SCHEDULE 13D/A

Mirum Pharmaceuticals Inc

Common Stock, par value $0.0001 per share · CUSIP: 604749101

Event date: 2025-08-18

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Frazier Life Sciences IX, L.P.Reported CIK 0001720320

  Shares: 3,566,912.00 · Class: 7.1%

• FHMLS IX, L.P.Reported CIK 0001782789

  Shares: 3,566,912.00 · Class: 7.1%

• FHMLS IX, L.L.C.Reported CIK 0001782791

  Shares: 3,566,912.00 · Class: 7.1%

• Frazier Life Sciences X, L.P.Reported CIK 0001790879

  Shares: 168,308.00 · Class: 0.3%

• FHMLS X, L.P.Reported CIK 0001790880

  Shares: 168,308.00 · Class: 0.3%

• FHMLS X, L.L.C.Reported CIK 0001790811

  Shares: 168,308.00 · Class: 0.3%

• Frazier Life Sciences Public Fund, L.P.Reported CIK 0001863769

  Shares: 1,574,374.00 · Class: 3.1%

• FHMLSP, L.P.Reported CIK 0001879466

  Shares: 1,574,374.00 · Class: 3.1%

• FHMLSP, L.L.C.Reported CIK 0001879465

  Shares: 1,574,374.00 · Class: 3.1%

• Frazier Life Sciences Public Overage Fund, L.P.Reported CIK 0001913804

  Shares: 940,573.00 · Class: 1.9%

• FHMLSP Overage, L.P.Reported CIK 0001963247

  Shares: 940,573.00 · Class: 1.9%

• FHMLSP Overage, L.L.C.Reported CIK 0001963248

  Shares: 940,573.00 · Class: 1.9%

• Frazier Life Sciences XI, L.P.Reported CIK 0001911592

  Shares: 544,954.00 · Class: 1.1%

• FHMLS XI, L.P.Reported CIK 0001911580

  Shares: 544,954.00 · Class: 1.1%

• FHMLS XI, L.L.C.Reported CIK 0001911623

  Shares: 544,954.00 · Class: 1.1%

• James N. TopperReported CIK 0001341382

  Shares: 3,735,220.00 · Class: 7.4%

• Patrick J. HeronReported CIK 0001365617

  Shares: 3,735,220.00 · Class: 7.6%

• Albert ChaReported CIK 0001397906

  Shares: 0.00 · Class: 0.0%

• James BrushReported CIK 0001865123

  Shares: 0.00 · Class: 0.0%

• Daniel EstesReported CIK 0001702527

  Shares: 0.00 · Class: 0.0%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.