Ropes & Gray Advised Johnson & Johnson in $1 Billion Firefly Bio Acquisition for KRAS Inhibitor Cancer Treatments

In The News
August 31, 2026

Ropes & Gray advised Johnson & Johnson in an agreement to acquire Firefly Bio and its novel degrader-antibody conjugate (DAC) platform targeted toward KRAS-driven solid tumors for $1 billion in cash to expand its oncology pipeline. The transaction was announced on June 8 and completed on July 29.

The Ropes & Gray team was led by mergers & acquisitions partner Matt Byron and included IP transactions partner David McIntosh, tax partner Amanda Holt, employment, executive compensation & benefits principal Abby Meyer and senior benefits consultant Ben Asch.