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 |
|---|---|---|---|---|---|
| Stifel Financial Corp | 54,039 | $600.4K | 0.00% | +2,378+4.6% | Added |
| Diadema Partners LP | 54,650 | $607.2K | 0.25% | +54,650 | New |
| Rhumbline Advisers | 55,439 | $615.9K | 0.00% | +3,346+6.4% | Added |
| AQR Capital Management LLC | 55,468 | $616.2K | 0.00% | +1,020+1.9% | Added |
| UBS Asset Management Americas Inc | 55,788 | $619.8K | 0.00% | +25,157+82.1% | Added |
| Virtus Investment Advisers, Inc. | 57,986 | $644.2K | 0.18% | +11,049+23.5% | Added |
| Campbell & CO Investment Adviser LLC | 62,023 | $689.1K | 0.04% | −53,261−46.2% | Reduced |
| Penn Mutual Asset Management, LLC | 62,802 | $697.7K | 3.57% | 00.0% | Unchanged |
| Creative Planning | 70,193 | $779.8K | 0.00% | −10,573−13.1% | Reduced |
| Alliancebernstein L.P. | 49,390 | $819.4K | 0.00% | 00.0% | Unchanged |
| Engineers Gate Manager LP | 73,848 | $820.5K | 0.01% | +29,590+66.9% | Added |
| Burkehill Global Management, LP | 75,000 | $833.3K | 0.04% | +75,000 | New |
| Morgan Stanley | 76,681 | $851.9K | 0.00% | −41,100−34.9% | Reduced |
| KBC Group NV | 77,139 | $857.0K | 0.00% | +77,139 | New |
| Hussman Strategic Advisors, Inc. | 84,000 | $933.2K | 0.20% | −63,000−42.9% | Reduced |
| Freestone Grove Partners LP | 84,573 | $939.6K | 0.01% | +84,573 | New |
| Russell Investments Group, Ltd. | 85,683 | $951.9K | 0.00% | +79,039+1,189.6% | Added |
| Swiss National Bank | 92,600 | $1.03M | 0.00% | +8,600+10.2% | Added |
| Susquehanna International Group, LLP | 92,979 | $1.03M | 0.00% | −456,192−83.1% | Reduced |
| Brevan Howard Capital Management LP | 94,638 | $1.05M | 0.01% | −182,351−65.8% | Reduced |
| Balyasny Asset Management LLC | 95,301 | $1.06M | 0.00% | −111,784−54.0% | Reduced |
| Gsa Capital Partners LLP | 97,068 | $1.08M | 0.07% | +14,444+17.5% | Added |
| Stratos Wealth Partners, LTD. | 100,000 | $1.11M | 0.01% | +49,700+98.8% | Added |
| Wellington Management Group LLP | 111,752 | $1.24M | 0.00% | −22,794−16.9% | Reduced |
| Nuveen, LLC | 117,301 | $1.30M | 0.00% | +8,455+7.8% | Added |
| Bank of New York Mellon Corp | 124,018 | $1.38M | 0.00% | +1,051+0.9% | Added |
| D. E. Shaw & Co., Inc. | 132,457 | $1.47M | 0.00% | −128,611−49.3% | Reduced |
| Gilder Gagnon Howe & Co LLC | 139,889 | $1.55M | 0.02% | −5,285−3.6% | Reduced |
| Hennion & Walsh Asset Management, Inc. | 145,932 | $1.62M | 0.05% | +30,951+26.9% | Added |
| XTX Topco Ltd | 160,501 | $1.78M | 0.03% | +121,101+307.4% | Added |
| GWM Advisors LLC | 183,000 | $2.03M | 0.01% | −17,823−8.9% | Reduced |
| Birchview Capital, LP | 195,000 | $2.17M | 1.23% | 00.0% | Unchanged |
| Bank of America Corp | 208,115 | $2.31M | 0.00% | −50,881−19.6% | Reduced |
| Catalio Capital Management, LP | 247,767 | $2.75M | 0.58% | −451,229−64.6% | Reduced |
| Avidity Partners Management LP | 249,390 | $2.77M | 0.56% | +43,314+21.0% | Added |
| Ameriprise Financial Inc | 254,219 | $2.82M | 0.00% | +68,475+36.9% | Added |
| Simplify Asset Management Inc. | 262,386 | $2.92M | 0.04% | −59,549−18.5% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 267,962 | $2.98M | 0.04% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 287,430 | $3.03M | 0.00% | −9,254−3.1% | Reduced |
| Squarepoint Ops LLC | 275,161 | $3.06M | 0.01% | +275,161 | New |
| Trexquant Investment LP | 293,305 | $3.26M | 0.02% | +156,481+114.4% | Added |
| Renaissance Technologies LLC | 305,800 | $3.40M | 0.01% | +305,800 | New |
| Vanguard Fiduciary Trust Co | 338,713 | $3.76M | 0.00% | +338,713 | New |
| UBS Group AG | 360,371 | $4.00M | 0.00% | +55,988+18.4% | Added |
| Woodline Partners LP | 369,052 | $4.10M | 0.02% | +181,761+97.0% | Added |
| Citadel Advisors LLC | 383,058 | $4.26M | 0.00% | +71,743+23.0% | Added |
| Charles Schwab Investment Management Inc | 409,015 | $4.54M | 0.00% | +11,105+2.8% | Added |
| Northern Trust Corp | 414,956 | $4.61M | 0.00% | +58,490+16.4% | Added |
