Phathom Pharmaceuticals, Inc.
PHAT- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001783183
No open-market purchases or sales by Phathom Pharmaceuticals, Inc. insiders were filed in the last 90 days; 161 institutions reported holding it in 13F filings for Q2 2026, worth $782.1M in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Phathom Pharmaceuticals, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 174
- +2 vs. Q4 2025
- Shares held
- 68.9M
- +10.1M (+17.2%) vs. Q4 2025
- Total value
- $765.5M
- −$207.3M (−21.3%) vs. Q4 2025
- New holders
- 37
- 75 more added
- Sold out
- 35
- 40 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting PHAT on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 161 | $782.1M |
| Q1 2026 | 174 | $765.5M |
| Q4 2025 | 173 | $1.03B |
| Q3 2025 | 133 | $733.6M |
| Q2 2025 | 117 | $550.5M |
| Q1 2025 | 137 | $401.4M |
| Q4 2024 | 144 | $541.2M |
| Q3 2024 | 133 | $1.31B |
| Q2 2024 | 114 | $598.6M |
| Q1 2024 | 114 | $588.2M |
| Q4 2023 | 117 | $503.3M |
| Q3 2023 | 110 | $452.7M |
| Q2 2023 | 103 | $612.6M |
| Q1 2023 | 84 | $219.7M |
| Q4 2022 | 87 | $316.6M |
| Q3 2022 | 94 | $334.3M |
| Q2 2022 | 94 | $230.0M |
| Q1 2022 | 82 | $349.1M |
| Q4 2021 | 83 | $562.0M |
| Q3 2021 | 84 | $819.8M |
| Q2 2021 | 79 | $843.6M |
| Q1 2021 | 84 | $919.2M |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Phathom Pharmaceuticals, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Frazier Life Sciences Management, L.P. | 12,466,489 | $138.5M | 3.56% | 00.0% | Unchanged |
| Medicxi Ventures Management (Jersey) Ltd | 7,464,572 | $82.9M | 8.45% | 00.0% | Unchanged |
| Invesco Ltd. | 4,322,060 | $48.0M | 0.00% | +401,614+10.2% | Added |
| BlackRock, Inc. | 4,061,996 | $45.1M | 0.00% | +506,448+14.2% | Added |
| Millennium Management LLC | 4,022,909 | $44.7M | 0.03% | +1,940,729+93.2% | Added |
| Carlyle Group Inc. | 3,496,808 | $38.8M | 0.37% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 2,583,636 | $28.7M | 0.00% | +2,583,636 | New |
| NEA Management Company, LLC | 1,960,169 | $21.8M | 1.24% | 00.0% | Unchanged |
| 683 Capital Management, LLC | 1,850,000 | $20.6M | 1.91% | +65,000+3.6% | Added |
| Ensign Peak Advisors, Inc | 1,627,806 | $18.1M | 0.03% | −724,214−30.8% | Reduced |
| Catalys Pacific, LLC | 1,493,854 | $16.6M | 7.19% | +64,840+4.5% | Added |
| GW&K Investment Management, LLC | 1,421,109 | $15.8M | 0.14% | +114,431+8.8% | Added |
| State Street Corp | 1,386,890 | $15.4M | 0.00% | +237,354+20.6% | Added |
| Wasatch Advisors Inc | 1,340,916 | $14.9M | 0.10% | +9,247+0.7% | Added |
| Geode Capital Management, LLC | 1,328,045 | $14.8M | 0.00% | +254,611+23.7% | Added |
| Nomura Asset Management International Inc. | 1,205,369 | $13.4M | 0.02% | +1,205,369 | New |
| SummitTX Capital, L.P. | 995,885 | $11.1M | 0.35% | +478,065+92.3% | Added |
| Franklin Resources Inc | 994,504 | $11.0M | 0.00% | +994,504 | New |
| Perceptive Advisors LLC | 925,000 | $10.3M | 0.20% | +925,000 | New |
| Marshall Wace, LLP | 860,692 | $9.56M | 0.01% | +860,692 | New |
| Propel Bio Management, LLC | 841,272 | $9.35M | 5.90% | +100,354+13.5% | Added |
