[4] Bayer AG began marketing in the United States soon after the company's inception in Germany.

While the name "aspirin" became synonymous with Bayer for over a quarter of a century, the company's patents and trademarks were seized by the United States Office of Alien Property Custodian in 1917, due to Germany's enemy status in World War I.

In 1954, Bayer AG and Monsanto reached an agreement for establishment of a joint venture that was to be called Mobay.

[6]: 440 In 1964 the United States Department of Justice brought antitrust action against Mobay, resulting in Bayer AG reaching an agreement to purchase Monsanto's share of the company in 1967.

[15] While Bayer denied wrongdoing, it did reach a 2020 settlement of $10 billion to eliminate uncertainty and resolve outstanding claims.

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