Patrick J. Heron - 23 Jan 2026 Form 4 Insider Report for Mirum Pharmaceuticals, Inc. (MIRM)

Role
Director
Signature
/s/ Jennifer Martin, Attorney-in-Fact For Patrick J. Heron
Issuer symbol
MIRM
Transactions as of
23 Jan 2026
Net transactions value
+$8,999,984
Form type
4
Filing time
27 Jan 2026, 16:14:26 UTC
Previous filing
30 Sep 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Heron Patrick J Director C/O MIRUM PHARMACEUTICALS, INC., 989 E. HILLSDALE BLVD., SUITE 300, FOSTER CITY /s/ Jennifer Martin, Attorney-in-Fact For Patrick J. Heron 27 Jan 2026 0001365617

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIRM Common Stock Other +159,277 +95% 327,585 23 Jan 2026 By Frazier Life Sciences X, L.P. F1, F2
transaction MIRM Common Stock Purchase $8,999,984 +131,425 +40% $68.48 459,010 23 Jan 2026 By Frazier Life Sciences X, L.P. F2
holding MIRM Common Stock 3,566,912 23 Jan 2026 By Frazier Life Sciences IX, L.P. F3
holding MIRM Common Stock 5,703 23 Jan 2026 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Frazier Life Sciences X, L.P. received these shares in connection with merger of Bluejay Therapeutics, Inc. into the Issuer (the "Merger"). On the effective date of the Merger, the closing price of the Issuer's Common Stock was $94.29 per share.
F2 The shares are held directly by Frazier Life Sciences X, L.P. FHMLS X, L.P. is the general partner of Frazier Life Sciences X, L.P. and FHMLS X, L.L.C. is the general partner of FHMLS X, L.P. The Reporting Person is one of two managing members of FHMLS X, L.L.C. The Reporting Person disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.
F3 The shares are held directly by Frazier Life Sciences IX, L.P. FHMLS IX, L.P. is the general partner of Frazier Life Sciences IX, L.P. FHMLS IX, L.L.C. is the general partner of FHMLS IX, L.P. The Reporting Person is one of two managing members of FHMLS IX, L.L.C. The Reporting Person disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.