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Mosaic ( MOS) is a major producer of phosphate and potash, two of the three primary crop nutrients, with a $23 billion market value.

Auer said 80% of the company had been owned by a Cargill family trust, and when a key family member died, the trustees decided to start selling shares quickly and the price plunged, qualifying it for the Auer fund.

"The fundamentals have been fantastic and look to continue to be fantastic," said Auer, as analysts estimate earnings growth of about 38% next year, to $5.54 per share. It has a forward P/E of 8.3. The company recently announced a $1.2 billion buyback program.

JP Morgan (JPM) lowered its stock-investment rating on Mosaic today to "neutral" from "overweight" and cut its 2012 earnings-per-share forecast to reflect lower estimates for phosphate prices and potash volumes.

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