As for Syngenta 500, it is actually a global top 500 chemical enterprise (so there is no one in the global top 500).
Additional information:
1999 Novartis of Switzerland and AstraZeneca of Britain and Sweden respectively merged their agrochemical businesses to form a new company, which is the third largest seed company in the world, with seed sales of 958 million US dollars in 2000, and its main seed business is vegetable seeds.