | -51.7% | 184,901 | $2.01M | Q2 2026 | Sep 02, 2026 |
| California State Teachers Retirement System | Buy | +11,565 | +28.8% | 51,787 | $561.89K | Q2 2026 | Aug 24, 2026 |
| Fulcrum Asset Management Llp | Buy | +4,458 | — | 4,458 | $48.46K | Q2 2026 | Aug 18, 2026 |
| Stonepine Capital Management, Llc | Buy | +35,000 | +70.0% | 85,010 | $922.36K | Q2 2026 | Aug 17, 2026 |
| Invesco Ltd. | Buy | +4,029,731 | — | 4,029,731 | $43.72M | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Buy | +1,151,836 | +183.9% | 1,778,032 | $19.29M | Q2 2026 | Aug 14, 2026 |
| Point72 Asset Management, L.P. | Buy | +1,022,193 | — | 1,022,193 | $11.09M | Q2 2026 | Aug 14, 2026 |
| Hsbc Holdings Plc | Buy | +709,695 | — | 709,695 | $7.70M | Q2 2026 | Aug 14, 2026 |
| Millennium Management Llc | Sell | -647,075 | -16.1% | 3,375,834 | $36.63M | Q2 2026 | Aug 14, 2026 |
| Ensign Peak Advisors, Inc | Sell | -575,893 | -35.4% | 1,051,913 | $11.41M | Q2 2026 | Aug 14, 2026 |
| Perceptive Advisors Llc | Sell | -393,000 | -42.5% | 532,000 | $5.77M | Q2 2026 | Aug 14, 2026 |
| Ameriprise Financial Inc | Buy | +293,979 | — | 293,979 | $3.19M | Q2 2026 | Aug 14, 2026 |
| Nomura Asset Management International Inc. | Buy | +257,369 | +21.4% | 1,462,738 | $15.87M | Q2 2026 | Aug 14, 2026 |
| Squarepoint Ops Llc | Sell | -243,566 | -88.5% | 31,595 | $342.81K | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Buy | +212,706 | — | 212,706 | $2.31M | Q2 2026 | Aug 14, 2026 |
| Summittx Capital, L.P. | Sell | -206,335 | -20.7% | 789,550 | $8.57M | Q2 2026 | Aug 14, 2026 |
| Opaleye Management Inc. | Buy | +185,589 | — | 185,589 | $2.01M | Q2 2026 | Aug 14, 2026 |
| Birchview Capital, Lp | Sell | -140,000 | -71.8% | 55,000 | $596.75K | Q2 2026 | Aug 14, 2026 |
| Trexquant Investment Lp | Sell | -119,421 | -40.7% | 173,884 | $1.89M | Q2 2026 | Aug 14, 2026 |
| Wells Fargo & Company/Mn | Buy | +105,889 | +229.6% | 152,002 | $1.65M | Q2 2026 | Aug 14, 2026 |
| Brevan Howard Capital Management Lp | Sell | -80,039 | -84.6% | 14,599 | $158.40K | Q2 2026 | Aug 14, 2026 |
| Aqr Capital Management Llc | Buy | +79,433 | +143.2% | 134,901 | $1.46M | Q2 2026 | Aug 14, 2026 |
| Diadema Partners Lp | Buy | +75,300 | +137.8% | 129,950 | $1.41M | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Sell | -75,254 | -80.9% | 17,725 | $192.32K | Q2 2026 | Aug 14, 2026 |
| Bank Of America Corp | Sell | -57,100 | -27.4% | 151,015 | $1.64M | Q2 2026 | Aug 14, 2026 |
| Gilder Gagnon Howe & Co Llc | Sell | -51,755 | -37.0% | 88,134 | $956.25K | Q2 2026 | Aug 14, 2026 |
| Avidity Partners Management Lp | Sell | -49,390 | -19.8% | 200,000 | $2.17M | Q2 2026 | Aug 14, 2026 |
| Engineers Gate Manager Lp | Buy | +44,409 | +60.1% | 118,257 | $1.28M | Q2 2026 | Aug 14, 2026 |
| Nomura Holdings Inc | Buy | +40,000 | — | 40,000 | $434.00K | Q2 2026 | Aug 14, 2026 |
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.
Related PHAT Institutional Insights
- PHAT Overview
- PHAT 13F Institutional Holders
- PHAT Top Institutional Shareholders
- Healthcare Sector Institutional Ownership
- Healthcare Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
- Most Bought Healthcare Stocks By Institutional Investors
- Most Sold Healthcare Stocks By Institutional Investors
- PHAT Insider Trading & SEC Form 4 Activity
- PHAT Articles
- Top Institutional Investor Stock Rankings