On April 3, 2024, the board of directors of Alpine Immune Sciences, Inc. appointed U. Martin Fuhs as its Chief Accounting Officer and principal accounting officer. Mr. Fuhs has served as the Company?s Vice President, Finance since November 2021 and will continue to serve the Company in such role. Mr. Fuhs succeeds Paul Rickey, the Company?s Senior Vice President, Chief Financial Officer, and Corporate Secretary, in the role of principal accounting officer.

Mr. Rickey will continue to serve as the Company?s Senior Vice President, Chief Financial Officer, Corporate Secretary, and Treasurer, as well as the Company?s principal financial officer. Prior to joining the Company, Mr. Fuhs, age 56, served as Chief Accounting Officer of Holland America/Princess Cruises Group for Carnival Corporation from May 2018 to January 2021. In total, Mr. Fuhs has almost 30 years of experience in auditing and financial reporting roles, including management positions with KPMG LLP, Public Storage, Inc., Plum Creek Timber Company, Inc. and T-Mobile US, Inc. Mr. Fuhs received his Masters of Economics degree from the University of Bonn in Germany and is a certified public accountant in Washington State.