Mirum Pharmaceuticals's three largest insider shareholders as of September 29, 2026 are James E Flynn (TenPercentOwner, 3.24Mn shares), Scott D Sandell (TenPercentOwner, 2.20Mn shares), Anthony A. Jr. Florence (TenPercentOwner, 2.20Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | James E Flynn | TenPercentOwner, Other | 0 | 3,244,434 | 3,244,434 | 12.5% | 08 Jun, 2022 |
| 2 | Scott D Sandell | TenPercentOwner | 0 | 2,199,372 | 2,199,372 | 8.5% | 15 Jun, 2023 |
| 3 | Anthony A. Jr. Florence | TenPercentOwner | 384 | 2,197,591 | 2,197,975 | 8.5% | 15 Jun, 2023 |
| 4 | Mohamad Makhzoumi | TenPercentOwner | 0 | 2,197,744 | 2,197,744 | 8.5% | 15 Jun, 2023 |
| 5 | Forest Baskett | TenPercentOwner | 0 | 2,187,791 | 2,187,791 | 8.5% | 15 Jun, 2023 |
| 6 | Ali Behbahani | TenPercentOwner | 0 | 2,186,378 | 2,186,378 | 8.5% | 15 Jun, 2023 |
| 7 | Carmen Chang | TenPercentOwner | 135 | 2,186,243 | 2,186,378 | 8.5% | 15 Jun, 2023 |
| 8 | Paul Edward Walker | TenPercentOwner | 0 | 2,186,357 | 2,186,357 | 8.5% | 15 Jun, 2023 |
| 9 | Partners 16, L.P. Nea | TenPercentOwner | 0 | 2,186,243 | 2,186,243 | 8.5% | 15 Jun, 2023 |
| 10 | Enterprise Associates 16, L.P. New | TenPercentOwner | 2,186,243 | 0 | 2,186,243 | 8.5% | 15 Jun, 2023 |
| 11 | Niall O'Donnell | Director | 0 | 1,621,118 | 1,621,118 | 6.3% | 15 Nov, 2022 |
| 12 | Patrick J Heron | Director | 0 | 459,010 | 459,010 | 1.8% | 27 Jan, 2026 |
| 13 | Christopher Peetz | Chief Executive Officer | 263,967 | 0 | 263,967 | 1.0% | 03 Sep, 2026 |
| 14 | Michael G Grey | Executive Chairman | 0 | 186,410 | 186,410 | 0.7% | 01 Oct, 2024 |
| 15 | Lara Longpre | Chief Development Officer | 104,407 | 0 | 104,407 | 0.4% | 05 Feb, 2024 |
| 16 | Peter Radovich | President And Coo | 57,260 | 0 | 57,260 | 0.2% | 08 Jun, 2026 |
| 17 | Edwin Jonathan Tucker | Chief Medical Officer | 45,838 | 0 | 45,838 | 0.2% | 15 Nov, 2021 |
| 18 | Eric Bjerkholt | Chief Financial Officer | 44,745 | 0 | 44,745 | 0.2% | 15 Sep, 2026 |
| 19 | Ian Clements | Chief Financial Officer | 30,011 | 0 | 30,011 | 0.1% | 14 Nov, 2022 |
| 20 | Pamela Vig | Chief Scientific Officer | 27,406 | 0 | 27,406 | 0.1% | 25 Jun, 2024 |
| 21 | Joanne Quan | Chief Medical Officer | 18,864 | 0 | 18,864 | 0.1% | 17 Mar, 2026 |
| 22 | Laura Brege | Director | 15,703 | 0 | 15,703 | 0.1% | 12 Sep, 2025 |
| 23 | Laurent Fischer | Director | 10,727 | 0 | 10,727 | 0.0% | 02 Jun, 2026 |
| 24 | Lon Cardon | Director | 9,680 | 0 | 9,680 | 0.0% | 02 Jun, 2026 |
| 25 | Timothy P Walbert | Director | 9,680 | 0 | 9,680 | 0.0% | 02 Jun, 2026 |
| 26 | William Fairey | Director | 2,500 | 0 | 2,500 | 0.0% | 12 Jun, 2025 |
| 27 | Jolanda Howe | Svp, Global Controller | 616 | 0 | 616 | 0.0% | 03 Sep, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 01 Sep, 2026 | Christopher Peetz | Chief Executive Officer | Acquired M | 30,000 | $2.94 | $88.08K | 224,440 | Direct |
| 02 Sep, 2026 | Jolanda Howe | Svp, Global Controller | Disposed S | 658 | $100.00 | $65.80K | 616 | Direct |
| 01 Sep, 2026 | Christopher Peetz | Chief Executive Officer | Disposed S | 8,312 | $98.08 | $815.24K | 216,128 | Direct |
| 01 Sep, 2026 | Christopher Peetz | Chief Executive Officer | Disposed S | 21,688 | $98.91 | $2.15Mn | 194,440 | Direct |
| 01 Sep, 2026 | Christopher Peetz | Chief Executive Officer | Disposed M | 30,000 | $0.00 | $0 | 58,487 | Direct |
| 18 Aug, 2026 | Jolanda Howe | Svp, Global Controller | Acquired M | 40,000 | $6.27 | $250.80K | 41,274 | Direct |
| 18 Aug, 2026 | Jolanda Howe | Svp, Global Controller | Disposed S | 40,000 | $100.00 | $4.00Mn | 1,274 | Direct |
| 18 Aug, 2026 | Jolanda Howe | Svp, Global Controller | Disposed M | 40,000 | $0.00 | $0 | 0 | Direct |
| 11 Aug, 2026 | Eric Bjerkholt | Chief Financial Officer | Disposed S | 6,001 | $99.90 | $599.51K | 36,355 | Direct |
| 10 Aug, 2026 | Christopher Peetz | Chief Executive Officer | Acquired M | 20,000 | $2.94 | $58.72K | 214,309 | Direct |
| 10 Aug, 2026 | Christopher Peetz | Chief Executive Officer | Disposed S | 11,683 | $98.51 | $1.15Mn | 202,626 | Direct |
| 10 Aug, 2026 | Christopher Peetz | Chief Executive Officer | Disposed S | 6,017 | $99.25 | $597.19K | 196,609 | Direct |
| 10 Aug, 2026 | Christopher Peetz | Chief Executive Officer | Disposed S | 2,300 | $100.14 | $230.32K | 194,309 | Direct |
| 10 Aug, 2026 | Christopher Peetz | Chief Executive Officer | Disposed M | 20,000 | $0.00 | $0 | 88,487 | Direct |
| 03 Aug, 2026 | Jolanda Howe | Svp, Global Controller | Disposed S | 1,840 | $105.29 | $193.73K | 1,274 | Direct |
| 06 Jul, 2026 | Eric Bjerkholt | Chief Financial Officer | Disposed S | 3,124 | $121.67 | $380.10K | 44,057 | Direct |
| 06 Jul, 2026 | Christopher Peetz | Chief Executive Officer | Acquired M | 20,000 | $2.94 | $58.72K | 214,309 | Direct |
| 06 Jul, 2026 | Christopher Peetz | Chief Executive Officer | Disposed S | 12,134 | $121.65 | $1.48Mn | 202,175 | Direct |
| 06 Jul, 2026 | Eric Bjerkholt | Chief Financial Officer | Disposed S | 1,048 | $122.43 | $128.31K | 43,009 | Direct |
| 06 Jul, 2026 | Eric Bjerkholt | Chief Financial Officer | Disposed S | 528 | $123.84 | $65.39K | 42,481 | Direct |