Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
O'Rourke James Calvin
   2. Issuer Name and Ticker or Trading Symbol
MOSAIC CO [MOS] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President & CEO
(Last)
(First)
(Middle)
C/O THE MOSAIC COMPANY, 3033 CAMPUS DRIVE, SUITE E490		 3. Date of Earliest Transaction (Month/Day/Year)
02/22/2016
(Street)

PLYMOUTH, MN 55441		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 02/22/2016   P   3,000 A $ 24.9756 (1) 3,000 I Reporting Person's Spouse
Common Stock               63,023 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) $ 52.72               (2) 07/27/2019 Common Stock 12,019   12,019 D  
Stock Option (Right to Buy) $ 44.93               (2) 07/27/2020 Common Stock 20,259   20,259 D  
Stock Option (Right to Buy) $ 70.62               (2) 07/21/2021 Common Stock 16,150   16,150 D  
Stock Option (Right to Buy) $ 57.62               (2) 07/19/2022 Common Stock 27,681   27,681 D  
Restricted Stock Units $ 0 (3)             07/18/2016   (4) Common Stock 11,722   11,722 D  
Stock Option (Right to Buy) $ 54.03               (5) 07/18/2023 Common Stock 29,987   29,987 D  
Restricted Stock Units $ 0 (3)             03/07/2017   (4) Common Stock 12,735   12,735 D  
Stock Option (Right to Buy) $ 49.73               (6) 03/07/2024 Common Stock 33,706   33,706 D  
Restricted Stock Units $ 0 (3)             08/05/2018   (4) Common Stock 22,432   22,432 D  
Stock Option (Right to Buy) $ 50.43               (7) 03/05/2025 Common Stock 37,306   37,306 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
O'Rourke James Calvin
C/O THE MOSAIC COMPANY
3033 CAMPUS DRIVE, SUITE E490
PLYMOUTH, MN 55441		   X     President & CEO  

Signatures

 /s/ Mark J. Isaacson, Attorney-in-Fact for James C. O'Rourke   02/24/2016
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $24.9755 to $24.98, inclusive. The reporting person undertakes to provide to The Mosaic Company, any security holder of The Mosaic Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote 1 to this Form 4.
(2) This Stock Option is 100% exercisable.
(3) One-for-One
(4) Not Applicable
(5) Grant Date 07/18/2013; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.
(6) Grant Date 03/07/2014; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.
(7) Grant Date 03/05/2015; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.

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