ExpreS2ion Biotech Holding AB (publ), through its subsidiary, ExpreS2ion Biotechnologies ApS, researches and develops preventive and therapeutic vaccine products in the Nordics and internationally. The company's lead asset is ES2B-C001, a therapeutic vaccine for breast cancer that targets the human epidermal growth factor receptor 2 receptor. It is also developing ES2B-I002, a cytomegalovirus vaccine candidate to treat infectious diseases. In addition, the company out licenses its ExpreS2 platform to research institutes and pharmaceutical companies. Further, it sells ExpreS2 test kits and reagents for research purposes or diagnostic applications. The company has collaboration agreement with University of Oxford for the development of vaccine for malaria; and Evaxion Biotech A/S for development of cytomegalovirus vaccine, as well as partnership agreement with Copenhagen University to develop vaccine for Influenza. The company operates an online store. ExpreS2ion Biotech Holding AB (publ) was incorporated in 2015 is based in Helsingborg, Sweden.