| Vanguard Portfolio Management LLC | 666,029 | $7.40M | 0.00% | +666,029 | New |
| Goldman Sachs Group Inc | 626,196 | $6.96M | 0.00% | +234,151+59.7% | Added |
| EcoR1 Capital, LLC | 625,000 | $6.94M | 0.30% | +625,000 | New |
| Two Sigma Investments, LP | 482,136 | $5.36M | 0.00% | +424,353+734.4% | Added |
| StepStone Group LP | 422,085 | $4.69M | 2.26% | 00.0% | Unchanged |
| Northern Trust Corp | 414,956 | $4.61M | 0.00% | +58,490+16.4% | Added |
| Charles Schwab Investment Management Inc | 409,015 | $4.54M | 0.00% | +11,105+2.8% | Added |
| Citadel Advisors LLC | 383,058 | $4.26M | 0.00% | +71,743+23.0% | Added |
| Woodline Partners LP | 369,052 | $4.10M | 0.02% | +181,761+97.0% | Added |
| UBS Group AG | 360,371 | $4.00M | 0.00% | +55,988+18.4% | Added |
| Vanguard Fiduciary Trust Co | 338,713 | $3.76M | 0.00% | +338,713 | New |
| Renaissance Technologies LLC | 305,800 | $3.40M | 0.01% | +305,800 | New |
| Trexquant Investment LP | 293,305 | $3.26M | 0.02% | +156,481+114.4% | Added |
| Squarepoint Ops LLC | 275,161 | $3.06M | 0.01% | +275,161 | New |
| JPMorgan Chase & Co | 287,430 | $3.03M | 0.00% | −9,254−3.1% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 267,962 | $2.98M | 0.04% | 00.0% | Unchanged |
| Simplify Asset Management Inc. | 262,386 | $2.92M | 0.04% | −59,549−18.5% | Reduced |
| Ameriprise Financial Inc | 254,219 | $2.82M | 0.00% | +68,475+36.9% | Added |
| Avidity Partners Management LP | 249,390 | $2.77M | 0.56% | +43,314+21.0% | Added |
| Catalio Capital Management, LP | 247,767 | $2.75M | 0.58% | −451,229−64.6% | Reduced |
| Bank of America Corp | 208,115 | $2.31M | 0.00% | −50,881−19.6% | Reduced |
| Birchview Capital, LP | 195,000 | $2.17M | 1.23% | 00.0% | Unchanged |
| GWM Advisors LLC | 183,000 | $2.03M | 0.01% | −17,823−8.9% | Reduced |
| XTX Topco Ltd | 160,501 | $1.78M | 0.03% | +121,101+307.4% | Added |
| Hennion & Walsh Asset Management, Inc. | 145,932 | $1.62M | 0.05% | +30,951+26.9% | Added |
| Gilder Gagnon Howe & Co LLC | 139,889 | $1.55M | 0.02% | −5,285−3.6% | Reduced |
| D. E. Shaw & Co., Inc. | 132,457 | $1.47M | 0.00% | −128,611−49.3% | Reduced |
| Bank of New York Mellon Corp | 124,018 | $1.38M | 0.00% | +1,051+0.9% | Added |
| Nuveen, LLC | 117,301 | $1.30M | 0.00% | +8,455+7.8% | Added |
| Wellington Management Group LLP | 111,752 | $1.24M | 0.00% | −22,794−16.9% | Reduced |
| Stratos Wealth Partners, LTD. | 100,000 | $1.11M | 0.01% | +49,700+98.8% | Added |
| Gsa Capital Partners LLP | 97,068 | $1.08M | 0.07% | +14,444+17.5% | Added |
| Balyasny Asset Management LLC | 95,301 | $1.06M | 0.00% | −111,784−54.0% | Reduced |
| Brevan Howard Capital Management LP | 94,638 | $1.05M | 0.01% | −182,351−65.8% | Reduced |
| Susquehanna International Group, LLP | 92,979 | $1.03M | 0.00% | −456,192−83.1% | Reduced |
| Swiss National Bank | 92,600 | $1.03M | 0.00% | +8,600+10.2% | Added |
| Russell Investments Group, Ltd. | 85,683 | $951.9K | 0.00% | +79,039+1,189.6% | Added |
| Freestone Grove Partners LP | 84,573 | $939.6K | 0.01% | +84,573 | New |
| Hussman Strategic Advisors, Inc. | 84,000 | $933.2K | 0.20% | −63,000−42.9% | Reduced |
