Jolanda Howe - 23 Jan 2026 Form 4 Insider Report for Mirum Pharmaceuticals, Inc. (MIRM)

Role: SVP, GLOBAL CONTROLLER
Signature: /s/ Judit Ryvkin, Attorney-in-Fact
Issuer symbol: MIRM
Transactions as of: 23 Jan 2026
Net transactions value: -$80,994
Form type: 4
Filing time: 27 Jan 2026, 16:30:12 UTC
Previous filing: 23 Jan 2026
Next filing: 30 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Howe Jolanda	SVP, GLOBAL CONTROLLER	C/O MIRUM PHARMACEUTICALS, INC., 989 E HILLSDALE BLVD., SUITE 300, FOSTER CITY	/s/ Judit Ryvkin, Attorney-in-Fact	27 Jan 2026	0001974200

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MIRM	Common Stock	Options Exercise		+1,500	+49%		4,542	23 Jan 2026	Direct	F1
transaction	MIRM	Common Stock	Sale	$80,994	-842	-19%	$96.19	3,700	26 Jan 2026	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MIRM	Restricted Stock Units	Options Exercise	$0	-1,500	-50%	$0.000000	1,500	23 Jan 2026	Common Stock	1,500		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents a contingent right to receive one share of common stock (or its cash equivalent, at the discretion of the Issuer).
F2	Shares sold to cover tax withholding obligations associated with the vesting of restricted stock units.
F3	1/3rd of the shares subject to the restricted stock units shall vest on each anniversary of January 23, 2024 (the "Vesting Commencement Date"), such that the entire award will be vested on the three-year anniversary of the Vesting Commencement Date.