Johnson & Johnson Completes Ambrx Acquisition

NEW BRUNSWICK, N.J.–(BUSINESS WIRE)–Johnson & Johnson (NYSE: JNJ) announced today it has successfully completed the acquisition of Ambrx Biopharma, Inc., a clinical-stage biopharmaceutical company with a proprietary synthetic biology technology platform to design and develop next-generation antibody drug conjugates (ADCs), in an all-cash merger transaction for a total equity value of approximately $2.0 billion, or $1.9 billion net of estimated cash acquired, as announced on January 8, 2024. The transaction will be accounted for as a business combination. 

“We’re pleased to welcome Ambrx’s talented scientific team and proprietary ADC platform to Johnson & Johnson. We look forward to continuing the development of ARX517, which represents a potential first- and best-in-class PSMA-targeting ADC for the treatment of metastatic castration-resistant prostate cancer,” said Yusri Elsayed, MD, MHSc, PhD, Global Therapeutic Area Head, Oncology, Johnson & Johnson Innovative Medicine. “This significant opportunity sets the stage for advancing next generation ADCs with the aim of delivering differentiated solid tumor therapies that improve patients’ lives.”

The acquisition presents a distinct opportunity for Johnson & Johnson to design, develop and commercialize targeted oncology therapeutics. Ambrx’s proprietary ADC technology incorporates the advantages of highly specific targeting monoclonal antibodies securely linked to a potent chemotherapeutic payload to achieve targeted and efficient elimination of cancer cells without the prevalent side effects typically associated with chemotherapy.

“The Ambrx team has developed a promising pipeline and ADC platform that will be a strong complement and strategic fit to our oncology innovation strategy,” said Biljana Naumovic, Worldwide Vice President, Oncology, Johnson & Johnson Innovative Medicine. “ADCs are transforming the solid tumor treatment paradigm by leveraging antibody-antigen interactions to release cytotoxic payload directly to tumor cells. This acquisition underscores our ambition to deliver enhanced, precision biologics to transform the treatment of cancers, including prostate cancer.”

About Johnson & Johnson

At Johnson & Johnson, we believe health is everything. Our strength in healthcare innovation empowers us to build a world where complex diseases are prevented, treated, and cured, where treatments are smarter and less invasive, and solutions are personal. Through our expertise in Innovative Medicine and MedTech, we are uniquely positioned to innovate across the full spectrum of healthcare solutions today to deliver the breakthroughs of tomorrow, and profoundly impact health for humanity. Learn more at or at Follow us at @JNJInnovMed.