Mirum Pharmaceuticals, Inc. (NASDAQ:MIRM), a leading rare disease company, today announced that on April 10, 2026, the Compensation Committee of Mirum's Board of Directors granted inducement awards consisting of non-qualified stock options to purchase 13,700 shares of common stock and 18,200 restricted stock units ("RSUs") to 12 new employees under Mirum's 2020 Inducement Plan. The Compensation Committee of Mirum's Board of Directors approved the awards as an inducement material to the new employees' employment in accordance with Nasdaq Listing Rule 5635(c)(4).

Each stock option has an exercise price of $95.20 per share, which is equal to the closing price of Mirum's common stock on April 10, 2026, and will vest over four years, with 25% of the underlying shares vesting on the one-year anniversary of the applicable vesting commencement date, and the balance of the underlying shares vesting monthly thereafter over 36 months, subject to the new employees' continued service relationship with Mirum through the applicable vesting dates. The RSUs will vest over three years, with 33% of the underlying shares vesting on each anniversary of the applicable initial vesting date, subject to the new employees' continued service relationship with Mirum through the applicable vesting dates. The awards are subject to the terms and conditions of Mirum's 2020 Inducement Plan and the terms and conditions of an applicable award agreement covering the grant.

About Mirum Pharmaceuticals

Mirum Pharmaceuticals (NASDAQ:MIRM) is a leading rare disease company with a global footprint of approved products and a broad pipeline of investigational medicines. Purpose-built to bring forward breakthrough medicines for people with overlooked conditions, Mirum combines deep rare disease expertise with strong connections to patient communities.

The company's commercial portfolio includes LIVMARLI^® (maralixibat) for Alagille syndrome (ALGS) and progressive familial intrahepatic cholestasis (PFIC), CHOLBAM^® (cholic acid) for bile-acid synthesis disorders, and CTEXLI^® (chenodiol) for cerebrotendinous xanthomatosis (CTX). Mirum's clinical-stage pipeline includes volixibat, an IBAT inhibitor in late-stage development for primary sclerosing cholangitis (PSC) and primary biliary cholangitis (PBC), brelovitug, a fully human monoclonal antibody in late-stage development for chronic hepatitis delta virus (HDV) and MRM-3379, a PDE4D inhibitor being evaluated for Fragile X syndrome (FXS).

Mirum's success is driven by a team dedicated to advancing high impact medicines through strategic development, disciplined execution and purposeful collaboration across the rare disease ecosystem. Learn more at www.mirumpharma.com and follow Mirum on Facebook, LinkedIn, Instagram and X.

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Investor Contact:

Andrew McKibben

ir@mirumpharma.com

Media Contact:

Meredith Kiernan

media@mirumpharma.com

Mirum Pharmaceuticals Reports Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)