 SEATTLE, WA ACCESSWIRE June 29, 2021 Aptevo Therapeutics Inc. Aptevo NASDAQ:APVO, a clinical-stage biotechnology company focused on developing novel immuno-oncology therapeutics based on its proprietary ADAPTIRTM and ADAPTIR-FLEXTM platform technologies today announced that the company has been added to the Russell Microcap Index at the conclusion of the 2021 annual reconstitution. Aptevos inclusion in the index became effective after the US market opened yesterday, June 28, 2021. 