The encyclopedia · Legal & Compliance · Strategic decision · 2018
Bayer bought Monsanto for $63B — and inherited $10B+ in Roundup cancer lawsuits
Bayer acquired Monsanto in 2018 for $63B. Within a year, juries awarded billions to plaintiffs who said Roundup caused their cancer. Bayer's stock fell 40%.
Bayer · Monsanto · 2018-06
What happened
In June 2018, Bayer, the German pharmaceutical and chemical company, completed its acquisition of Monsanto, the US agricultural biotechnology company, for approximately $63 billion. The deal gave Bayer Monsanto's seed and herbicide portfolio, including Roundup (glyphosate), the world's most widely used weedkiller.
Within two months of the acquisition, a California jury awarded $289 million to a groundskeeper who claimed Roundup caused his non-Hodgkin lymphoma. Two more jury verdicts followed, awarding a combined $2 billion. By 2020, Bayer faced over 125,000 Roundup lawsuits and agreed to pay $10.9 billion to settle them.
Bayer's stock fell over 40% from its pre-acquisition level, and the company's market capitalization dropped below the price it had paid for Monsanto. The case became the definitive example of acquisition due diligence failure: Bayer's financial due diligence was thorough, but its litigation risk assessment catastrophically underestimated the liability it was inheriting.
Why it happened
- Bayer acquired Monsanto for $63B without adequately assessing the Roundup litigation risk.
- Within months, juries awarded billions to plaintiffs claiming Roundup caused cancer.
- Bayer faced 125,000+ lawsuits and settled for $10.9B.
- Bayer's stock fell 40%+, and its market cap dropped below the acquisition price.
The lesson
Due diligence that checks the balance sheet but not the courtroom is incomplete. Bayer asked 'what does Monsanto own?' not 'what is Monsanto being sued for?'
Aftermath
Bayer settled for $10.9B and continues to face ongoing litigation. The company's stock has not recovered to its pre-acquisition level. The case is taught in M&A courses as the definitive example of litigation due diligence failure.
Sources
- Monsanto — Wikipedia (Bayer acquisition, Roundup lawsuits)
- Bayer AG press release, 24 June 2020 — Bayer announces agreements to resolve major legacy Monsanto litigation ($10.1–10.9B for Roundup; ~125,000 filed and unfiled claims)
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