Mosaic director exercises 4,873 RSUs, receives new grant

Mosaic Co director Sonya C. Little reported compensation-related equity transactions.

Rhea-AI Filing Summary

Mosaic Co director Sonya C. Little reported compensation-related equity transactions. She exercised 4,873 restricted stock units into 4,873 shares of Common Stock at a stated price of $0.00 per share, bringing her direct Common Stock holdings to 7,286 shares after the transaction.

The 4,873 restricted stock units had vested on the date of Mosaic’s 2026 Annual Meeting of Stockholders. She also received a new grant of 7,273 restricted stock units, which will vest and be paid on the date of the issuer’s 2027 Annual Meeting of Stockholders. These are awards and derivative exercises, not open-market purchases or sales.

Insider Trade Summary

4,873 shares exercised/converted

Exercise 3 txns

Insider Little Sonya C

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	7,273	$0.00	$0.00
Exercise	Restricted Stock Units	4,873	$0.00	$0.00
Exercise	Common Stock	4,873	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 7,273 contracts (Direct); Common Stock — 7,286 shares (Direct)

Footnotes (4)

1. F1. One-for-One
2. F2. The restricted stock units will vest and be paid to the reporting person on the date of the issuer's 2027 Annual Meeting of Stockholders.
3. F3. Not Applicable
4. F4. The restricted stock units vested on the date of the issuer's 2026 Annual Meeting of Stockholders.

Key Figures

Common shares acquired: 4,873 shares Common shares held after: 7,286 shares RSUs exercised: 4,873 units +2 more

5 metrics

Common shares acquired 4,873 shares Shares of Common Stock received from RSU exercise on 2026-05-28

Common shares held after 7,286 shares Direct Common Stock holdings following the reported transactions

RSUs exercised 4,873 units Restricted stock units converted one-for-one into Common Stock

New RSU grant 7,273 units Restricted stock units granted, vesting at 2027 Annual Meeting of Stockholders

Exercise price per share $0.00 per share Stated transaction price for both RSU exercise and grant entries

Key Terms

Restricted Stock Units, derivative exercise/conversion, Grant, award, or other acquisition, Annual Meeting of Stockholders

4 terms

Restricted Stock Units financial

"The restricted stock units will vest and be paid to the reporting person"

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.

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion""

Grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

Annual Meeting of Stockholders financial

"on the date of the issuer's 2027 Annual Meeting of Stockholders"

FAQ

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

What insider transactions did Mosaic (MOS) director Sonya C. Little report?

Sonya C. Little reported exercising 4,873 restricted stock units into Common Stock and receiving a new grant of 7,273 restricted stock units. These are compensation-related equity awards and derivative exercises, not open-market stock purchases or sales by the director.

How many Mosaic (MOS) common shares does Sonya C. Little hold after these transactions?

After exercising vested units, Sonya C. Little directly holds 7,286 shares of Mosaic Common Stock. This figure reflects her position immediately following the 4,873-share derivative exercise reported in the filing, providing context for the size of her equity stake as a director.

What restricted stock unit grant did Sonya C. Little receive from Mosaic (MOS)?

She received a grant of 7,273 restricted stock units, each convertible one-for-one into Mosaic Common Stock. According to the filing, these units will vest and be paid on the date of Mosaic’s 2027 Annual Meeting of Stockholders, subject to the award terms.

When did the Mosaic (MOS) restricted stock units exercised by Sonya C. Little vest?

The 4,873 restricted stock units she exercised vested on the date of Mosaic’s 2026 Annual Meeting of Stockholders. Once vested, those units were converted one-for-one into 4,873 shares of Common Stock at a stated price per share of $0.00.

Were Sonya C. Little’s Mosaic (MOS) transactions open-market buys or sells?

No, the transactions were not open-market trades. The filing describes a derivative exercise converting 4,873 restricted stock units into Common Stock and a grant of 7,273 new restricted stock units, both recorded at a transaction price of $0.00 per unit or share.

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

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Accepted by SEC EDGAR 06/01/2026 - 07:23 PM EDT Learn about SEC filing dates

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^*

Little Sonya C

(Last) (First) (Middle)

C/O THE MOSAIC COMPANY

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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/28/2026

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	05/28/2026		M		4,873	A	$0	7,286	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)	05/28/2026		A		7,273		(2)	(3)	Common Stock	7,273	$0	7,273	D
Restricted Stock Units	$0(1)	05/28/2026		M			4,873	(4)	(3)	Common Stock	4,873	$0	0	D

Explanation of Responses:

1. One-for-One

2. The restricted stock units will vest and be paid to the reporting person on the date of the issuer's 2027 Annual Meeting of Stockholders.

3. Not Applicable

4. The restricted stock units vested on the date of the issuer's 2026 Annual Meeting of Stockholders.

Remarks:

	/s/ Philip E. Bauer, Attorney-in-Fact for Sonya C. Little	06/01/2026
	** 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)