X0609 4 2026-06-15 0001759425 Mirum Pharmaceuticals, Inc. MIRM 0001547959 Ramasastry Saira false C/O MIRUM PHARMACEUTICALS, INC. 989 E HILLSDALE BLVD., SUITE 300 FOSTER CITY CA 94404 true false false false 0 Stock Option (right to buy) 101 2026-06-15 4 A 0 3772 0 A 2036-06-14 Common Stock 3772 3772 D Restricted Stock Units 2026-06-15 4 A 0 1980 0 A Common Stock 1980 1980 D The shares vest on the first anniversary of the grant date, provided that the option will in any case be fully vested on the date of the Issuer's 2027 annual stockholder meeting. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock and will vest on the first anniversary of the grant date, provided that it will in any case be fully vested on the date of the Issuer's 2027 annual stockholder meeting. /s/ Doug Sheehy, Attorney-in-Fact 2026-06-17