Gilead Sciences Acquires Immunomedics

Gilead Sciences to Acquire Tubulis (Up to $5.0B) to Expand ADC Oncology Pipeline

April 7, 2026

Biotechnology

Gilead Sciences entered into a definitive agreement to acquire Tubulis, a Munich-based clinical-stage biotechnology company developing next-generation antibody-drug conjugates (ADCs), for $3.15 billion upfront in cash plus up to $1.85 billion in contingent milestone payments. Following completion, Tubulis will operate as a dedicated ADC research organization within Gilead, with the Munich site serving as a hub for ADC innovation.

Gilead Sciences Acquires CymaBay Therapeutics for $4.3 Billion

February 12, 2024

Pharmaceuticals

Gilead Sciences, Inc. agreed to acquire CymaBay Therapeutics, Inc. for an equity value of approximately $4.3 billion, or $32.50 per share in cash. The acquisition adds CymaBay’s investigational lead asset seladelpar for the treatment of primary biliary cholangitis (PBC), complementing Gilead’s existing liver portfolio.

AbbVie to Acquire ImmunoGen for $10.1 Billion

November 30, 2023

Pharmaceuticals

AbbVie entered into a definitive agreement to acquire ImmunoGen, including its flagship ADC therapy ELAHERE (mirvetuximab soravtansine-gynx), in a deal valued at approximately $10.1 billion. The transaction is expected to close in mid-2024, subject to ImmunoGen shareholder approval, regulatory approvals, and other customary closing conditions.

Gilead Sciences Acquires MiroBio

September 20, 2022

Biotechnology

Gilead Sciences completed the acquisition of U.K.-based biotechnology company MiroBio for approximately $405 million in cash. The deal gives Gilead MiroBio's discovery platform and portfolio of immune inhibitory receptor agonists, including lead investigational antibody MB272, which is in Phase 1 clinical trials.

Merck Acquires OncoImmune

November 23, 2020

Biotechnology

Merck will acquire all outstanding shares of clinical-stage biopharmaceutical OncoImmune for $425 million upfront in cash, with additional sales-based and regulatory milestone payments possible. The deal centers on accelerating development of OncoImmune’s CD24Fc for severe and critical COVID-19; non-CD24Fc assets will be spun out into a new company in which Merck will invest $50 million for a minority stake.

Gilead Sciences Acquires Forty Seven for $4.9 Billion

March 2, 2020

Biotechnology

Gilead Sciences agreed to acquire clinical-stage immuno-oncology company Forty Seven for $95.50 per share in cash, valuing the deal at approximately $4.9 billion. The acquisition adds Forty Seven's lead investigational antibody magrolimab to Gilead's oncology pipeline and is expected to close in Q2 2020 subject to customary approvals.