[Form 4] COMPASS MINERALS INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

Compass Minerals International (CMP) reported insider equity activity by its President and CEO (also a director) on 10/15/2025. 45,467 restricted stock units converted into common stock (transaction code M) at $0, and 15,189 shares were withheld at $19.53 to satisfy taxes (code F). Following these transactions, the insider directly beneficially owns 50,789 common shares.

The filing also shows 90,933 restricted stock units beneficially owned after the event, vesting in three equal annual installments from October 15, 2025 to October 15, 2027, and 4,882 deferred stock units related to director service.

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

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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).

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^*

DOWLING EDWARD C

(Last) (First) (Middle)

C/O COMPASS MINERALS INTERNATIONAL, INC.

9900 WEST 109TH STREET, SUITE 100

(Street)

OVERLAND PARK KS 66210

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
COMPASS MINERALS INTERNATIONAL INC [ CMP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2025

4. If Amendment, Date of 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

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	10/15/2025		M		45,467	A	$0	65,978	D
Common Stock	10/15/2025		F		15,189(1)	D	$19.53	50,789	D
Common Stock(2)								4,882	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 Unit	(3)	10/15/2025		M			45,467	(4)	10/15/2027	Common Stock	45,467	$0	90,933	D

Explanation of Responses:

1. Represents the number of shares withheld to satisfy tax withholding obligations in connection with the vesting and release of the restricted stock units listed in Table II.

2. Represents deferred stock units granted by the Issuer in connection with the Reporting Person's service as a director.

3. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

4. Restricted stock units vest in three equal annual installments, beginning on October 15, 2025 and ending on October 15, 2027.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Deanne Larison, by power of attorney	10/16/2025
	** 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.

FAQ

What insider transaction did CMP report?

On 10/15/2025, 45,467 RSUs converted to common stock (code M) and 15,189 shares were withheld for taxes at $19.53 (code F).

How many CMP shares does the insider own after the transactions?

The insider directly beneficially owns 50,789 common shares after the reported transactions.

How many RSUs remain outstanding for the insider at CMP?

The filing shows 90,933 restricted stock units beneficially owned following the transaction.

What are the vesting terms for the CMP RSUs?

RSUs vest in three equal annual installments beginning on October 15, 2025 and ending on October 15, 2027.

What does Form 4 transaction code M mean in this context?

Code M indicates the conversion of a derivative security (RSUs) into common stock.

What does Form 4 transaction code F indicate here?

Code F indicates shares withheld to satisfy tax withholding obligations upon vesting.

What are the 4,882 CMP deferred stock units noted?

They are deferred stock units granted in connection with service as a director, shown as 4,882 units.