Rallybio Announces Succession Plan; Appoints Stephen Uden, M.D., as Chief Executive Officer, Effective August 1, 2023

Rallybio Corporation (Nasdaq: RLYB), a clinical-stage biotechnology company committed to identifying and accelerating the development of life-transforming therapies for patients with severe and rare diseases, today announced that Stephen Uden, M.D., Rallybio’s President, Chief Operating Officer and Co-Founder has been appointed to the role of Chief Executive Officer, effective August 1, 2023. Dr. Uden will remain President and will also be appointed to Rallybio’s Board of Directors. The Company does not expect to hire a replacement for Dr. Uden’s current role. He will succeed Martin Mackay, Ph.D., Chief Executive Officer, Chairman of the Board, and Co-Founder, who will assume the role of Executive Chairman. As Executive Chairman, Dr. Mackay will remain a full-time employee and continue to be actively involved with the Company, with a particular focus on company strategy, investor relations and related activities.

“It is a great privilege to lead Rallybio and our experienced and talented team on our mission to establish the Company as a leader in the development of transformative medicines for underserved rare diseases. I am excited to build on our successes, advance our clinical programs, and work tirelessly towards delivering new product candidates from our discovery collaborations. I look forward to continuing my close partnership with Martin in his new role as Executive Chairman, as we, together with our Board of Directors and our employees, continue to execute Rallybio’s mission and strategy,” said Dr. Uden. “Looking ahead to the rest of 2023, we expect results from our multiple dose cohort Phase 1 study of RLYB212, our anti-HPA-1a monoclonal antibody product candidate for the prevention of fetal and neonatal alloimmune thrombocytopenia, in the fourth quarter of 2023. Our multiple ascending dose Phase 1 study of RLYB116, an inhibitor of complement component 5, also continues to progress, and we expect to share initial data from this study, as well as details on our initial indication strategy, in the fourth quarter of 2023.”

“Steve is a gifted leader with a deep commitment to Rallybio’s values and stakeholders. Since the inception of Rallybio, Steve has touched all aspects of Rallybio’s business and has been a leader in setting the company’s direction and overseeing the day-to-day operations,” said Dr. Mackay. “I am truly excited to continue our partnership and share in the future success of Rallybio.”