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

Role: CHIEF EXECUTIVE OFFICER, Director
Signature: /s/ Judit Ryvkin, Attorney-in-Fact
Issuer symbol: MIRM
Transactions as of: 23 Jan 2026
Net transactions value: -$657,088
Form type: 4
Filing time: 27 Jan 2026, 16:30:08 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
Peetz Christopher	CHIEF EXECUTIVE OFFICER, Director	C/O MIRUM PHARMACEUTICALS, INC., 989 E HILLSDALE BLVD., SUITE 300, FOSTER CITY	/s/ Judit Ryvkin, Attorney-in-Fact	27 Jan 2026	0001614740

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MIRM	Common Stock	Options Exercise		+12,500	+7.6%		176,233	23 Jan 2026	Direct	F1
transaction	MIRM	Common Stock	Sale	$657,088	-6,831	-3.9%	$96.19	169,402	26 Jan 2026	Direct	F2
holding	MIRM	Common Stock						187,500	23 Jan 2026	By The Peetz Family Trust

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	-12,500	-50%	$0.000000	12,500	23 Jan 2026	Common Stock	12,500		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 the Issuer's common stock.
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.