X0306 4 2019-07-22 0 0001759425 Mirum Pharmaceuticals, Inc. MIRM 0001237289 SANDELL SCOTT D 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 Common Stock 2019-07-22 4 C 0 3736243 A 3736243 I See Note 2 Common Stock 2019-07-22 4 P 0 450000 15.00 A 4186243 I See Note 2 Series A Preferred Stock 2019-07-22 4 C 0 29889945 0.00 D Common Stock 3736243 0 I See Note 2 Automatic conversion, in connection with the Issuer's initial public offering, of each share of the Issuer's Series A preferred stock into 0.125 shares of the Issuer's common stock. The shares have no expiration date. The Reporting Person is a manager of NEA 16 GP, LLC, ("NEA 16 GP") which is the sole general partner of NEA Partners 16, L.P. ("NEA Partners 16"). NEA Partners 16 is the sole general partner of New Enterprise Associates 16, L.P. ("NEA 16"), which is the direct beneficial owner of the shares. The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the shares held by NEA 16 in which the Reporting Person has no pecuniary interest. The shares were purchased in the Issuer's initial public offering. /s/ Sasha Keough, attorney-in-fact 2019-07-24