On October 28, 2021, the Board of Directors of Adaptive Biotechnologies Corporation designated Kyle Piskel as the Company's principal accounting officer. Mr. Piskel will assume the principal accounting officer duties from Chad Cohen and Mr. Cohen will retain his duties as Chief Financial Officer and principal financial officer. Mr. Piskel, 38, has served in various roles with increasing levels of responsibility, including Corporate Controller, since joining the Company in September 2015. Prior to joining the Company, Mr. Piskel was an Accounting Manager at Expedia Group from October 2014 to August 2015.