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 September 2016, Bayer announced its intent to acquire Monsanto for US$66 billion. After gaining US and EU regulatory approval, the sale was completed on June 7, 2018. In 1901 Monsanto was founded in St. Louis, Missouri, as a chemical company. The founder was John Francis Queeny, a 30‑year veteran of the nascent pharmaceutical industry. He funded the firm with his own money and capital from a soft drink distributor. He used his wife's maiden name for the company. The company's first products were commodity food additives, such as the artificial sweetener saccharin, caffeine and vanillin. Monsanto expanded to Europe in