Michael G. Grey - May 29, 2025 Form 4 Insider Report for Mirum Pharmaceuticals, Inc. (MIRM)

Role: Director
Signature: /s/ Judit Ryvkin, Attorney-in-Fact
Stock symbol: MIRM
Transactions as of: May 29, 2025
Transactions value $: $0
Form type: 4
Date filed: 6/2/2025, 07:38 PM
Previous filing: May 30, 2025
Next filing: Jul 24, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
GREY MICHAEL G	Director	C/O MIRUM PHARMACEUTICALS, INC., 989 E HILLSDALE BLVD., SUITE 300, FOSTER CITY	/s/ Judit Ryvkin, Attorney-in-Fact	2025-06-02	0001240122

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	Stock Option (right to buy)	Award	$0	+6.27K		$0.00	6.27K	May 29, 2025	Common Stock	6.27K	$44.00	Direct	F1
transaction	MIRM	Deferred Stock Units	Award	$0	+3.98K		$0.00	3.98K	May 29, 2025	Common Stock	3.98K		Direct	F2

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

Explanation of Responses:

Id	Content
F1	The shares vest on the first anniversary of the grant date, provided that the option will in any case be fully vested on the date of the Issuer's 2026 annual stockholder meeting.
F2	Each deferred stock unit represents a contingent right to receive one share of the Issuer's common stock and will vest on the first anniversary of the grant date, provided that it will in any case be fully vested on the date of the Issuer's 2026 annual stockholder meeting. Each vested deferred stock unit will be paid out in the Issuer's common stock upon the earliest to occur of (i) a change in control of the Issuer and (ii) within 60 days following separation from service with the Issuer.

Content

The shares vest on the first anniversary of the grant date, provided that the option will in any case be fully vested on the date of the Issuer's 2026 annual stockholder meeting.

Each deferred stock unit represents a contingent right to receive one share of the Issuer's common stock and will vest on the first anniversary of the grant date, provided that it will in any case be fully vested on the date of the Issuer's 2026 annual stockholder meeting. Each vested deferred stock unit will be paid out in the Issuer's common stock upon the earliest to occur of (i) a change in control of the Issuer and (ii) within 60 days following separation from service with the Issuer.