Pfizer Acquires Arena Pharmaceuticals

Merck to Acquire Verona Pharma for Approximately $10 Billion

July 9, 2025

Pharmaceuticals

Merck, through a subsidiary, entered into a definitive agreement to acquire Verona Pharma in a transaction valued at approximately $10 billion (at $107 per ADS). The acquisition is intended to add Ohtuvayre (ensifentrine) to Merck’s cardio-pulmonary pipeline, following FDA approval for COPD in June 2024.

Pfizer Acquires Seagen for $43 Billion

December 14, 2023

Biotechnology

Pfizer completed its acquisition of Seagen, acquiring all outstanding common stock of Seagen for $229 per share in cash, valuing the enterprise at approximately $43 billion. The combination is intended to strengthen Pfizer’s oncology portfolio by adding Seagen’s proprietary antibody-drug conjugate (ADC) technology and in-line medicines.

Sun Pharmaceutical Industries Acquires Concert Pharmaceuticals

January 19, 2023

Biotechnology

Sun Pharmaceutical Industries Limited agreed to acquire all outstanding shares of Concert Pharmaceuticals, Inc. via a tender offer for $8.00 per share (approximately $576 million equity value) plus a non-tradeable contingent value right (CVR) of up to $3.50 per share tied to deuruxolitinib sales milestones. The deal adds Concert's late-stage JAK1/2 inhibitor deuruxolitinib for Alopecia Areata to Sun Pharma's global dermatology franchise; Sun Pharma intends to pursue an NDA submission in H1 2023 and expected close was Q1 2023, subject to tender conditions and regulatory approvals.

Halozyme Acquires Antares Pharma for $960M

April 13, 2022

Pharmaceuticals

Halozyme Therapeutics will acquire Antares Pharma for $5.60 per share in cash, valuing Antares at approximately $960 million. The deal, approved unanimously by both boards, is intended to expand Halozyme's drug delivery capabilities by adding Antares' auto-injector platform and commercial specialty products and is expected to be accretive to Halozyme's 2022 revenue and non-GAAP earnings.

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.

Merck Acquires Pandion Therapeutics

February 25, 2021

Biotechnology

Merck will acquire Pandion Therapeutics for $60 per share in cash, representing an approximate total equity value of $1.85 billion, via a tender offer and subsequent merger. Pandion is a clinical-stage biotechnology company focused on precision immune modulators (TALON platform) with lead candidate PT101 targeting regulatory T cells for autoimmune diseases; the transaction is expected to close in the first half of 2021 subject to customary conditions.