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Thermo Fisher to Divest Microbiology Unit to Astorg for $1.075 Billion

Apr 27, 2026 12:16 UTC
TMO
Medium term

Thermo Fisher Scientific has entered a definitive agreement to sell its microbiology business to private equity firm Astorg. The transaction is expected to close in the second half of 2026.

  • Sale price of $1.075 billion including a $50 million seller note
  • Microbiology unit 2025 revenue stood at $645 million
  • Expected EPS dilution of $0.15 in the first full year
  • Closing expected in H2 2026
  • Further guidance to be provided during Q2 earnings call

Thermo Fisher Scientific Inc. (TMO) announced on Monday that it has signed a definitive agreement to sell its microbiology business to Astorg. The transaction is valued at approximately $1.075 billion, comprising a cash payment and a $50 million seller note. The microbiology business, which specializes in culture media solutions and antimicrobial susceptibility testing, is a meaningful component of the company's diagnostic portfolio. According to company data, the unit generated $645 million in revenue during 2025. From a financial perspective, Thermo Fisher expects the divestiture to be dilutive to its adjusted earnings per share by $0.15 in the first full year following the completion of the deal. The company has indicated that more comprehensive details regarding the impact on its 2026 outlook will be shared during the second-quarter earnings call. Market reaction to the news was muted, with Thermo Fisher shares trading 0.15% lower at $469 in pre-market activity on the New York Stock Exchange. The deal is slated to close in the second half of 2026.

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