Annexon, Inc. is a clinical-stage biopharmaceutical company, which develops a pipeline of novel therapies for patients with classical complement-mediated disorders of the body, eye and brain. The company is headquartered in Brisbane California, California and currently employs 99 full-time employees. The company went IPO on 2020-07-24. The company identifies and characterizes the role of the classical complement pathway in three therapeutic areas: autoimmune, neurodegeneration and ophthalmology, using its proprietary platform. Its lead candidate, ANX005, an investigational, full-length monoclonal antibody (mAb), is formulated for intravenous administration as the potential first targeted treatment for patients with Guillain-Barre Syndrome (GBS). The company is advancing ANX1502, a novel small-molecule inhibitor of classical complement designed for oral administration in a range of chronic autoimmune diseases. The company is also advancing ANX007, designed to block C1q locally in the eye, to provide complete protection against excess classical complement activity and the loss of photoreceptor neurons.