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 |
|---|---|---|---|---|---|
| Amalgamated Bank | 0 | $0 | 0.00% | −1,248−100.0% | Sold out |
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −549−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −535−100.0% | Sold out |
| MCF Advisors LLC | 0 | $0 | 0.00% | −446−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −260−100.0% | Sold out |
| Fortitude Family Office, LLC | 0 | $0 | 0.00% | −208−100.0% | Sold out |
| Caitong International Asset Management Co., Ltd | 0 | $0 | 0.00% | −28−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −6−100.0% | Sold out |
| Essential Partners LLC | 0 | $0 | 0.00% | −6−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |