Annexon, Inc. is a clinical-stage biopharmaceutical company that discovers and develops medicines for inflammatory-related diseases. Its lead candidate, Tanruprubart, is an investigational full-length monoclonal antibody being evaluated in a Phase 3 trial for Guillain-Barré syndrome, has completed a Phase 2 trial for Huntington's disease, and is in a Phase 2a trial for amyotrophic lateral sclerosis. The company is also developing ANX007, an antigen-binding fragment (Fab) in a Phase 3 program for geographic atrophy, and ANX1502, an oral small molecule inhibitor in Phase 1 trials for autoimmune indications. Additionally, it is developing ANX009, a C1q-blocking Fab in a Phase 1 trial for lupus nephritis. Annexon was incorporated in 2011 and is headquartered in Brisbane, California.