Quan Joanne 4

4 · Mirum Pharmaceuticals, Inc. · Filed Jan 30, 2026

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Updated Jan 30, 2026

Mirum (MIRM) CMO Joanne Quan Receives 49,900-Share Award

What Happened

Joanne Quan, Chief Medical Officer of Mirum Pharmaceuticals (MIRM), received three equity awards on January 28, 2026 totaling 49,900 restricted stock units/performance RSUs: 18,140 RSUs, 11,760 RSUs, and 20,000 PSUs. All were reported as awards (transaction code A) with a $0 purchase price (derivative awards), so no cash was exchanged at grant.

Key Details

Transaction date: January 28, 2026 (Form 4 filed January 30, 2026 — timely).
Reported price: $0.00 per share (awards/derivatives); Form 4 shows $0 total value for the grant entries.
Shares owned after the transaction: not specified in the filing.
Footnote highlights:
- F2: Each restricted stock unit represents a contingent right to receive one share of common stock.
- F1 (applies to one award): 25% vests one year after the January 28, 2026 vesting commencement date; remaining shares vest in 36 equal monthly installments thereafter.
- F3 (applies to one award): 1/3 vests on each anniversary of January 28, 2026 (fully vested after 3 years).
- F4 (applies to PSUs): These were PSUs granted Jan 23, 2024; performance criteria were met Jan 28, 2026. Vesting: 2/3 of the PSUs vest March 15, 2026, and 1/3 vest March 15, 2027.
Transaction type: Awards/grants (derivative RSUs/PSUs), not open-market purchases or sales.

Context

These are compensation-related equity awards and do not involve a cash purchase or sale of stock at grant; they will convert to shares only as they vest (and for PSUs, upon satisfaction of performance conditions).
Such grants are routine for executive compensation and are not direct signals of buying or selling by the insider.

Form 4

Period: 2026-01-28

CHIEF MEDICAL OFFICER

Transactions

Award
Stock Option (right to buy)
[F1]
2026-01-28+18,140→ 18,140 total
Exercise: $100.85Exp: 2036-01-27→ Common Stock (18,140 underlying)
Award
Restricted Stock Units
[F2][F3]
2026-01-28+11,760→ 11,760 total
→ Common Stock (11,760 underlying)
Award
Performance Restricted Stock Units
[F2][F4]
2026-01-28+20,000→ 20,000 total
→ Common Stock (20,000 underlying)

Footnotes (4)

[F1]1/4th of the shares vest one year after January 28, 2026 (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.
[F2]Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
[F3]1/3rd of the shares subject to the restricted stock units shall vest on each anniversary of January 28, 2026 (the "Vesting Commencement Date"), such that the entire award will be vested on the three-year anniversary of the Vesting Commencement Date.
[F4]On January 23, 2024, the reporting person was granted performance restricted stock units ("PSUs") which vest upon satisfaction of certain performance criteria. On January 28, 2026, performance criteria were determined to have been met. The shares subject to the PSUs vest as follows: 2/3 of the shares vest on March 15, 2026 and 1/3 of the shares vest on March 15, 2027.

Signature

/s/ Judit Ryvkin, Attorney-in-Fact|2026-01-30

1 file