Mosaic SVP Martus acquires 7,882 stock units

The award vests in three cumulative stages, reaching 100% on November 2, 2029.

Available on EDGAR 11/04/2026 - 04:12 PM EST Accepted by SEC EDGAR 11/04/2026 - 04:11 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Mosaic Co (MOS) SVP - Supply Chain Christopher Edward Martus acquired 7,882 restricted stock units on November 2, 2026. The units are one-for-one with common stock and vest cumulatively: 33% on November 2, 2027, 66% on November 2, 2028, and 100% on November 2, 2029. His reported direct common-stock holdings following the transaction were 21,651 shares.

Insider Trade Summary

Grant/Award: 7,882 shares

Grant/Award 1 txn

Insider Martus Christopher Edward

Role SVP - Supply Chain

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units F1, F2, F3	7,882	$0.00	$0.00
Holding	Restricted Stock Units F1, F3	--	--	--
Holding	Restricted Stock Units F1, F3	--	--	--
Holding	Restricted Stock Units F1, F4, F3	--	--	--
Holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 17,336 contracts for 9,454 underlying shares (Direct); Common Stock — 21,651 shares (Direct)

Holdings Before and After: Restricted Stock Units, 9,454 to 17,336 contracts (Direct)

Footnotes (4)

1. F1. One-for-One
2. F2. The Restricted Stock Unit will vest a cumulative vesting percentage equal to 33% on November 2, 2027, 66% on November 2, 2028 and 100% on November 2, 2029.
3. F3. Not Applicable
4. F4. The Restricted Stock Unit will vest a cumulative vesting percentage equal to 33% on March 4, 2027, 66% on March 4, 2028 and 100% on March 4, 2029.

Key Figures

Restricted stock units acquired: 7,882 units Direct common-stock holdings: 21,651 shares Cumulative vesting: 33% +2 more

5 metrics

Restricted stock units acquired 7,882 units November 2, 2026

Direct common-stock holdings 21,651 shares Following the transaction

Cumulative vesting 33% November 2, 2027

Cumulative vesting 66% November 2, 2028

Cumulative vesting 100% November 2, 2029

Key Terms

Restricted Stock Units, cumulative vesting percentage, One-for-One

3 terms

Restricted Stock Units financial

"The Restricted Stock Unit will vest"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

cumulative vesting percentage technical

"vest a cumulative vesting percentage equal to 33%"

One-for-One technical

"One-for-One"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many RSUs did MOS SVP - Supply Chain Christopher Edward Martus acquire?

Christopher Edward Martus acquired 7,882 restricted stock units on November 2, 2026.

When do Christopher Edward Martus's MOS restricted stock units vest?

The 7,882 restricted stock units vest cumulatively: 33% on November 2, 2027, 66% on November 2, 2028, and 100% on November 2, 2029. The units are one-for-one with common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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SEC Form 4

FORM 4

UNITED 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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Martus Christopher Edward

(Last) (First) (Middle)

101 EAST KENNEDY BLVD

SUITE 2500

(Street)

TAMPA FLORIDA 33602

(City) (State) (Zip)

UNITED STATES

(Country)

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 - Supply Chain

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/02/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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								21,651	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 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 Securities Underlying Derivative Security (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: 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
Restricted Stock Units	$0(1)	11/02/2026		A		7,882		(2)	(3)	Common Stock	7,882	$0	7,882	D
Restricted Stock Units	$0(1)							03/05/2027	(3)	Common Stock	2,669		2,669	D
Restricted Stock Units	$0(1)							03/04/2028	(3)	Common Stock	3,901		3,901	D
Restricted Stock Units	$0(1)							(4)	(3)	Common Stock	2,884		2,884	D

Explanation of Responses:

1. One-for-One

2. The Restricted Stock Unit will vest a cumulative vesting percentage equal to 33% on November 2, 2027, 66% on November 2, 2028 and 100% on November 2, 2029.

3. Not Applicable

4. The Restricted Stock Unit will vest a cumulative vesting percentage equal to 33% on March 4, 2027, 66% on March 4, 2028 and 100% on March 4, 2029.

Remarks:

	/s/ Philip E. Bauer, Attorney-in-Fact for Christopher E. Martus	11/04/2026
	** Signature of Reporting Person	Date
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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)