Effective June 12, 2020, the Board of Directors of Guardant Health, Inc. increased the number of directors on the Board to seven and appointed Vijaya Gadde as a Class I director of the Company. Ms. Gadde will serve on the Board for a term expiring at the 2022 Annual Meeting of Stockholders and until her successor is duly elected and qualified, or until her earlier death, resignation or removal. In connection with her appointment to the Board, Ms. Gadde was also appointed to the compensation committee of the Board. Ms. Gadde has served as the Chief Legal Officer of Twitter, Inc. since February 2018 and Secretary since August 2013, its General Counsel from August 2013 to February 2018, its head of communications from July 2015 to August 2016 and as its Director, Legal from July 2011 to August 2013. Ms. Gadde serves on the Board of Trustees of NYU Law School and the Board of Directors of Mercy Corps, a global humanitarian aid and development organization, which partners with communities, corporations and governments.