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Final Prospectus · 424B4

Aptevo Therapeutics Inc.

APVONASDAQEQUITYCurrent

Final Prospectus

Filed Sep 3, 2026Accepted Sep 3, 2026, 9:00 AM EDTCIK 1671584Accession 0001193125-26-381149
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Company context

We are a clinical-stage, research and development biotechnology company focused on developing novel immunotherapy candidates for the treatment of different forms of cancer. We have developed two versatile and enabling platform technologies for rational design of precision immune modulatory drugs and have two clinical candidates and six preclinical candidates currently in development. Clinical candidate mipletamig is a CD123xCD3 T cell engager currently being clinically evaluated in the RAINIER trial, part one of a Phase 1b/2 program initiated in August 2024 for the treatment of frontline acute myelogenous leukemia (AML) in combination with standard of care venetoclax + azacitidine. Clinical candidate ALG.APV-527 targets 4-1BB (co-stimulatory receptor) and 5T4 (tumor antigen). The compound is designed to reactivate antigen-primed T cells to specifically kill tumor cells and is currently being evaluated for the treatment of multiple solid tumor types.

Current securities

Historical securities (1)

Recent company filings

  1. S-8 filingSep 25, 2026
  2. Other EventsSep 24, 2026
  3. Submission of Matters to a Vote of Security HoldersSep 23, 2026
  4. Other EventsSep 3, 2026
  5. EFFECT filingSep 2, 2026

As-filed source

Primary evidence