[Form 4] COMPASS MINERALS INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

Compass Minerals (CMP) director Lori A. Walker reported changes in her beneficial ownership on Form 4. The filing shows a 09/30/2025 grant of 1,563 common stock units to Ms. Walker with a $0 price, recorded as an acquisition tied to her director service, and a reported disposal of 3,053 common stock units (listed separately). After the reported acquisition, the filing shows Ms. Walker beneficially owns 42,229 shares indirectly through the Walker Joint Revocable Trust. The Form 4 was signed under power of attorney on 10/01/2025.

Insights

Financial Analyst

TL;DR: Director compensation included granted stock units; net holdings changed modestly, no priced purchase reported.

The filing documents non-cash director compensation: 1,563 common stock units granted at $0 on 09/30/2025, which is a routine equity award for board service. A separate line records a disposition of 3,053 units, reducing deferred holdings. Total indirect beneficial ownership is 42,229 shares via the Walker Joint Revocable Trust. These are governance/compensation-related movements and do not indicate market-priced acquisitions or sales that would directly signal trading intent.

Corporate Governance Expert

TL;DR: Routine director equity awards and a reported disposition; disclosure appears standard and compliant.

The Form 4 reflects customary director remuneration (stock units) and a recorded disposition of deferred units. The filing includes an exhibit reference for a power of attorney and is signed on 10/01/2025. No other governance actions or atypical related-party transactions are disclosed. For investors, these entries are procedural and contribute transparency on insider compensation and holdings.

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

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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^*

WALKER LORI A

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2025

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	09/30/2025		A		1,563(1)	A	$0	42,229	I	Walker Joint Revocable Trust
Common Stock(2)								3,053	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

Explanation of Responses:

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

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

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Deanne Larison, by power of attorney	10/01/2025
	** 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.
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