• Expands Sobi's pipeline with a highly differentiated new Phase 3 asset in Gout
• Acquisition expected to be highly accretive to Sobi's mid- to long-term growth and margin trajectory

Sobi® (STO: SOBI) has entered into a definitive agreement to acquire Arthrosi Therapeutics, Inc. (Arthrosi), a private late-stage biotechnology company focused on developing a next-generation treatment for gout. The acquisition strengthens Sobi's gout franchise by adding pozdeutinurad (AR882), an investigational next-generation, once-daily oral URAT1 inhibitor currently being evaluated in two fully recruited global Phase 3 clinical studies for the potential management of progressive and tophaceous gout and expected to read out in 2026. Pozdeutinurad complements Sobi's pipeline by adding a potentially best-in-class URAT1 inhibitor for patients sub-optimally treated with first-line therapies. Today's announcement reflects Sobi's commitment to advancing treatment options for people living with gout.

"The acquisition of Arthrosi allows us to expand our gout pipeline with a highly differentiated new asset", said Guido Oelkers, President and CEO of Sobi. "Pozdeutinurad has the potential to become the therapy of choice for patients who have progressive gout with persistent and unresolved symptoms despite first-line therapy. The product has the potential to materially accelerate our growth until the mid 2030s, and beyond. We welcome all members of the talented Arthrosi team and are looking forward to working closely together to be able to offer this therapy to patients as soon as possible."

"We are thrilled to join forces with Sobi and look forward to working together to ensure a seamless transition as they advance pozdeutinurad towards pivotal data and potential regulatory filings. We believe that Sobi's global expertise in commercialisation will accelerate our shared mission to deliver pozdeutinurad's potentially transformative benefits for individuals living with gout", stated Litain Yeh, Ph.D., Founder and CEO of Arthrosi Therapeutics.

Transaction details
Under the terms of the agreement, Sobi will pay USD 950 million (approximately SEK 9.1 billion) upfront in cash to acquire Arthrosi, together with up to USD 550 m (approximately SEK 5.3 billion) in cash in clinical, regulatory and sales milestones.

The transaction is subject to the satisfaction of customary closing conditions and is expected to close in H1 2026.

Sobi plans to fund the upfront payment mainly through debt in the form of existing credit facilities and a new credit facility provided by Handelsbanken and Danske Bank.

The acquisition is expected to be highly accretive to Sobi's mid- to long-term growth and margin trajectory.

Barclays Bank PLC is acting as Sobi's financial advisor and McDermott, Will & Schulte is acting as legal advisor to Sobi on this transaction.