Seedy Industry Structure: 1996-2008

From Philip H. Howard at Michigan State:

Consolidation has increased in the international seed industry in recent decades. The 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.

(click image to view zoom.it version)

Extra Credit: Count how many sound like food companies.