XERS 2021 Annual Report

PART I ITEM 1. BUSINESS Overview We are a biopharmaceutical company committed to developing and commercializing innovative solutions to enhance the lives of people with life-threatening diseases. Our primary focus is on therapies for patient populations in endocrinology, neurology, and gastroenterology. We currently have three commercially available products, Gvoke, a ready-to-use liquid glucagon for the treatment of severe hypoglycemia, Keveyis, the first and only U.S. Food and Drug Administration (“FDA”) approved therapy for primary periodic paralysis (“PPP”) and Recorlev, approved by the FDA in December 2021 for the treatment of endogenous hypercortisolemia in adult patients with Cushing’s Syndrome. We also have a pipeline of development programs to extend our current marketed products into new indications and uses or bring new products forward using our proprietary formulation technology platforms, XeriSolTM and XeriJectTM. Commercial Products Our number one priority is maximizing the commercial potential of our three commercial products: Gvoke, Keveyis and Recorlev. • Gvoke (Gvoke HypoPen, Gvoke PFS, Gvoke Kit) is the first ready-to-use liquid stable glucagon for severe hypoglycemia. The product is indicated for use in pediatric and adult patients with diabetes age 2 years and above and can be administered in 2 simple steps. The estimated total addressable market for this therapy is approximately $4.0 billion in the United States. Throughout this document, unless otherwise noted, references to Gvoke include Gvoke PFS, Gvoke HypoPen, Gvoke Kit and Ogluo. • Keveyis is the first and only therapy approved in the United States to treat hyperkalemic, hypokalemic, and related variants of PPP. PPP is a rare genetic, neuromuscular disorder that can cause extreme muscle weakness and/or paralysis; some forms are also commonly associated with myotonia or muscle stiffness. The estimated total addressable market for this therapy is greater than $0.5 billion in the United States. • Recorlev is a cortisol synthesis inhibitor proved for the treatment of endogenous hypercortisolemia in adult patients with Cushing’s syndrome for whom surgery is not an option or has not been curative. Endogenous Cushing’s syndrome is a rare but serious and potentially fatal endocrine disease caused by chronic elevated cortisol exposure. The estimated total addressable market for this therapy is approximately $2.0 billion in the United States. Recorlev was approved by FDA on December 30, 2021 and launched in the United States in January 2022. Our pipeline The following table summarizes key information about our internal products and product candidates. † Orphan Drug Designation *Through Tetris Pharma 6

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