Merck Acquires Pandion Therapeutics

Merck Acquires Prometheus Biosciences for $10.8 Billion

June 16, 2023

Biotechnology

Merck has agreed to acquire clinical-stage biotechnology company Prometheus Biosciences for $200.00 per share in cash, representing an approximate total equity value of $10.8 billion. The acquisition strengthens Merck's immunology pipeline by adding Prometheus' precision-medicine platform and lead candidate PRA023 (MK-7240) for inflammatory bowel disease and other immune-mediated conditions.

Merck to Acquire Harpoon Therapeutics for $680M

January 8, 2024

Biotechnology

Merck has agreed to acquire clinical-stage immunotherapy company Harpoon Therapeutics for $23.00 per share in cash, representing an approximate total equity value of $680 million. The acquisition gives Merck access to Harpoon's TriTAC / ProTriTAC platforms and lead candidate HPN328 (a DLL3-targeting T‑cell engager) to enhance its oncology pipeline; the deal is expected to close in the first half of 2024, subject to customary conditions.

Merck Acquires Acceleron Pharma for $11.5 Billion

September 30, 2021

Biotechnology

Merck has entered into a definitive agreement to acquire Acceleron Pharma Inc. for $180 per share in cash, representing an approximate total equity value of $11.5 billion. The acquisition brings Acceleron's late-stage sotatercept program (for pulmonary arterial hypertension) and its REBLOZYL portfolio into Merck's cardiovascular pipeline, subject to tender offer completion and customary regulatory approvals.

Merck & Co. Acquires Cidara Therapeutics

January 8, 2026

Biotechnology

Merck & Co., through subsidiary Merck Sharp & Dohme LLC, completed a cash tender offer to acquire Cidara Therapeutics, Inc. for $221.50 per share, making Cidara a wholly owned subsidiary. The acquisition adds Cidara's long-acting antiviral candidate CD388 to Merck's respiratory portfolio and is being accounted for as an asset acquisition.

Genmab A/S Acquires Merus N.V. via Tender Offer

December 12, 2025

Biotechnology

Genmab A/S, through its wholly owned purchaser Genmab Holding II B.V., completed a tender offer to acquire outstanding common shares of Merus N.V. for $97.00 per share and commenced a subsequent offering period. The acquisition adds Merus' lead late‑stage oncology asset petosemtamab to Genmab's portfolio, expanding its antibody therapeutics pipeline and expected to be accretive to EBITDA by 2029.

Bristol Myers Squibb Acquires Turning Point Therapeutics

June 3, 2022

Biotechnology

Bristol Myers Squibb agreed to acquire clinical-stage precision oncology company Turning Point Therapeutics in an all-cash transaction valuing the company at approximately $4.1 billion ($76.00 per share). The deal adds Turning Point's lead asset, repotrectinib, and its precision oncology pipeline to BMS's oncology franchise and is expected to close in 2022 (tender offer completed and merger subsequently closed).