144 0001614740 XXXXXXXX LIVE 0001759425 MIRUM PHARMACEUTICALS, INC. 001-38981 989 E HILLSDALE BLVD., SUITE 300 FOSTER CITY CA 94404 650-667-4085 Christopher Peetz Officer Director Common Stock Morgan Stanley Smith Barney LLC

1 New York Plaza, 8th Floor New York NY 10004

6831 662060.52 51393574 01/26/2026 NASDAQ Common Stock 01/23/2026 Restricted Stock Units vesting under registered plan Issuer N 6831 01/23/2026 Compensation for services rendered to Issuer N Christopher Peetz

c/o Mirum Pharmaceuticals, Inc. 989 E Hillsdale Blvd., Suite 300 Foster City CA 94404

Common Stock 01/22/2026 7098 662422.46 This is a sell-to-cover transaction for taxes owed related to recent vesting of stock unit awards granted by the Issuer. 01/28/2026 01/23/2024 /s/ Christopher Peetz