PLYMOUTH, Minn., Dec. 17, 2012 /PRNewswire/ -- The Mosaic Company MOS today announced that its Board of Directors has approved a change in the Company's fiscal year end to December 31 from May 31. Mosaic will complete its current fiscal year on May 31, 2013 and will then begin reporting quarterly results on a calendar-year basis with the quarter ending on September 30, 2013. The Company will report results for a transition period of June 1 to Dec. 31, 2013. The Company's first full calendar reporting year will be 2014.