Phathom PharmaceuticalsPHAT
13F holders, Q1 2026 (March 31)174holders +1
31new positions
34sold out
6famous investors
$11.11avg. 13F price*
At the end of Q1 2026, 174 institutions reported holding Phathom Pharmaceuticals Inc. (PHAT) in their 13F filings, up 1 from Q4 2025. 31 opened new positions and 34 sold out. The largest holders were Frazier Life Sciences Management, L.P. ($138.5M), Medicxi Ventures Management (Jersey) Ltd ($82.9M) and Invesco Ltd. ($48.0M). 6 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Phathom Pharmaceuticals Inc.
- CUSIP
- 71722W107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 31 | $64.4M |
| Exits | 34 | $42.1M |
All 13F filers, Q4 2025 → Q1 2026: 11,774,231 shares bought and 5,295,077 shares sold, net +6,479,154 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 174 holders
| Frazier Life Sciences Management, L.P. | 3.57% | No change | 12,466,489 | $138.5M |
| Medicxi Ventures Management (Jersey) Ltd | 8.45% | No change | 7,464,572 | $82.9M |
| Invesco Ltd. | 0.00% | Add +10.2% | 4,322,060 | $48.0M |
| BlackRock, Inc. | 0.00% | Add +14.2% | 4,061,996 | $45.1M |
| Millennium Management | 0.04% | Add +93.2% | 4,022,909 | $44.7M |
| Carlyle Group Inc. | 0.37% | No change | 3,496,808 | $38.8M |
| Vanguard Capital Management LLC | 0.00% | — | 2,583,636 | $28.7M |
| NEA Management Company, LLC | 1.24% | No change | 1,960,169 | $21.8M |
| 683 Capital Management, LLC | 2.01% | Add +3.6% | 1,850,000 | $20.6M |
| Ensign Peak Advisors, Inc | 0.03% | Reduce -30.8% | 1,627,806 | $18.1M |
| Catalys Pacific, LLC | 7.19% | Add +4.5% | 1,493,854 | $16.6M |
| GW&K Investment Management, LLC | 0.14% | Add +8.8% | 1,421,109 | $15.8M |
| State Street Corp. | 0.00% | Add +20.6% | 1,386,890 | $15.4M |
| Wasatch Advisors LP | 0.10% | Add +0.7% | 1,340,916 | $14.9M |
| Geode Capital Management, LLC | 0.00% | Add +23.7% | 1,328,045 | $14.8M |
| Nomura Asset Management International Inc. | 0.02% | New | 1,205,369 | $13.4M |
| SummitTX Capital, L.P. | 0.35% | Add +92.3% | 995,885 | $11.1M |
| Franklin Resources Inc. | 0.00% | New | 994,504 | $11.0M |
| Perceptive Advisors LLC | 0.20% | New | 925,000 | $10.3M |
| Marshall Wace, LLP | 0.01% | New | 860,692 | $9.6M |
| Propel Bio Management, LLC | 5.90% | Add +13.5% | 841,272 | $9.4M |
| Vanguard Portfolio Management LLC | 0.00% | — | 666,029 | $7.4M |
| Goldman Sachs Group Inc. | 0.00% | Add +59.7% | 626,196 | $7.0M |
| EcoR1 Capital, LLC | 0.30% | New | 625,000 | $6.9M |
| Two Sigma Investments, LP | 0.00% | Add +734.4% | 482,136 | $5.4M |
| StepStone Group LP | 2.26% | No change | 422,085 | $4.7M |
| Northern Trust Corp. | 0.00% | Add +16.4% | 414,956 | $4.6M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +2.8% | 409,015 | $4.5M |
| Citadel Advisors | 0.00% | Add +23.1% | 383,058 | $4.3M |
| Woodline Partners LP | 0.02% | Add +97.0% | 369,052 | $4.1M |
| UBS Group AG | 0.00% | Add +18.4% | 360,371 | $4.0M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 338,713 | $3.8M |
| Renaissance Technologies | 0.01% | New | 305,800 | $3.4M |
| Trexquant Investment LP | 0.02% | Add +114.4% | 293,305 | $3.3M |
| Squarepoint Ops LLC | 0.01% | New | 275,161 | $3.1M |
| JPMorgan Chase & Co. | 0.00% | Reduce -3.1% | 287,430 | $3.0M |
| Susquehanna Portfolio Strategies, LLC | 0.04% | No change | 267,962 | $3.0M |
| Simplify Asset Management Inc. | 0.04% | Reduce -18.5% | 262,386 | $2.9M |
| Ameriprise Financial Inc. | 0.00% | Add +36.9% | 254,219 | $2.8M |
| Avidity Partners Management LP | 0.56% | Add +21.0% | 249,390 | $2.8M |
| Catalio Capital Management, LP | 0.57% | Reduce -64.5% | 247,767 | $2.8M |
| Bank of America Corp. | 0.00% | Reduce -19.6% | 208,115 | $2.3M |
| Birchview Capital, LP | 1.23% | No change | 195,000 | $2.2M |
| NewEdge Advisors, LLC | 0.01% | Reduce -8.9% | 183,000 | $2.0M |
| XTX Topco Ltd | 0.03% | Add +307.4% | 160,501 | $1.8M |
