On December 31, 2018, Jennifer Jarrett, Arcus Biosciences, Inc.'s Chief Financial and Operating Officer, notified the Company of her intent to resign effective January 11, 2019. On January 3, 2019, the Board of Directors of the Company appointed Ms. Jarrett to the Board as a Class III non-employee director effective January 12, 2019. Ms. Jarrett was appointed to a newly created vacancy resulting from an increase in the size of the Board from six (6) to seven (7) directors. In connection with Ms. Jarrett's resignation, Steven Chan, the Company's Vice President of Finance and principal accounting officer, has been appointed principal financial officer effective January 12, 2019. Mr. Chan has served as Vice President, Finance and Corporate Controller since April 2017 and Principal Accounting Officer since December 2017. Before that, from November 2014 to March 2017, he served as the Vice President of Finance and Corporate Controller at MyoKardia, Inc. where he helped lead the company to an initial public offering in 2015.