The top ten seed companies have incomes at over $10 billion USD. Monsanto and Dupont/Pioneer lead the way with over 50% of seed sales in the world. All of the top ten companies are located in the U.S.A, Japan or Europe.
From collection: IAASTD - International assessment of agricultural science and technology for development
IAASTD/Ketill Berger, UNEP/GRID-Arendal