🕵️ 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 $38.7M against $9.0M of open-market buying. Peetz Christopher sold $16.0M (Aug–Jul). Janus Henderson Group PLC added 10.6% → 11.8%; Patrick J. Heron trimmed 7.6% → 6.8%. 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) · 8 sellers, $38.7M (57 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Peetz Christopher | 0 | – | 16 | $16.0M | Jul 6, 2026 |
| Michael G. Grey | 0 | – | 3 | $11.1M | Dec 19, 2025 |
| Patrick J. Heron | 1 | $9.0M | 0 | – | Jan 23, 2026 |
| Eric Bjerkholt | 0 | – | 12 | $2.7M | Jul 6, 2026 |
| Radovich Peter | 0 | – | 4 | $2.3M | Mar 16, 2026 |
| Ramasastry Saira | 0 | – | 10 | $1.9M | Jun 1, 2026 |
| Howe Jolanda | 0 | – | 7 | $1.9M | Jul 1, 2026 |
| Joanne Quan | 0 | – | 3 | $1.5M | Mar 16, 2026 |
| Brege Laura | 0 | – | 2 | $1.3M | Sep 11, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Janus Henderson Biotech Innovation Master Fund Ltd | 12.7% | 13G | May 14, 2025 | filing ↗ | |
| Janus Henderson Group PLC | 11.8% | 13G | Feb 17, 2026 | filing ↗ | |
| Patrick J. Heron | 6.8% | 13D | Jan 23, 2026 | filing ↗ | |
| James N. Topper | 6.7% | 13D | Jan 23, 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 | |
|---|---|---|---|
| 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 ↗ |
| Laura Brege | $1.3M | Sep 11, 2025 | filing ↗ |
| Saira Ramasastry | $1.3M | Sep 8, 2025 | filing ↗ |
| Christopher Peetz | $2.5M | Aug 11, 2025 | filing ↗ |
| Jolanda Marie Howe | $580K | Aug 7, 2025 | filing ↗ |
| Christopher Peetz | $2.2M | Aug 7, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| 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 ↗ |
| Reg FD disclosure (7.01) | Dec 6, 2025 | filing ↗ |
| Other events (8.01) | Dec 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 6, 2025 | filing ↗ |