Shares of FMC Corp. lost a third of their value Wednesday, making the stock by far the biggest decliner in the S&P 500.

CNBC's Jim Cramer breaks down why he's keeping an eye on shares of FMC Corp.

FMC Corp. is an agricultural sciences company, which engages in the provision of solutions to growers and development of pipeline in crop protection, plant health, agriculture, pest control, and ...