The history of the Vapi site dates back to 1990, when Mitsu was established for manufacturing intermediates and agrochemicals. It achieved global prominence for its mastery of chiral chemistry. With in-house R&D, it produced some of the most complex molecules of crop protection chemicals.
In 1999, Mitsu entered into a joint venture with Hoechst Schering AgrEvo. Bilag Industries Pvt. Ltd. was formed with two shareholders, viz. Hoechst Schering AgrEvo GmbH and the Bilakhia Group. In the year 2000, Hoechst Schering AgrEvo GmbH underwent a merger with Rhone Poulenc (inception of Aventis CropScience) and Bilag, which was a part of Aventis CropScience SA.
In 2002, Aventis CropScience was acquired by Bayer, and Bilag became a part of Bayer.
In 2013, Bilag was renamed as Bayer Vapi Private Limited.