Consolidation has increased in the international seed industry in recent decades. This chart below depicts changes in ownership involving major seed companies and their subsidiaries, primarily occurring from 1996 to 2008. The largest firms are represented as circles, with size proportional to global commercial seed market share.

For a larger PDF version see: https://www.msu.edu/~howardp/seedindustry.pdf

For an article providing more detail see: Howard, Philip H. 2009. Visualizing Consolidation in the Global Seed Industry: 1996–2008. Sustainability, 1(4), 1266-1287. http://www.mdpi.com/2071-1050/1/4/1266