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 *
Isaacson Mark J.
   2. Issuer Name and Ticker or Trading Symbol
MOSAIC CO [MOS] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP, Gen. Counsel & Corp. Sec.
(Last)
(First)
(Middle)
C/O THE MOSAIC COMPANY, 3033 CAMPUS DRIVE, SUITE E490		 3. Date of Earliest Transaction (Month/Day/Year)
03/08/2018
(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               14,524 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
Deferred Performance Unit (1) (2)               (3)   (3) Common Stock 660   660 D  
Stock Option (Right to Buy) $ 127.21               (4) 07/31/2018 Common Stock 1,152   1,152 D  
Stock Option (Right to Buy) $ 52.72               (4) 07/27/2019 Common Stock 2,246   2,246 D  
Stock Option (Right to Buy) $ 44.93               (4) 07/27/2020 Common Stock 2,598   2,598 D  
Stock Option (Right to Buy) $ 70.62               (4) 07/21/2021 Common Stock 1,480   1,480 D  
Stock Option (Right to Buy) $ 50.43               (4) 03/05/2025 Common Stock 7,461   7,461 D  
Stock Option (Right to Buy) $ 28.49               (5) 03/03/2026 Common Stock 19,912   19,912 D  
Stock Option (Right to Buy) $ 30.42               (6) 03/02/2027 Common Stock 20,182   20,182 D  
Restricted Stock Units $ 0 (7) 03/08/2018   A   9,772   03/08/2021   (8) Common Stock 9,772 $ 0 9,772 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Isaacson Mark J.
C/O THE MOSAIC COMPANY
3033 CAMPUS DRIVE, SUITE E490
PLYMOUTH, MN 55441		       SVP, Gen. Counsel & Corp. Sec.  

Signatures

 /s/ Mark J. Isaacson   03/12/2018
**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 Deferred Performance Units were previously referred to by the reporting person as "Phantom Stock."
(2) Each deferred performance unit represents a right to receive one share of common stock.
(3) The deferred performance units were deferred by the reporting person pursuant to the issuer's LTI Deferral Plan upon the vesting of a performance unit award granted to reporting person on March 5, 2015, and becomes payable in five equal installments commencing on January 30, 2023, and continuing on each anniversary thereafter.
(4) This Stock Option is 100% exercisable.
(5) Grant Date 03/03/2016; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.
(6) Grant Date 03/02/2017; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.
(7) One-for-One
(8) Not Applicable

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