Monsanto is the largest seed company in the world. It controls 95 percent of the market for insect and herbicide resistant cotton traits. In 2008, Monsanto had shares of up to 65 percent for traited corn and soybeans and about 45 percent for traited corn. During the late 1990s and through the 2000s, Monsanto acquired almost 40 companies “creating the horizontal and vertical integration that underlies the firm’s platforms in cotton, corn, and soybeans,” according to a whitepaper by American Antitrust Institute’s vice president and senior fellow, Diana Moss. Most of the acquisitions were seed companies.
http://www.triplepundit.com/2009/11/the-monopoly-named-monsanto/