Equillium, Inc.

Bus iness. Overview We are a biotechnology innovator developing novel therapies to treat severe autoimmune and inflammatory disorders with the mission to develop life-changing therapeutics for patients. Our primary goal is to advance EQ504, a novel aryl hydrocarbon receptor, or AhR, modulator, into and through clinical development. EQ504 is a preclinical-stage, novel AhR modulator that in multiple translational models has been shown to have a therapeutically beneficial impact inducing anti-inflammatory cells and cytokines while reducing proinflammatory cells and cytokines and improving intestinal tissue barrier function and repair. We initially intend to develop EQ504 for the treatment of ulcerative colitis, or UC, and other gastrointestinal, or GI, diseases with potential indication expansion opportunities for the treatment of inflammatory lung diseases. EQ302 is a preclinical-stage, first-in-class, selective, bi-specific inhibitor of IL-15 and IL-21 formulated for oral delivery. Inhibiting IL-15 and IL-21 is believed to be an effective treatment approach for certain GI indications, including celiac disease. We have conducted preclinical development of EQ302, including in vivo pharmacology studies and formulation development, to further characterize and optimize the product candidate. We are evaluating further advancement of EQ302, including product manufacturing and toxicology studies capable of supporting a potential investigational new drug, or IND, filing and a first-in-human clinical study.