Ona Therapeutics is a spin-off from IRB Barcelona and ICREA that develops precision-engineered antibody-drug conjugates (ADCs) to target treatment-resistant cancers. The company uses a proprietary, patient-driven discovery platform to identify tumor-specific antigens and epitopes that enable efficient internalization and targeted payload delivery. Its lead clinical program is ONA-255, initially focused on breast cancer, and it is also advancing ONA-389 targeting colorectal cancer. The company integrates target validation, antibody engineering, optimized payload selection and validated linker-payload technologies in its ADC development approach. Led by CEO Valerie Vanhooren, Ona plans to use the Series B proceeds to advance clinical development of its lead and second programs. The article does not disclose revenue, user metrics or a company valuation.

Total raised

$122M

Funding rounds

3

Latest round

Series B

Latest activity

Jun 2026