Table of Contents As filed with the Securities and Exchange Commission on January 7, 2026. Registration No. 333-292283 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 2 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Copies to: Siavosh Salimi William A. Magioncalda Paul Hastings LLP The MetLife Building 200 Park Avenue New York, New York 10166 (212) 318-6000 Aktis Oncology, Inc. (Exact name of registrant as specified in its charter) Delaware 2834 85- ...

Table of Contents As filed with the Securities and Exchange Commission on January 5, 2026. Registration No. 333-292283 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Aktis Oncology, Inc. (Exact name of registrant as specified in its charter) Delaware 2834 85-2584233 (State or other jurisdiction of Incorporation or organization (Primary Standard Industrial Classification Code Number) (I.R.S. Employer ...

Table of Contents As filed with the Securities and Exchange Commission on December 19, 2025. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Aktis Oncology, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of Incorporation or organization Delaware 2834 85-2584233 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification No.) 17 ...

Core Insights - Molecular Partners AG presented new data on MP0712, a Radio-DARPin targeting DLL3, at the Targeted Radiopharmaceuticals Summit Europe, showcasing promising human imaging results and supporting mechanism of action data [1][2][3] Clinical Development - MP0712 is being developed in collaboration with Orano Med for treating small cell lung cancer (SCLC) and other neuroendocrine cancers, with a Phase 1 trial expected to start by the end of 2025 [1][7] - The Phase 1 Investigational New Drug (IND) application has been filed, and ongoing discussions with the FDA are taking place [7][8] Imaging and Efficacy - Initial imaging results indicate targeted delivery of MP0712 into tumors with minimal exposure to healthy organs, suggesting its potential effectiveness in a clinical setting [2][3] - A case study showed specific uptake in tumor lesions at 24 hours, sustained over four days, with limited accumulation in healthy organs [3][5] Mechanism of Action - MP0712 is engineered for half-life optimization to maintain drug levels in the blood, supporting its intended mechanism of action [3][6] - The data suggests that MP0712 can achieve high tumor uptake even with low DLL3 expression levels, leveraging internalization and optimal binding properties [6] Future Outlook - The company anticipates initial clinical data from the Phase 1/2a study in 2026, which will assess safety and determine a recommended phase 2 dose for MP0712 [7][8] - Molecular Partners is also advancing additional Radio-DARPin programs in 2026 [2][8] Technology and Innovation - The Radio-DARPin platform combines the targeting capabilities of DARPins with the therapeutic potential of 212Pb, aiming to improve the delivery of radioactive payloads to solid tumors [11] - DARPins are designed to offer high specificity and affinity, making them suitable for efficient delivery of therapeutic radionuclides [12]