Mirum views the retreat of large pharmaceutical companies from the rare disease space as a strategic opportunity. This creates a less competitive environment for acquisitions, allowing Mirum to acquire assets that are often overlooked by larger players and serve patient populations others leave behind.

A successful acquisition strategy goes beyond the highest bid. It involves 'thinking like the molecule'—evaluating which buyer has the specific expertise, capabilities, and cultural alignment to best steward the asset's development. This reframes M&A from a financial transaction to a decision about the asset's future.

The old assumption that small biotechs struggle with commercialization ("short the launch") is fading. Acquirers now target companies like Verona and Intracellular that have already built successful sales operations. This de-risks the acquisition by proving the drug's market viability before the deal, signaling a maturation of the biotech sector.

While known for late-stage acquisitions, Mirum strategically uses smaller deals for early-stage assets to expand its capabilities. The Anthoran Therapeutics deal serves as a model: a low upfront payment with a back-ended structure allows Mirum to enter early-phase development—a new area for the company—while managing financial risk.

The current biotech M&A boom is less about frantically plugging near-term patent cliff gaps (e.g., 2026-2027) and more about building long-term, strategic franchises. This forward-looking approach allows big pharma to acquire earlier-stage platforms and assets, signaling a healthier, more sustainable M&A environment.

GSK's CSO reveals their "bolt-on" deal-making focuses on late-stage clinical assets that may have failed trials or have suboptimal profiles. They acquire these assets when they believe a better trial design or repositioning can unlock the molecule's true potential, as exemplified by their acquisition of Momalotinib.

To achieve a high-value acquisition, biotechs must first build a credible strategy to succeed independently, creating a position of strength. Concurrently, leaders should keep multiple potential suitors proactively informed on all business aspects—not just clinical data—to facilitate a competitive bidding process when the time comes.

Lacking internal research capabilities, Mirum's core business model is to in-license or acquire promising assets. This strategy, initiated in 2018 with assets from Shire, relies on their proven operational team to develop and maximize the value of external innovations.

Following a cautious 2025, dealmakers now demand tangible evidence of an asset's value. This "proof over promise" approach involves conducting integration planning during due diligence and heavily favoring targets with clearer regulatory pathways to minimize post-acquisition surprises.