X0609 4 2026-08-11 0001759425 Mirum Pharmaceuticals, Inc. MIRM 0001197350 BJERKHOLT ERIC false C/O MIRUM PHARMACEUTICALS, INC. 989 E HILLSDALE BLVD., SUITE 300 FOSTER CITY CA 94404 false true false false CHIEF FINANCIAL OFFICER 1 Common Stock 2026-08-11 4 S 0 6001 99.9016 D 36355 D Reported transaction occurred pursuant to a Rule 10b5-1 Plan adopted by the reporting person on March 9, 2026. . The weighted average sale price for the transaction reported was $99.901633, and the range of prices were between $99.90 and $99.93. 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. Includes 175 shares of common stock that were acquired by the Reporting Person on May 10, 2026, pursuant to the Issuer's Employee Stock Purchase Plan. /s/ Judit Ryvkin, Attorney-in-Fact 2026-08-12