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Merck to Buy Cidara for $9.2 Billion to Secure Long‑Acting Flu Preventive

The cash offer centers on CD388, a one‑per‑season flu prophylactic in phase 3 with FDA breakthrough status underpinned by BARDA funding.

Overview

  • Merck will pay $221.50 per share in cash, valuing Cidara at about $9.2 billion, a roughly 109% premium to its prior price.
  • Cidara’s stock jumped more than 100% on Nov. 14 following the acquisition announcement.
  • The lead asset, CD388, is in the phase 3 ANCHOR study after mid‑stage data showed roughly 76% protection against influenza.
  • Reporting indicates the deal is expected to close next quarter, with a competing bid viewed as unlikely.
  • Cidara projects the seasonal preventive could reach over 100 million Americans with peak sales around $3.1 billion by 2040 if approved.