Merck Acquires Pandion Therapeutics

Merck & Co. (Merck Sharp & Dohme) Acquires Cidara Therapeutics

January 8, 2026

Biotechnology

Merck Sharp & Dohme LLC (Merck & Co., Inc.) completed its cash tender offer and follow-on merger to acquire Cidara Therapeutics, Inc. for $221.50 per share, valuing the deal at about $9.2 billion. The acquisition adds Cidara’s late-stage, long-acting, strain-agnostic influenza antiviral candidate CD388 to Merck’s respiratory pipeline.

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.

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 Prometheus Biosciences

June 16, 2023

Healthcare Services

Merck (MSD outside the United States and Canada) entered into a definitive agreement to acquire Prometheus Biosciences for $200 per share in cash, valuing the equity at approximately $10.8 billion. The acquisition was expected to close in the third quarter of 2023, and Merck later announced completion of the deal, making Prometheus a wholly owned subsidiary.

Merck to Acquire Acceleron Pharma Inc for $11.5B

September 30, 2021

Biotechnology

Merck (through a subsidiary) entered into a definitive agreement to acquire Acceleron Pharma Inc for $180 per share in cash, for an approximate total equity value of $11.5 billion. The transaction will be completed via a tender offer followed by a merger, and is expected to close in the fourth quarter of 2021, subject to conditions including regulatory approvals and tender of at least a majority of outstanding shares.

Catalent Acquires Paragon Bioservices for $1.2 Billion

May 20, 2019

Biotechnology

Catalent, Inc. completed the $1.2 billion acquisition of Paragon Bioservices, Inc., a viral vector development and manufacturing partner for gene therapies, expanding Catalent’s biologics and gene therapy capabilities. Paragon’s Baltimore-area facilities and ~380 employees will join Catalent’s global biologics platform, while Catalent secured financing including incremental term loans and a convertible preferred issuance to Leonard Green & Partners to support the transaction.