First Tracks Biotherapeutics

First Tracks Biotherapeutics, Inc. engages in the research and development of immunology therapeutics for autoimmune and inflammatory diseases. The company is headquartered in San Diego, California. The company went IPO on 2026-04-06. The firm's clinical-stage pipeline includes Rosnilimab, a selective pathogenic T cell depleter, for the treatment of moderate-to-severe rheumatoid arthritis (RA), ANB033, a CD122 antagonist, for celiac disease (CeD) and eosinophilic esophagitis (EoE), and ANB101, a blood dendritic cell antigen 2 (BDCA2) modulator. Rosnilimab is an IgG1 antibody that directly targets pathogenic T cells, such as activated Tph/Tfh and T effector cells, in the periphery or inflamed tissue. Rosnilimab is designed to selectively deplete pathogenic T cells while sparing non-pathogenic T cells, including naive T cells, to preserve overall immune function and restore immune homeostasis. Its molecules have applicability across a range of autoimmune and inflammatory diseases, including gastroenterology, rheumatology and other areas.