Aptorum Group Limited, through its subsidiaries, a clinical stage biopharmaceutical company, engages in the discovery, development, and commercialization of therapeutic products to treat oncology and infectious diseases. Its pipeline products include SACT-1, a repurposed drug candidate, which is in phase 1 clinical trial to treat neuroblastoma and other cancer types; ALS-4, a repurposed small molecule, which is in phase 1 clinical trial for the treatment of bacterial infections, such as staphylococcus aureus, mycobacterium tuberculosis, and pseudomonas aeruginosa. The company also develops SACT-COV19, a repurposed small molecule which is in preclinical trial for the treatment of coronavirus disease; SACT-2 and SACT-3; ALS-1, a small molecule which is in preclinical trial to treat bacterial infections caused by staphylococcus aureus, including methicillin-resistant staphylococcus aureus (MRSA); and ALS-2/3, a small molecule which is in preclinical trial for the treatment of gram+ve bacterial infections. The company was formerly known as APTUS Holdings Limited and changed its name to Aptorum Group Limited in October 2017. Aptorum Group Limited was incorporated in 2010 and is headquartered in London, the United Kingdom.