X0609 4 2026-07-06 0001759425 Mirum Pharmaceuticals, Inc. MIRM 0001614740 Peetz Christopher false C/O MIRUM PHARMACEUTICALS, INC. 989 E HILLSDALE BLVD., SUITE 300 FOSTER CITY CA 94404 true true false false CHIEF EXECUTIVE OFFICER 1 Common Stock 2026-07-06 4 M 0 20000 2.936 A 214309 D Common Stock 2026-07-06 4 S 0 12134 121.65 D 202175 D Common Stock 2026-07-06 4 S 0 4181 122.34 D 197994 D Common Stock 2026-07-06 4 S 0 1975 123.74 D 196019 D Common Stock 2026-07-06 4 S 0 1710 124.79 D 194309 D Common Stock 187500 I By The Peetz Family Trust Employee Stock Option (right to buy) 2.936 2026-07-06 4 M 0 20000 0 D 2029-03-11 Common Stock 20000 108487 D Reported transaction occurred pursuant to a Rule 10b5-1 Plan adopted by the reporting person on March 2, 2026. The weighted average sale price for the transaction reported was $121.65, and the range of prices were between $121.11 and $122.105. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price will be provided. The weighted average sale price for the transaction reported was $122.34, and the range of prices were between $122.13 and $123.1125. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price will be provided. The weighted average sale price for the transaction reported was $123.74, and the range of prices were between $123.24 and $124.10. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price will be provided. The weighted average sale price for the transaction reported was $124.79, and the range of prices were between $124.27 and $124.94. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price will be provided. The stock option is fully vested. /s/ Judit Ryvkin, Attorney-in-Fact 2026-07-08