Gilead Sciences Acquires Forty Seven for $4.9 Billion

Gilead Sciences Acquires Immunomedics

September 13, 2020

Biotechnology

Gilead Sciences agreed to acquire Immunomedics for $88.00 per share in an all-cash transaction valuing Immunomedics at approximately $21 billion. The acquisition gives Gilead global rights (outside certain Asian territories) to Trodelvy, an FDA‑approved antibody‑drug conjugate for metastatic triple‑negative breast cancer, and accelerates Gilead’s expansion into oncology.

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.

GSK to Acquire Sierra Oncology for $1.9 Billion

April 13, 2022

Biotechnology

GlaxoSmithKline plc (GSK) has entered into an agreement to acquire late-stage biopharmaceutical company Sierra Oncology, Inc. for $1.9 billion (approximately $55 per share in cash). The acquisition is intended to bring Sierra’s lead asset momelotinib—an investigational targeted therapy for myelofibrosis and anemia—into GSK’s specialty medicines portfolio.

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.

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 To Acquire Arcellx for $7.8 Billion to Strengthen CAR T-Cell Portfolio

February 21, 2026

Biotechnology

Gilead Sciences entered into a definitive agreement to acquire Arcellx, Inc. for $115 per share in cash plus a contingent value right of $5 per share, implying an equity value of about $7.8 billion. The deal is designed to give Gilead full control of Arcellx’s anito-cel (anito-cabtagene autoleucel) BCMA-directed CAR T therapy, eliminating profit-sharing and related payments while accelerating development and commercialization.