We are a clinical-stage biotechnology company built around a team of seasoned industry experts with a shared purpose and a track record of success in discovering, developing, manufacturing and delivering therapies that meaningfully improve the lives of patients suffering from severe and rare diseases. Our mission at Rallybio is aligned with our expertise, and we believe we have assembled the best people, partners and science to forge new paths to life-changing therapies. Since our launch in January 2018, we have acquired a portfolio of promising product candidates that consists of five programs, and we are focused on further expanding our portfolio with the goal of making a profound impact on the lives of even more patients. We are drawing on our decades of knowledge and experience with a determination to tackle the undone, the too difficult, the inaccessible – and change the odds for rare disease patients.

Our most advanced program is for the prevention of fetal and neonatal alloimmune thrombocytopenia, or FNAIT, a potentially life-threatening rare hematological disease that impacts fetuses and newborns. We are evaluating RLYB211, a polyclonal anti-HPA-1a antibody, in a Phase 1/2 clinical trial, which we believe has established proof of concept for RLYB211 and provides support for our proposed mechanism of action. We plan to move our FNAIT program forward with our lead product candidate, RLYB212, a monoclonal anti-HPA-1a antibody. We submitted a clinical trial application, or CTA, for RLYB212 in July 2021, and subject to the acceptance of our CTA submission, we expect to initiate a Phase 1 first-in-human trial in Germany in the first quarter of 2022.

We are also focused on developing therapies that address diseases of complement dysregulation, including paroxysmal nocturnal hemoglobinuria, or PNH, generalized myasthenia gravis, or gMG, and ophthalmic disorders. RLYB116 is a novel, potentially long-acting, subcutaneously administered inhibitor of complement factor 5, or C5, in development for the treatment of patients with PNH and gMG. We expect to submit a CTA for RLYB116 in the fourth quarter of 2021 to support the initiation of a Phase 1 trial in healthy participants.

RLYB114 is a pegylated C5 inhibitor in preclinical development for the treatment of complement-mediated ophthalmic diseases, and we expect to submit a CTA for this product candidate in the first half of 2023. Additionally, in collaboration with Exscientia Limited, or Exscientia, we have two discovery-stage programs focused on the identification of small molecule therapeutics for patients with rare metabolic diseases.

(Note: Rallybio priced its IPO on July 28, 2021, at $13 – the low end of its $13-to-$15 range – on more shares – 6.2 million shares, up from 5.75 million in the prospectus – to raise $80.6 million.)