Phathom Pharmaceuticals, Inc. is a biopharmaceutical company, which focuses on the development and commercialization of novel treatments for gastrointestinal diseases and disorders. It develops Vonoprazan, a potassium-competitive acid blocker. The company was founded by Tadataka Yamada, David Socks, Azmi Nabulsi, Aditya Kohli, and Roger Ulrich on January 9, 2018 and is headquartered in Buffalo Grove, IL.