On September 21, 2020, upon recommendation of the Nominating and Corporate Governance Committee of the Board of Directors (the "Board") of Exagen Inc. and pursuant to the bylaws of the Company, the Board approved an increase in its authorized size from eight members to nine members and appointed Wendy Johnson to fill the vacancy created by such increase and serve as a Class III director, with an initial term expiring at the Company's 2022 annual meeting of stockholders. The increase and appointment will be effective as of October 1, 2020. In connection with her appointment to the Board, Ms. Johnson was also appointed to the Audit Committee of the Board, effective as of October 1, 2020. Following Ms. Johnson's appointment, the Audit Committee will consist of Jeff Elliott, Wendy Johnson and Tina S. Nova, Ph.D. Wendy Johnson is currently the Chief Operating Officer of Reneo Pharmaceuticals where she is responsible for day-to-day operations, and was instrumental in setting up the company’s UK corporate entity. Ms. Johnson was previously the Interim Chief Operating Officer of AmpliPhi Biosciences Corporation from September 2014 to January 2017, and a member of its board of directors from May 2014 until its merger with C3J Therapeutics (Armata Pharmaceuticals) in May 2019. From 2005 to January 2014, Ms. Johnson served as a venture partner at ProQuest Investments, a venture capital firm. From 2006 to January 2014, Ms. Johnson served as the President and Chief Executive Officer of Aires Pharmaceuticals, a ProQuest portfolio company, until its sale to MAST Therapeutics in 2014.