On Mar. 31, 2026, Eli Lilly and Centessa Pharmaceuticals, a clinical-stage company developing a new class of medicines for the treatment of excessive daytime sleepiness and other neurological conditions, announced a definitive agreement for Lilly to acquire Centessa.

Centessa is advancing a pipeline of orexin receptor 2 (OX2R) agonists designed to address the neurobiological system critical to the sleep-wake cycle to treat excessive daytime sleepiness and disorders of impaired wakefulness. Its lead investigational candidate cleminorexton (formerly ORX750) has demonstrated a potential best-in-class profile in Phase 2a clinical studies across narcolepsy type 1, narcolepsy type 2, and idiopathic hypersomnia. Centessa’s OX2R agonist portfolio includes additional clinical and preclinical-stage assets with potential utility across a broader range of neurological, neurodegenerative, and neuropsychiatric conditions.

Under the terms of the transaction agreement, Lilly will acquire all of the issued and to be issued share capital of Centessa (including the American Depositary Shares (ADSs) representing ordinary shares) for $38.00 in cash per share plus one non-transferrable contingent value right (CVR) that entitles the holder to receive up to an aggregate of $9.00 subject to the achievement of three milestones described below, for total potential aggregate per share consideration of up to $47.00.

CVR holders would become entitled to receive contingent payments as follows: (i) $2.00 per CVR in cash, upon U.S. FDA approval of cleminorexton (formerly ORX750) or ORX142 for the treatment of narcolepsy type 2 prior to the fifth anniversary of transaction closing; (ii) $5.00 per CVR in cash, upon U.S. FDA approval of cleminorexton (formerly ORX750) or ORX142 for the treatment of idiopathic hypersomnia prior to the fifth anniversary of transaction closing; and (iii) $2.00 per CVR in cash, upon the first U.S. FDA approval of cleminorexton (formerly ORX750) or ORX142 for the treatment of any indication prior to January 1, 2030. There can be no assurance that any payments will be made with respect to the CVR.

The upfront cash consideration represents an aggregate equity value of approximately $6.3 billion and the CVR represents an additional potential aggregate equity value of approximately $1.5 billion. The transaction, which will be effectuated by way of a scheme of arrangement under the laws of England and Wales, is expected to close in the third quarter, subject to approval by Centessa shareholders, sanction by the High Court of Justice of England and Wales and satisfaction of other customary closing conditions, including regulatory approvals.