Monsanto Co. (MON 49.71, +0.91, +1.87%) said Wednesday its fourth-quarter loss narrowed to $143 million, or 26 cents a share, from $233 million, or 43 cents a share, in the year-ago period. The seed maker swung to an operating loss of 9 cents a share from an operating profit of 2 cents a share. Revenue rose to $2 billion from $1.9 billion. Wall Street analysts expected Monsanto to lose 5 cents a share on revenue of $1.83 billion, according to a survey by FactSet Research. Monsanto said it expects 2011 operating earnings of $2.72 a share to $2.82 a share, compared to the Wall Street target of $2.87 a share.