| StepStone Group LP | 422,085 | $4.69M | 2.26% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 482,136 | $5.36M | 0.00% | +424,353+734.4% | Added |
| EcoR1 Capital, LLC | 625,000 | $6.94M | 0.30% | +625,000 | New |
| Goldman Sachs Group Inc | 626,196 | $6.96M | 0.00% | +234,151+59.7% | Added |
| Vanguard Portfolio Management LLC | 666,029 | $7.40M | 0.00% | +666,029 | New |
| Propel Bio Management, LLC | 841,272 | $9.35M | 5.90% | +100,354+13.5% | Added |
| Marshall Wace, LLP | 860,692 | $9.56M | 0.01% | +860,692 | New |
| Perceptive Advisors LLC | 925,000 | $10.3M | 0.20% | +925,000 | New |
| Franklin Resources Inc | 994,504 | $11.0M | 0.00% | +994,504 | New |
| SummitTX Capital, L.P. | 995,885 | $11.1M | 0.35% | +478,065+92.3% | Added |
| Nomura Asset Management International Inc. | 1,205,369 | $13.4M | 0.02% | +1,205,369 | New |
| Geode Capital Management, LLC | 1,328,045 | $14.8M | 0.00% | +254,611+23.7% | Added |
| Wasatch Advisors Inc | 1,340,916 | $14.9M | 0.10% | +9,247+0.7% | Added |
| State Street Corp | 1,386,890 | $15.4M | 0.00% | +237,354+20.6% | Added |
| GW&K Investment Management, LLC | 1,421,109 | $15.8M | 0.14% | +114,431+8.8% | Added |
| Catalys Pacific, LLC | 1,493,854 | $16.6M | 7.19% | +64,840+4.5% | Added |
| Ensign Peak Advisors, Inc | 1,627,806 | $18.1M | 0.03% | −724,214−30.8% | Reduced |
| 683 Capital Management, LLC | 1,850,000 | $20.6M | 1.91% | +65,000+3.6% | Added |
| NEA Management Company, LLC | 1,960,169 | $21.8M | 1.24% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 2,583,636 | $28.7M | 0.00% | +2,583,636 | New |
| Carlyle Group Inc. | 3,496,808 | $38.8M | 0.37% | 00.0% | Unchanged |
| Millennium Management LLC | 4,022,909 | $44.7M | 0.03% | +1,940,729+93.2% | Added |
| BlackRock, Inc. | 4,061,996 | $45.1M | 0.00% | +506,448+14.2% | Added |
| Invesco Ltd. | 4,322,060 | $48.0M | 0.00% | +401,614+10.2% | Added |
| Medicxi Ventures Management (Jersey) Ltd | 7,464,572 | $82.9M | 8.45% | 00.0% | Unchanged |
| Frazier Life Sciences Management, L.P. | 12,466,489 | $138.5M | 3.56% | 00.0% | Unchanged |
| Divisadero Street Capital Management, LP | 0 | $0 | 0.00% | −662,312−100.0% | Sold out |
| Moore Capital Management, LP | 0 | $0 | 0.00% | −600,000−100.0% | Sold out |
| Next Century Growth Investors LLC | 0 | $0 | 0.00% | −393,774−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −384,770−100.0% | Sold out |
| Caxton Associates LLP | 0 | $0 | 0.00% | −181,968−100.0% | Sold out |
| Southeast Asset Advisors Inc. | 0 | $0 | 0.00% | −42,874−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −30,488−100.0% | Sold out |
| Occidental Asset Management, LLC | 0 | $0 | 0.00% | −29,919−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −28,250−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −27,010−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −22,185−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −20,487−100.0% | Sold out |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −16,497−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −15,540−100.0% | Sold out |
| Baader Bank INC | 0 | $0 | 0.00% | −15,000−100.0% | Sold out |
| Rafferty Asset Management, LLC | 0 | $0 | 0.00% | −13,855−100.0% | Sold out |
| Scientech Research LLC | 0 | $0 | 0.00% | −12,879−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −12,867−100.0% | Sold out |
| Susquehanna Fundamental Investments, LLC | 0 | $0 | 0.00% | −11,473−100.0% | Sold out |
| Entropy Technologies, LP | 0 | $0 | 0.00% | −11,000−100.0% | Sold out |
| Axq Capital, LP | 0 | $0 | 0.00% | −10,540−100.0% | Sold out |
| 9823 Capital, L.P. | 0 | $0 | 0.00% | −10,429−100.0% | Sold out |
| Canada Pension Plan Investment Board | 0 | $0 | 0.00% | −4,600−100.0% | Sold out |
| RiverPark Advisors, LLC | 0 | $0 | 0.00% | −2,807−100.0% | Sold out |
| Kestra Advisory Services, LLC | 0 | $0 | 0.00% | −2,275−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −1,599−100.0% | Sold out |