Jolanda Howe - May 1, 2023 Form 3 Insider Report for Mirum Pharmaceuticals, Inc. (MIRM)

Role: SVP, Global Controller
Signature: /s/ Judit Ryvkin, Attorney-in-Fact
Stock symbol: MIRM
Transactions as of: May 1, 2023
Transactions value $: $0
Form type: 3
Date filed: 5/9/2023, 05:07 PM
Next filing: Jul 5, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	MIRM	Common Stock						1.77K	May 1, 2023	Direct

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
holding	MIRM	Stock Option (right to buy)							May 1, 2023	Common Stock	57.9K	$2.94	Direct	F1
holding	MIRM	Stock Option (right to buy)							May 1, 2023	Common Stock	50K	$6.27	Direct	F2
holding	MIRM	Stock Option (right to buy)							May 1, 2023	Common Stock	25K	$19.24	Direct	F3
holding	MIRM	Stock Option (right to buy)							May 1, 2023	Common Stock	25K	$19.19	Direct	F4
holding	MIRM	Stock Option (right to buy)							May 1, 2023	Common Stock	22.5K	$15.87	Direct	F5
holding	MIRM	Stock Option (right to buy)							May 1, 2023	Common Stock	18.8K	$19.98	Direct	F6
holding	MIRM	Stock Option (right to buy)							May 1, 2023	Common Stock	21.3K	$23.48	Direct	F7
holding	MIRM	Restricted Stock Units							May 1, 2023	Common Stock	2.5K		Direct	F8, F9
holding	MIRM	Restricted Stock Units							May 1, 2023	Common Stock	3.13K		Direct	F9, F10
holding	MIRM	Restricted Stock Units							May 1, 2023	Common Stock	5.32K		Direct	F9, F11
holding	MIRM	Performance Restricted Stock Units							May 1, 2023	Common Tcok	1.56K		Direct	F9, F12

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

Explanation of Responses:

Id	Content
F1	1/4th of the 62,500 shares originally subject to the option vested one year after February 28, 2019, and the balance of the shares vest in a series of 36 successive equal monthly installments at the end of each month thereafter.
F2	1/4th of the shares vested one year after April 12, 2019 (the "Vesting Commencement Date") and the balance of the shares vest in a series of 36 successive equal monthly installments measured from the first anniversary of the Vesting Commencement Date.
F3	1/4th of the shares vested one year after January 10, 2020 (the "Vesting Commencement Date") and the balance of the shares vest in a series of 36 successive equal monthly installments measured from the first anniversary of the Vesting Commencement Date.
F4	1/4th of the shares vested one year after January 7, 2021 (the "Vesting Commencement Date") and the balance of the shares vest in a series of 36 successive equal monthly installments measured from the first anniversary of the Vesting Commencement Date.
F5	1/4th of the shares vested one year after January 6, 2022 (the "Vesting Commencement Date") and the balance of the shares vest in a series of 36 successive equal monthly installments measured from the first anniversary of the Vesting Commencement Date.
F6	1/4th of the shares vest one year after July 1, 2022 (the "Vesting Commencement Date") and the balance of the shares vest in a series of 36 successive equal monthly installments measured from the first anniversary of the Vesting Commencement Date.
F7	1/4th of the shares vest one year after January 31, 2023 (the "Vesting Commencement Date) and the balance of the shares vest in a series of 36 successive equal monthly installments measured from the first anniversary of the Vesting Commencement Date.
F8	The restricted stock units vest in a series of three successive equal annual installments beginning January 6, 2023. 1,250 shares vested January 6, 2023 and the remaining 2,500 shares vest ratably on January 6, 2024 and January 6, 2025.
F9	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).
F10	The restricted stock units vest in a series of three successive equal annual installments beginning July 1, 2023.
F11	The restricted stock units vest in a series of three successive equal annual installments beginning January 31, 2024.
F12	On March 9, 2021, the reporting person was granted performance-based restricted stock units ("PSUs"), which vest upon the satisfaction of certain performance criteria. On September 29, 2021, such performance criteria were met. 1,562 shares subject to the PSUs vested on September 29, 2021, and 1,563 shares vest on June 30, 2023.