🕵️ Mirum Pharmaceuticals, Inc. ($MIRM)
SEC insider & ownership activity, last 12 months · CIK 1759425 · every row links its SEC filing
Over the last 12 months insiders sold $42.2M against $9.0M of open-market buying. Peetz Christopher sold $16.3M (Jan–Sep). Patrick J. Heron trimmed 7.6% → 6.8%; James N. Topper trimmed 7.4% → 6.7%. No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $9.0M (1 lots) · 7 sellers, $42.2M (59 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Peetz Christopher | 0 | – | 19 | $16.3M | Sep 1, 2026 |
| Michael G. Grey | 0 | – | 3 | $11.1M | Dec 19, 2025 |
| Patrick J. Heron | 1 | $9.0M | 0 | – | Jan 23, 2026 |
| Howe Jolanda | 0 | – | 9 | $5.6M | Sep 2, 2026 |
| Eric Bjerkholt | 0 | – | 12 | $3.6M | Sep 14, 2026 |
| Radovich Peter | 0 | – | 4 | $2.3M | Mar 16, 2026 |
| Ramasastry Saira | 0 | – | 9 | $1.9M | Jun 1, 2026 |
| Joanne Quan | 0 | – | 3 | $1.5M | Mar 16, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Janus Henderson Biotech Innovation Master Fund Ltd | 12.7% | 13G | May 14, 2025 | filing ↗ | |
| Janus Henderson Group Ltd. | 9.7% | 13G | Aug 13, 2026 | filing ↗ | |
| Patrick J. Heron | 6.8% | 13D | Jan 23, 2026 | filing ↗ | |
| James N. Topper | 6.7% | 13D | Jan 23, 2026 | filing ↗ | |
| FMR LLC | 6.2% | 13G | Aug 6, 2026 | filing ↗ | |
| Abigail P. Johnson | 6.2% | 13G | Aug 6, 2026 | filing ↗ | |
| Frazier Life Sciences IX, L.P. | 5.9% | 13D | Jan 23, 2026 | filing ↗ | |
| Fhmls IX, L.P. | 5.9% | 13D | Jan 23, 2026 | filing ↗ | |
| Fhmls IX, L.L.C. | 5.9% | 13D | Jan 23, 2026 | filing ↗ | |
| BlackRock, Inc. | 5.7% | 13G | Apr 27, 2026 | filing ↗ | |
| Finny Kuruvilla, M.D., PH. D. | 5.4% | 13G | Feb 14, 2025 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Eric Bjerkholt | $978K | Sep 14, 2026 | filing ↗ |
| Jolanda Marie Howe | $66K | Sep 2, 2026 | filing ↗ |
| Christopher Peetz | $3.0M | Sep 1, 2026 | filing ↗ |
| Jolanda Marie Howe | $4.0M | Aug 18, 2026 | filing ↗ |
| Eric Bjerkholt | $600K | Aug 11, 2026 | filing ↗ |
| Christopher Peetz | $2.0M | Aug 10, 2026 | filing ↗ |
| Jolanda Marie Howe | $194K | Aug 3, 2026 | filing ↗ |
| Christopher Peetz | $2.4M | Jul 6, 2026 | filing ↗ |
| Eric Bjerkholt | $611K | Jul 6, 2026 | filing ↗ |
| Jolanda Marie Howe | $327K | Jul 1, 2026 | filing ↗ |
| Jolanda Marie Howe | $264K | Jun 17, 2026 | filing ↗ |
| Eric Bjerkholt | $469K | Jun 8, 2026 | filing ↗ |
| Christopher Peetz | $2.9M | Jun 1, 2026 | filing ↗ |
| Saira Ramasastry | $398K | Jun 1, 2026 | filing ↗ |
| Saira Ramasastry | $219K | May 15, 2026 | filing ↗ |
| Saira Ramasastry | $194K | Apr 15, 2026 | filing ↗ |
| Jolanda Howe | $438K | Mar 16, 2026 | filing ↗ |
| Saira Ramasastry | $182K | Mar 16, 2026 | filing ↗ |
| Joanne Quan | $675K | Mar 16, 2026 | filing ↗ |
| Peter Radovich | $1.5M | Mar 16, 2026 | filing ↗ |
| Christopher Peetz | $3.8M | Mar 16, 2026 | filing ↗ |
| Eric Bjerkholt | $675K | Mar 16, 2026 | filing ↗ |
| Saira Ramasastry | $204K | Feb 13, 2026 | filing ↗ |
| Jolanda Howe | $100K | Feb 2, 2026 | filing ↗ |
| Peter Radovich | $273K | Feb 2, 2026 | filing ↗ |
| Christopher Peetz | $945K | Feb 2, 2026 | filing ↗ |
| Jolanda Howe | $82K | Jan 26, 2026 | filing ↗ |
| Peter Radovich | $305K | Jan 26, 2026 | filing ↗ |
| Christopher Peetz | $662K | Jan 26, 2026 | filing ↗ |
| Eric Bjerkholt | $102K | Jan 26, 2026 | filing ↗ |
| Saira Ramasastry | $182K | Jan 15, 2026 | filing ↗ |
| Saira Ramasastry | $400K | Dec 22, 2025 | filing ↗ |
| Michael Grey | $3.9M | Dec 19, 2025 | filing ↗ |
| Saira Ramasastry | $139K | Dec 18, 2025 | filing ↗ |
| Michael Grey | $3.7M | Dec 1, 2025 | filing ↗ |
| Michael Grey | $3.5M | Nov 21, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | Sep 2, 2026 | filing ↗ |
| Earnings (2.02) | Aug 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 5, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 15, 2026 | filing ↗ |
| Material agreement (1.01) | May 12, 2026 | filing ↗ |
| New financial obligation (2.03) | May 12, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | May 12, 2026 | filing ↗ |
| Other events (8.01) | May 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 12, 2026 | filing ↗ |
| Earnings (2.02) | May 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 6, 2026 | filing ↗ |
| Other events (8.01) | May 4, 2026 | filing ↗ |
| Other events (8.01) | Apr 27, 2026 | filing ↗ |
| Earnings (2.02) | Feb 25, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 25, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 23, 2026 | filing ↗ |
| Acquisition or disposition (2.01) | Jan 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 23, 2026 | filing ↗ |
| Other events (8.01) | Jan 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 23, 2026 | filing ↗ |
| Earnings (2.02) | Jan 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 12, 2026 | filing ↗ |
| Other events (8.01) | Dec 19, 2025 | filing ↗ |
| Material agreement (1.01) | Dec 18, 2025 | filing ↗ |
| Unregistered equity sale (3.02) | Dec 18, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 18, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 18, 2025 | filing ↗ |
| Material agreement (1.01) | Dec 6, 2025 | filing ↗ |
| Unregistered equity sale (3.02) | Dec 6, 2025 | filing ↗ |