J&J buys Firefly Bio to strengthen oncology pipeline

8 June 2026

US pharma major Johnson & Johnson (NYSE: JNJ) has agreed to acquire privately-held Firefly Bio for $1 billion in cash, adding a degrader antibody conjugate (DAC) platform designed to target hard-to-treat solid tumors.

The deal gives J&J access to Firefly’s proprietary Firelink platform, which combines features of antibody-drug conjugates (ADCs) and targeted protein degradation. The approach is designed to deliver protein degraders selectively to tumor cells while limiting exposure to healthy tissue.

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