Compass Minerals (CMP) COO logs RSU vesting and tax share withholding

Rhea-AI Filing Summary

Compass Minerals International Chief Operations Officer Patrick James Merrin reported equity award activity. On March 3, 2026, restricted stock units converted into 18,525 shares of common stock. In connection with this vesting, 5,003 shares were withheld at $24.68 per share to cover tax obligations, leaving 13,522 shares of common stock held directly.

Each restricted stock unit represents the right to receive one share of common stock. The units vest in scheduled annual installments through March 3, 2027 and March 3, 2028, reflecting ongoing multi‑year compensation for the executive.

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^*

Merrin Patrick James

(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 Operations Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/03/2026

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	03/03/2026		M		18,525	A	$0	18,525	D
Common Stock	03/03/2026		F		5,003(1)	D	$24.68	13,522	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	(2)	03/03/2026		M			11,047	(3)	03/03/2028	Common Stock	11,047	$0	22,094	D
Restricted Stock Unit	(2)	03/03/2026		M			7,478	(4)	03/03/2027	Common Stock	7,478	$0	7,477	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. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

3. Restricted stock units vest in three equal annual installments, beginning on the first anniversary of the grant date and ending on March 3, 2028.

4. Restricted stock units vest in two equal annual installments, beginning on the first anniversary of the grant date and ending on March 3, 2027.

Remarks:

	/s/ Jared Campbell, by power of attorney	03/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did CMP’s COO report on this Form 4?

Compass Minerals’ Chief Operations Officer reported restricted stock units converting into 18,525 shares of common stock. In the same transaction group, 5,003 shares were withheld to satisfy tax obligations tied to the vesting of these equity awards.

Were the CMP COO’s Form 4 transactions open-market buys or sells?

No open-market buys or sells were reported. The Form 4 shows derivative exercises of restricted stock units and a tax-withholding disposition, where 5,003 shares were withheld to satisfy tax liabilities from the vesting event.

How many CMP shares does the COO hold after these transactions?

Following the reported transactions, the Chief Operations Officer directly holds 13,522 shares of Compass Minerals common stock. This figure reflects the vesting-related share issuance and the 5,003 shares withheld to cover tax obligations on March 3, 2026.

What do the CMP restricted stock unit footnotes explain?

The footnotes state each restricted stock unit equals one share of common stock and clarify the vesting schedules. Some units vest in three equal annual installments through March 3, 2028, while others vest in two equal annual installments through March 3, 2027.

Why were 5,003 CMP shares disposed of in the Form 4?

The 5,003-share disposition reflects tax withholding, not a market sale. These shares were withheld to satisfy tax obligations arising from the vesting and release of restricted stock units listed in the derivative securities table.