RayzeBio, Inc. announced today a $45M Series A financing to advance the development of its broad pipeline of targeted radiopharmaceuticals. Co-lead investors venBio Partners and Versant Ventures were joined by Samsara BioCapital.

RayzeBio is a biotechnology company that aims to improve clinical benefit by efficiently developing innovative tumor-targeted small molecule medicines that harness the power of radioisotopes. With a focus on clinically validated solid tumor targets, RayzeBio is developing novel macrocyclic peptide mimetic binders to deliver potent therapeutic radioisotopes such as Actinium-225, an alpha-emitter. The company is backed by a syndicate of sophisticated healthcare investors and was established in 2020 by co-founders Deborah Charych, Aaron Kantoff, and Aron Knickerbocker.