Ona raises $87 million to move first ADC into human studies

4 June 2026

Spanish biotech Ona Therapeutics has raised $87 million in an oversubscribed series B round, giving the Barcelona company the cash to move its lead antibody-drug conjugate, ONA-255, into human studies.

The financing was co-led by new investors Columbus Venture Partners and Mérieux Equity Partners, with COFIDES and Korys also joining the round. Existing backers Alta Life Sciences, Asabys Partners, Bpifrance, CDTI, FundPlus and Ysios Capital also participated.

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