Mosaic director gains shares from RSU vesting, grant

Mosaic Co director David Thomas Seaton increased his equity stake through compensation-related stock awards.

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Form Type

Rhea-AI Filing Summary

Mosaic Co director David Thomas Seaton increased his equity stake through compensation-related stock awards. On May 28, 2026, 4,873 restricted stock units vested, and he elected to take 35% in cash with the balance settled in shares, resulting in the acquisition of 3,167 shares of common stock. The filing also shows a new grant of 7,273 restricted stock units, which will vest and be paid on the date of Mosaic’s 2027 Annual Meeting of Stockholders. Following these transactions, Seaton directly owns 51,089 shares of common stock and holds 7,273 restricted stock units that remain outstanding.

Insider Trade Summary

4,873 shares exercised/converted

Exercise 3 txns

Insider Seaton David Thomas

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	3,167	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 7,273 contracts (Direct); Common Stock — 51,089 shares (Direct)

Footnotes (5)

F1. The reporting person, pursuant to the terms of the Restricted Stock Unit Agreement under which the award of restricted stock units was made, elected to receive 35% of the restricted stock units in the form of cash with the balance paid in the form of shares of common stock at the time the award was paid.
F2. One-for-One
F3. 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.
F4. Not Applicable
F5. The restricted stock units vested on the date of the issuer's 2026 Annual Meeting of Stockholders.

Key Figures

Common shares acquired: 3,167 shares RSUs vested: 4,873 units New RSU grant: 7,273 units +2 more

5 metrics

Common shares acquired 3,167 shares Shares received from vested restricted stock units on May 28, 2026

RSUs vested 4,873 units Restricted stock units that vested on Mosaic’s 2026 Annual Meeting date

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

Shares owned after 51,089 shares Direct Mosaic common stock holdings following the reported transactions

RSUs outstanding after 7,273 units Restricted stock units remaining, scheduled to vest at the 2027 Annual Meeting

Key Terms

Restricted Stock Units, Exercise or conversion of derivative security, Grant, award, or other acquisition, Annual Meeting of Stockholders, +1 more

5 terms

Restricted Stock Units financial

"The reporting person, pursuant to the terms of the Restricted Stock Unit Agreement under which the award of restricted stock units was made..."

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.

Exercise or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

Annual Meeting of Stockholders financial

"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."

Restricted Stock Unit Agreement financial

"The reporting person, pursuant to the terms of the Restricted Stock Unit Agreement under which the award of restricted stock units was made..."

A restricted stock unit agreement is a written contract between a company and an individual that describes a promise to deliver company shares or cash later, subject to conditions such as time-based vesting or performance targets. Think of it like a timed gift: the recipient only receives the shares if they meet the agreed conditions. Investors care because these agreements create future share issuance, affect potential dilution, corporate expenses and incentives for insiders, and influence when insiders may sell shares.

FAQ

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

What insider transactions did Mosaic (MOS) director David Thomas Seaton report?

David Thomas Seaton reported compensation-related stock transactions, not open-market trades. 4,873 restricted stock units vested into shares and cash, and he received a new grant of 7,273 restricted stock units that will vest at Mosaic’s 2027 Annual Meeting of Stockholders.

How many Mosaic (MOS) shares did David Thomas Seaton acquire in this Form 4?

Seaton acquired 3,167 shares of Mosaic common stock through the vesting of restricted stock units. The award terms allowed him to take 35% of the value in cash, with the remaining portion paid in shares instead of being purchased on the open market.

What new restricted stock unit award did Mosaic (MOS) grant to David Thomas Seaton?

Mosaic granted Seaton 7,273 restricted stock units in this filing. These units represent a one-for-one right to receive Mosaic common shares and will vest and be paid on the date of the company’s 2027 Annual Meeting of Stockholders, subject to the award’s terms.

How many Mosaic (MOS) shares does David Thomas Seaton own after these transactions?

After the reported transactions, Seaton directly owns 51,089 shares of Mosaic common stock. In addition, he holds 7,273 restricted stock units outstanding, which are scheduled to vest and be paid on the date of Mosaic’s 2027 Annual Meeting of Stockholders.

Did David Thomas Seaton sell any Mosaic (MOS) shares in this Form 4 filing?

The filing does not report any open-market sales of Mosaic shares by Seaton. The transactions are classified as exercises or conversions of restricted stock units and a new grant, with a portion of the vested units settled in cash under the award’s terms.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/01/2026 - 07:24 PM EDT

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^*

Seaton David Thomas

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/28/2026		M		3,167⁽¹⁾	A	$0	51,089	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	$0⁽²⁾	05/28/2026		A		7,273		⁽³⁾	⁽⁴⁾	Common Stock	7,273	$0	7,273	D
Restricted Stock Units	$0⁽²⁾	05/28/2026		M			4,873⁽¹⁾	⁽⁵⁾	⁽⁴⁾	Common Stock	4,873	$0	0	D

Explanation of Responses:

1. The reporting person, pursuant to the terms of the Restricted Stock Unit Agreement under which the award of restricted stock units was made, elected to receive 35% of the restricted stock units in the form of cash with the balance paid in the form of shares of common stock at the time the award was paid.

2. One-for-One

3. 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.

4. Not Applicable

5. 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 David T. Seaton	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)

Source: View Original Filing on SEC EDGAR