Aktis Oncology, a biotechnology company discovering and developing novel classes of targeted alpha radiopharmaceuticals to treat a broad range of solid tumors, today announced it has raised a Series A Extension financing of $84 million, bringing the total capital raised to date to $161 million. The extension included participation from new premier healthcare investors Cowen Healthcare Investments, MRL Ventures Fund, the therapeutics-focused corporate venture fund of Merck & Co., Inc., ArrowMark Partners, Mirae Asset Venture Investment, Timefolio Capital (formerly known as NS Investment), Pappas Capital, and other undisclosed participants. All existing investors MPM Capital, Vida Ventures, EcoR1 Capital, Octagon Capital, TCG Crossover, Bristol Myers Squibb, and Novartis participated in the financing.

Aktis Oncology is a biotechnology company pioneering the discovery and development of a new class of targeted alpha radiopharmaceuticals to treat a broad range of solid tumor cancers. Founded and incubated by MPM Capital, the company has developed proprietary platforms to generate tumor targeting agents with ideal properties for alpha radiotherapy. Designed for high tumor penetration and long residence time, Aktis Oncology's molecules will quickly clear other areas of the body, thereby maximizing tumor elimination while minimizing side effects of treatment. This approach would enable clinicians to visualize and verify target engagement prior to exposure to therapeutic radioisotopes.