Mirum Pharmaceuticals, Inc.

We lease 36,318 square feet of space for our headquarters in Foster City, California under an agreement that was most recently amended in 2026. Under the amended lease, we will lease an additional 19,430 square feet for a total of 55,748 square feet with lease commencement for the additional space of the later of October 1, 2026 and fifteen days after the landlord’s substantial completion of the required tenant improvements (“Lease Commencement”). The expiry of the amended lease is five years from Lease Commencement.

We also lease approximately 6,000 square feet of space for an office in Basel, Switzerland under an agreement that expires in January 2031. Additionally, we lease approximately 7,000 square feet of office space in Zug, Switzerland that expires in June 2030. We believe that our facilities are adequate to meet our current needs, and that suitable additional alternative spaces will be available in the future on commercially reasonable terms, if needed.

After the closing of the Bluejay Acquisition, we also lease 11,125 square feet of office space in Redwood City, California under a lease agreement that expires in November 2027.