VelosBio, Inc., a biopharmaceutical company, develops novel antibody-drug conjugates (ADCs) to treat hematological cancers and solid tumors. The company develops cancer therapies targeting receptor tyrosine kinase-like orphan receptor 1 (ROR1). Its portfolio includes VLS-101, a ROR1-directed antibody-drug conjugate for patients with hematologic and solid tumor malignancies. The company was incorporated in 2017 and is headquartered in San Diego, California. As of December 18, 2020, VelosBio, Inc. operates as a subsidiary of Merck & Co., Inc.