Operating without a sales foothold in North America, then-Sumitomo Dainippon Pharma acquired NASDAQ-traded Sepracor for $2.6B in 2010, renaming its new stand-alone subsidiary Sunovion.

[6] Under Sunovion management, Sumitomo Dainippon Pharma was able to successfully market its $2B blockbuster drug Latuda in North America, an atypical antipsychotic approved for the treatment of schizophrenia and depressive episodes associated with Bipolar I disorder.

With the deal, Sunovion would acquire Cynapsus' then-Phase III Parkinson's disease candidate drug Kynmobi,[7] a sublingual formulation of apomorphine.

[9] In October 2022, Sumitomo Pharma announced the acquisition of all outstanding shares in Myovant, a former Roivant subsidiary it was previously a majority owner of, valuing the company at $2.9B.

[10] Following the Myovant acquisition in April 2023, Sumitomo Pharma consolidated its US subsidiaries to form Sumitomo Pharma America (SMPA), a biopharmaceutical company focused on delivering therapeutic and scientific breakthroughs in areas of critical patient needs spanning psychiatry and neurology, oncology, urology, women's health, rare disease, and cell and gene therapies.