Form 4 for MIRM Mirum Pharmaceuticals, Inc.

Accepted 2026-01-23 00:00:00 ET · period of report 2026-01-21 · accession 0001197350-26-000001 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-01-23	2026-01-22	MIRM	BJERKHOLT ERIC	CFO	S - Sale+OE	$93.33	-1,421	42.1K	-3%	-$132.6K
D	2026-01-23	2026-01-21	MIRM	BJERKHOLT ERIC	CFO	M - OptEx	—	+3,334	43.5K	+8%	—
D	2026-01-23	2026-01-21	MIRM	BJERKHOLT ERIC	CFO	M - OptEx	$0.00	-3,334	6,666	-33%	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-01-22	S	D	1,421	$93.33	42,127	D	—	—	(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).
2	Common	Common Stock	2026-01-21	M	A	3,334	—	43,548	D	—	—	(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) Includes 269 shares of common stock that were acquired by the Reporting Person on November 10, 2025, pursuant to the Issuer's Employee Stock Purchase Plan.
3	Derivative	Restricted Stock Units	2026-01-21	M	D	3,334	$0.00	6,666	D	— · — to —	3,334 Common Stock	(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). (F4) 1/3rd of the shares subject to the restricted stock units shall vest on each anniversary of January 21, 2025 (the "Vesting Commencement Date"), such that the entire award will be vested on the three-year anniversary of the Vesting Commencement Date.