ACELYRIN, Inc., a clinical biopharma company, focuses on identifying, acquiring, and accelerating the development and commercialization of transformative medicines. The company's lead product candidate is izokibep, a small protein therapeutic designed to inhibit IL-17A with high potency, which is in Phase 3 clinical trials for use in the treatment of Hidradenitis Suppurativa, Psoriatic Arthritis, and uveitis, as well as in Phase 2 clinical trials for use in the treatment of Axial Spondyloarthritis. It is also developing lonigutamab, a humanized immunoglobulin G1 (IgG1) monoclonal antibody against insulin-like growth factor 1 receptor, which is in Phase 1 clinical trials for use in the treatment of thyroid eye disease; and SLRN-517, a fully human IgG1 monoclonal antibody targeting c-KIT, which is in preclinical stage for use in the treatment of chronic urticaria. The company was incorporated in 2020 and is headquartered in Agoura Hills, California.