X0206 3 2019-07-17 0 0001759425 Mirum Pharmaceuticals, Inc. MIRM 0001237289 SANDELL SCOTT D 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 Series A Preferred Stock Common Stock 3736243 I See Note 3 The shares of Series A Preferred Stock have no expiration date and are convertible at any time at the election of the holder without payment of further consideration. Each share of Series A Preferred Stock will automatically convert into 0.125 shares of Common Stock upon the closing of the Issuer's initial public offering. Share numbers give effect to the reverse split of each share of the Issuer's Common Stock into 0.125 shares of Common Stock effected on July 3, 2019, which will be effective for the Preferred Stock upon its conversion to Common Stock upon the closing of the Issuer's initial public offering. 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. /s/ Sasha Keough, attorney-in-fact 2019-07-17