Monsanto Monsanto The Monsanto Company () was an American agrochemical and agricultural biotechnology corporation that existed from 1901 until 2018 when it was acquired by Bayer. It was headquartered in Creve Coeur, Missouri. Monsanto developed Roundup, a glyphosate-based herbicide in the 1970s, and became a major producer of genetically engineered crops. Monsanto was one of four groups to introduce genes into plants (1983), and was among the first to conduct field trials of genetically modified crops, (1987). It was one of the top 10 U.S. chemical companies until it divested most of its chemical businesses between 1997 and 2002, through a
Monsanto 1919 in a partnership with Graesser's Chemical Works at Cefn Mawr, Wales. The venture produced vanillin, aspirin and its raw ingredient salicylic acid, and later rubber processing chemicals. In the 1920s, Monsanto expanded into basic industrial chemicals such as sulfuric acid and PCBs. Queeny's son Edgar Monsanto Queeny took over the company in 1928. In 1926 the company founded and incorporated a town called Monsanto in Illinois (now known as Sauget). It was formed to provide minimal regulation and low taxes for Monsanto plants at a time when local jurisdictions had most of the responsibility for environmental rules. It was