| KBC Group NV | 77,139 | $857.0K | 0.00% | +77,139 | New |
| Morgan Stanley | 76,681 | $851.9K | 0.00% | −41,100−34.9% | Reduced |
| Burkehill Global Management, LP | 75,000 | $833.3K | 0.04% | +75,000 | New |
| Engineers Gate Manager LP | 73,848 | $820.5K | 0.01% | +29,590+66.9% | Added |
| Alliancebernstein L.P. | 49,390 | $819.4K | 0.00% | 00.0% | Unchanged |
| Creative Planning | 70,193 | $779.8K | 0.00% | −10,573−13.1% | Reduced |
| Penn Mutual Asset Management, LLC | 62,802 | $697.7K | 3.57% | 00.0% | Unchanged |
| Campbell & CO Investment Adviser LLC | 62,023 | $689.1K | 0.04% | −53,261−46.2% | Reduced |
| Virtus Investment Advisers, Inc. | 57,986 | $644.2K | 0.18% | +11,049+23.5% | Added |
| UBS Asset Management Americas Inc | 55,788 | $619.8K | 0.00% | +25,157+82.1% | Added |
| AQR Capital Management LLC | 55,468 | $616.2K | 0.00% | +1,020+1.9% | Added |
| Rhumbline Advisers | 55,439 | $615.9K | 0.00% | +3,346+6.4% | Added |
| Diadema Partners LP | 54,650 | $607.2K | 0.25% | +54,650 | New |
| Stifel Financial Corp | 54,039 | $600.4K | 0.00% | +2,378+4.6% | Added |
| Price T Rowe Associates Inc | 52,453 | $583.0K | 0.00% | +15,382+41.5% | Added |
| Stonepine Capital Management, LLC | 50,010 | $555.6K | 0.49% | +50,010 | New |
| Wells Fargo & Company | 46,113 | $512.3K | 0.00% | −21,903−32.2% | Reduced |
| State of Wisconsin Investment Board | 44,004 | $488.9K | 0.00% | +28,719+187.9% | Added |
| ADAR1 Capital Management, LLC | 42,900 | $476.6K | 0.03% | 00.0% | Unchanged |
| Aquatic Capital Management LLC | 40,852 | $453.9K | 0.01% | +40,852 | New |
| California State Teachers Retirement System | 40,222 | $446.9K | 0.00% | +79+0.2% | Added |
| Algert Global LLC | 39,420 | $438.0K | 0.01% | +39,420 | New |
| VARCOV Co. | 39,173 | $435.2K | 0.16% | −47,586−54.8% | Reduced |
| Tudor Investment Corp Et Al | 38,225 | $424.7K | 0.00% | +9,671+33.9% | Added |
| Deutsche Bank AG | 36,459 | $405.1K | 0.00% | +3,079+9.2% | Added |
| Tocqueville Asset Management L.P. | 35,200 | $391.1K | 0.01% | +500+1.4% | Added |
| Allstate Corp | 32,687 | $363.2K | 0.00% | +32,687 | New |
| Commonwealth Equity Services, LLC | 32,230 | $358.1K | 0.00% | +1,290+4.2% | Added |
| Legal & General Group Plc | 32,037 | $355.9K | 0.00% | −2,212−6.5% | Reduced |
| Man Group plc | 30,352 | $337.2K | 0.00% | +30,352 | New |
| Citigroup Inc | 29,369 | $326.3K | 0.00% | +910+3.2% | Added |
| Vanguard Asset Management, Ltd | 28,506 | $316.7K | 0.00% | +28,506 | New |
| Kera Capital Partners, Inc. | 26,826 | $298.0K | 0.04% | +2,571+10.6% | Added |
| Persistent Asset Partners Ltd | 26,766 | $297.4K | 0.12% | +13,850+107.2% | Added |
| Vanguard Global Advisers, LLC | 26,511 | $294.5K | 0.00% | +26,511 | New |
| Jump Financial, LLC | 26,445 | $293.8K | 0.00% | +9,037+51.9% | Added |
| Raymond James Financial Inc | 26,328 | $292.5K | 0.00% | +1,938+7.9% | Added |
| MetLife Investment Management | 25,845 | $287.1K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 25,357 | $281.7K | 0.00% | −59,502−70.1% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 24,992 | $277.7K | 0.00% | +5,102+25.7% | Added |