On June 3, 2021, Phathom Pharmaceuticals, Inc. appointed Anthony Guzzo, its Vice President, Chief Accounting Officer, as principal accounting officer and interim principal financial officer for filings under the Securities Act of 1933, as amended (the Securities Act), and the Securities Exchange Act of 1934, as amended (the Exchange Act), effective as of June 4, 2021. Prior to joining the Company in March 2020 as its Controller, Mr. Guzzo served in various roles at Celgene Corporation, starting in 2008, including as Corporate Controller.