FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
STRANGHOENER LAWRENCE W

(Last)(First)(Middle)
C/O THE MOSAIC COMPANY, 3033 CAMPUS DRIVE, SUITE E490

(Street)
PLYMOUTHMN55441

(City)(State)(Zip)
2. Issuer Name and Ticker or Trading Symbol
MOSAIC CO [MOS]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
3. Date of Earliest Transaction (Month/Day/Year)
07/31/2008
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person

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)
CodeVAmount(A) or (D)Price
Common Stock         100 I By Daughter
Common Stock         100 I By Daughter
Common Stock         50 I by Son
Common Stock 08/01/2008 M  21,645 A$ 0 45,821 D  
Common Stock 08/01/2008 F  8,434 D$ 122.69 37,387 D  
Common Stock 08/04/2008 M  32,363 A$ 0 69,750 D  
Common Stock 08/04/2008 F  13,820 D$ 109.29 55,930 D  

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 Security3. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units $ 0 (1)       10/29/2008 (2) Common Stock 23,272   23,272 D  
Stock Option (right to buy) $ 15.04        (3)10/29/2014 Common Stock 52,084   52,084 D  
Restricted Stock Units $ 0 (1) 08/01/2008 M   21,645 08/01/2008 (2) Common Stock 21,645 $ 0 0 D  
Stock Option (right to buy) $ 17.29        (3)08/01/2015 Common Stock 64,935   64,935 D  
Restricted Stock Units $ 0 (1)       08/04/2009 (2) Common Stock 20,373   20,373 D  
Stock Option (right to buy) $ 15.45        (4)08/04/2016 Common Stock 61,120   61,120 D  
Restricted Stock Units $ 0 (1) 08/04/2008 M   32,363 08/04/2007 (2) Common Stock 32,363 $ 0 0 D  
Restricted Stock Units $ 0 (1)       10/06/2009 (2) Common Stock 4,350   4,350 D  
Stock Option (right to buy) $ 40.03        (5)08/02/2017 Common Stock 25,328   25,328 D  
Restricted Stock Units $ 0 (1)       08/02/2010 (2) Common Stock 10,617   10,617 D  
Stock Option (Right to Buy) $ 127.21 07/31/2008 A  7,315   (6)07/31/2018 Common Stock 7,315 $ 0 7,315 D  
Restricted Stock Units $ 0 (1) 07/31/2008 A  3,931  07/31/2011 (2) Common Stock 3,931 $ 0 3,931 D  
Explanation of Responses:
1. One-for-One
2. Not Applicable
3. This Stock Option is 100% exercisable.
4. Grant Date 08/04/2006; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.
5. Grant Date 08/02/2007; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.
6. Grant Date 07/31/2008; option becomes exercisable in three equal installments commencing on the first anniversary of the grant date and on each anniversary thereafter.
s/Richard L. Mack, Attorney-in-Fact for Lawrence W. Stranghoener08/04/2008
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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