| Hennion & Walsh Asset Management, Inc. | 0.05% | Add +26.9% | 145,932 | $1.6M |
| Gilder Gagnon Howe & Co. LLC | 0.02% | Reduce -3.6% | 139,889 | $1.6M |
| D. E. Shaw & Co. | 0.00% | Reduce -49.3% | 132,457 | $1.5M |
| Bank of New York Mellon Corp | 0.00% | Add +0.8% | 124,018 | $1.4M |
| Nuveen, LLC | 0.00% | Add +7.8% | 117,301 | $1.3M |
| Wellington Management Group LLP | 0.00% | Reduce -16.9% | 111,752 | $1.2M |
| Stratos Wealth Partners, LTD. | 0.01% | Add +98.8% | 100,000 | $1.1M |
| Gsa Capital Partners LLP | 0.07% | Add +17.5% | 97,068 | $1.1M |
| Balyasny Asset Management L.P. | 0.00% | Reduce -54.0% | 95,301 | $1.1M |
| Brevan Howard Capital Management LP | 0.01% | Reduce -65.8% | 94,638 | $1.1M |
| Susquehanna International Group, LLP | 0.00% | Reduce -83.1% | 92,979 | $1.0M |
| Swiss National Bank | 0.00% | Add +10.2% | 92,600 | $1.0M |
| Russell Investments Group, Ltd. | 0.00% | Add +1189.6% | 85,683 | $952K |
| Freestone Grove Partners LP | 0.01% | New | 84,573 | $940K |
| Hussman Strategic Advisors, Inc. | 0.20% | Reduce -42.9% | 84,000 | $933K |
| KBC Group NV | 0.00% | New | 77,139 | $857K |
| Morgan Stanley | 0.00% | Reduce -34.9% | 76,681 | $852K |
| Burkehill Global Management, LP | 0.04% | New | 75,000 | $833K |
| Engineers Gate Manager LP | 0.01% | Add +66.9% | 73,848 | $820K |
| Alliancebernstein L.P. | 0.00% | No change | 49,390 | $819K |
| Creative Planning | 0.00% | Reduce -13.1% | 70,193 | $780K |
| Penn Mutual Asset Management | 5.54% | No change | 62,802 | $698K |
| Campbell & CO Investment Adviser LLC | 0.04% | Reduce -46.2% | 62,023 | $689K |
| Virtus Investment Advisers, LLC | 0.18% | Add +23.5% | 57,986 | $644K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +82.1% | 55,788 | $620K |
| AQR Capital Management | 0.00% | Add +1.9% | 55,468 | $616K |
| Rhumbline Advisers | 0.00% | Add +6.4% | 55,439 | $616K |
| Diadema Partners LP | 0.25% | New | 54,650 | $607K |
| Stifel Financial Corp. | 0.00% | Add +4.6% | 54,039 | $600K |
| T. Rowe Price Associates Inc. | 0.00% | Add +41.5% | 52,453 | $583K |
| Stonepine Capital Management, LLC | 0.49% | New | 50,010 | $556K |
| Wells Fargo & Company | 0.00% | Reduce -32.2% | 46,113 | $512K |
| State of Wisconsin Investment Board | 0.00% | Add +187.9% | 44,004 | $489K |
| ADAR1 Capital Management, LLC | 0.03% | No change | 42,900 | $477K |
| Aquatic Capital Management LLC | 0.01% | New | 40,852 | $454K |
| California State Teachers Retirement System | 0.00% | Add +0.2% | 40,222 | $447K |
| Algert Global LLC | 0.01% | New | 39,420 | $438K |
| VARCOV Co. | 0.16% | Reduce -54.9% | 39,173 | $435K |
| Tudor Investment Corporation | 0.00% | Add +33.9% | 38,225 | $425K |
| Deutsche Bank AG | 0.00% | Add +9.2% | 36,459 | $405K |
| Tocqueville Asset Management L.P. | 0.01% | Add +1.4% | 35,200 | $391K |
| Allstate Corp. | 0.00% | New | 32,687 | $363K |
| Commonwealth Equity Services, LLC | 0.00% | Add +4.2% | 32,230 | $358K |
| Legal & General Group Plc | 0.00% | Reduce -6.5% | 32,037 | $356K |
| Man Group plc | 0.00% | New | 30,352 | $337K |
| Citigroup Inc. | 0.00% | Add +3.2% | 29,369 | $326K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 28,506 | $317K |
| Kera Capital Partners, Inc. | 0.04% | Add +10.6% | 26,826 | $298K |
| Persistent Asset Partners Ltd | 0.12% | Add +107.2% | 26,766 | $297K |
| Vanguard Global Advisers, LLC | 0.00% | — | 26,511 | $295K |
| Jump Financial, LLC | 0.00% | Add +51.9% | 26,445 | $294K |
| Raymond James Financial Inc. | 0.00% | Add +8.0% | 26,328 | $293K |
| MetLife Investment Management, LLC | 0.00% | No change | 25,845 | $287K |
| Barclays PLC | 0.00% | Reduce -70.1% | 25,357 | $282K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 0.00% | Add +25.6% | 24,992 | $278K |
"% of holder's portfolio" is PHAT's weight in each manager's 13F, not the share of Phathom Pharmaceuticals Inc. the manager owns.