MOSAIC CO — Director's Dealing 2010

Mar 3, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MOSAIC CO (MOS)
CIK: 0001285785
Period of Report: 2010-03-01

Reporting Person: MATHIS DAVID B (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-03-01	Common Stock	M	2500	$14.6563	Acquired	34646	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-03-01	Stock Option (right to buy)	$14.6563	M	2500	Disposed	2010-04-25	Common Stock (2500)	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (right to buy)	$12.1500	2012-05-10	Common Stock (9800)	9800	Direct
Stock Option (right to buy)	$11.5900	2014-05-14	Common Stock (7800)	7800	Direct
Restricted Stock Units	$0.00		Common Stock (1624)	1624	Direct
Restricted Stock Units	$0.00		Common Stock (2327)	2327	Direct
Restricted Stock Units	$0.00		Common Stock (1712)	1712	Direct

Footnotes

F1: One for one

F2: Not applicable

F3: The restricted stock units vested on October 9, 2009. Vested shares will be delivered to the reporting person on October 9, 2011.

F4: The restricted stock units vest on October 8, 2010. Vested shares will be delivered to the reporting person on October 8, 2012.