Here is a list I found from a quick search, try to guess which country the biggest producers is based in or how many of top 5 you expect to have heard of before opening the link.
https://en.wikipedia.org/wiki/ThyssenKrupp
This just keeps getting more interesting.
I think many people have heard of John Deere and Monsanto but what about McGregor? They may not be as big as AWS but even with Ag experience I bet there are bigger similar organizations.
I bet there are big custom harvest operations too. We had a two man operation on the Palouse but I heard stories about huge operations out of Texas that migrated through the midwest following harvest cycles.