[Form 4] COMPASS MINERALS INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

Compass Minerals (CMP) reported insider activity by its Chief Commercial Officer. On 10/15/2025, 7,408 shares of common stock were acquired at $0 per share upon settlement of restricted stock units (code M). To cover taxes on the vesting, 2,176 shares were withheld at $19.53 (code F).

After these transactions, the officer directly owned 13,213 shares, plus 249 shares held indirectly in a 401(k) plan as of October 15, 2025. The Form 4 also reflects RSU settlements tied to prior grants: 464 and 855 shares vested with remaining RSU balances of 0 and 856, and 6,089 shares vested from a grant with 12,179 RSUs remaining, consistent with stated vesting schedules ending on October 15, 2025, 2026, and 2027.

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).

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^*

Nichols Benjamin S.

(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)

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

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		7,408	A	$0	15,389	D
Common Stock	10/15/2025		F		2,176(1)	D	$19.53	13,213	D
Common Stock								249(2)	I	401(k) Plan

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			464	(4)	10/15/2025	Common Stock	464	$0	0	D
Restricted Stock Unit	(3)	10/15/2025		M			855	(5)	10/15/2026	Common Stock	855	$0	856	D
Restricted Stock Unit	(3)	10/15/2025		M			6,089	(6)	10/15/2027	Common Stock	6,089	$0	12,179	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. The reported number is based on a 401(k) plan statement dated as of October 15, 2025.

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 the first anniversary of the grant date and ending on October 15, 2025.

5. Restricted stock units vest in three equal annual installments, beginning on the first anniversary of the grant date and ending on October 15, 2026.

6. Restricted stock units vest in three equal annual installments, beginning on the first anniversary of the grant date and ending on October 15, 2027.

Remarks:

	/s/ Jared Campbell, 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 did CMP’s CCO report on Form 4?

On 10/15/2025, 7,408 shares were acquired at $0 via RSU settlement (code M), and 2,176 shares were withheld at $19.53 for taxes (code F).

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

Direct ownership is 13,213 shares, with 249 shares held indirectly in a 401(k) plan as of October 15, 2025.

What do transaction codes M and F mean here?

Code M reflects acquisition upon RSU settlement at $0; code F reflects shares withheld to satisfy tax obligations at $19.53.

What RSU vesting details were disclosed for CMP?

RSUs vest in three equal annual installments ending on October 15, 2025; October 15, 2026; and October 15, 2027.

What RSU balances remain after vesting events?

Remaining balances shown are 0 for one grant, 856 for another, and 12,179 for a third.

What is the issuer and ticker for this Form 4?

Compass Minerals International, Inc., ticker CMP.