Total return: 87%
Fortune 500 rank: 421
America's love affair with ethanol didn't just boost corn growers last year, it also lifted farm machinery maker Agco, which made significant gains over the year. Along with corn prices, wheat and soybean futures rose as well and gave farmers the confidence to spend on equipment. But are they being too presumptuous? To cash in on the ethanol boom, farmers plan to plant the largest acreage of corn in more than 60 years. If a glut happens and prices dive, then that will put pressure on the entire agriculture complex, including equipment makers like Agco.
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