Allakos Announces Additions to Senior Leadership Team

— Board of Directors appoints Robert Alexander as CEO and Adam Tomasi as COO & CFO —

— Allakos plans to initiate a broad, multi-indication clinical program with AK002 in 2017 —

SAN CARLOS, Calif., August 15, 2017 –Allakos Inc., a private, clinical-stage biopharmaceutical company focused on the development of therapeutic antibodies for the treatment of allergic, inflammatory and proliferative diseases, today announced the appointments of two industry veterans to the leadership team. Dr. Robert Alexander, former Chief Executive Officer of ZS Pharma, has been appointed as Chief Executive Officer (CEO) of Allakos and Dr. Adam Tomasi, former Chief Scientific Officer and Head of Corporate Development at ZS Pharma, has been appointed as Chief Operating Officer (COO) and Chief Financial Officer (CFO) of Allakos.