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Merck Nears $9.2 Billion Cidara Purchase at $221.50 a Share

The pursuit centers on CD388, a season-long flu antibody with FDA breakthrough status.

Merck logo is seen in this illustration taken March 26, 2025. REUTERS/Dado Ruvic/Illustration/File Photo

Overview

  • Cidara is reported to have accepted Merck’s all-cash offer of $221.50 per share, with potential milestone payments lifting the value to as much as $9.2 billion.
  • An announcement could come as soon as Friday, according to multiple reports, as both companies declined to comment publicly.
  • Cidara shares jumped nearly 100% in premarket trading to about $208 after the reports, a sharp repricing from a roughly $3.3 billion market value.
  • The deal is driven by CD388, a long-acting antibody in phase 3 that aims to provide season-long protection against influenza A and B for high-risk patients.
  • Mid-stage data showed up to 76% protection with CD388, and Merck’s bid followed competition from at least one other pharmaceutical suitor.