Wheat is turned into flour, which is used in a wide range of foods including bread, noodles, pasta, biscuits, cakes, sauces and hundreds more – so it's pretty vital to the global food chain. Despite this, only a handful of companies control the majority of wheat and grain production and processing – and many are privately owned. We've pulled together the biggest US-listed companies operating in the wheat and milling industry, each with a minimum market cap of $1bn. But don't rely on us. You'll need to do your own research and don't take this for advice.