Pfizer Acquires Arena Pharmaceuticals

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.

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.

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.

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.