CMP director acquires shares via RSU conversion

COMPASS MINERALS INTERNATIONAL INC director Melissa M. Miller reported equity-based compensation activity.

Rhea-AI Filing Summary

COMPASS MINERALS INTERNATIONAL INC director Melissa M. Miller reported equity-based compensation activity. She exercised 11,905 Restricted Stock Units into 11,905 shares of common stock at a stated price of $0.0000 per share and now holds 43,152 common shares directly.

She also received a new grant of 5,032 Restricted Stock Units, bringing her directly held RSUs to 5,032. According to the footnote, this annual RSU grant for director service will vest on the earlier of the day immediately preceding the issuer's next annual meeting (if held at least 50 weeks from the grant date) or the first anniversary of the grant date.

Insider Trade Summary

11,905 shares exercised/converted

Exercise 3 txns

Insider Miller Melissa M

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	11,905	$0.00	$0.00
Grant/Award	Restricted Stock Unit	5,032	$0.00	$0.00
Exercise	Common Stock	11,905	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 5,032 contracts (Direct); Common Stock — 43,152 shares (Direct)

Footnotes (1)

1. F1. Represents annual grant of restricted stock units in connection with the Reporting Person's service as a director, which will vest on the earlier of (a) the day immediately preceding the Issuer's next annual meeting (as long as the meeting is held at least 50 weeks from the grant date) and (b) the first anniversary of the grant date.

FAQ

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

What insider transactions did CMP director Melissa M. Miller report?

Melissa M. Miller reported exercising 11,905 Restricted Stock Units into 11,905 shares of COMPASS MINERALS common stock and receiving a new grant of 5,032 Restricted Stock Units, all held directly as part of her director compensation.

How many COMPASS MINERALS (CMP) shares does Melissa M. Miller now hold?

Following the reported transactions, Melissa M. Miller directly holds 43,152 shares of COMPASS MINERALS common stock and 5,032 Restricted Stock Units, reflecting her equity position related to service on the company’s board of directors.

What was the size of Melissa M. Miller's new RSU grant at CMP?

Melissa M. Miller received a new grant of 5,032 Restricted Stock Units from COMPASS MINERALS. This award represents part of her annual equity compensation for serving as a director and increases her directly held restricted stock units to 5,032.

When will Melissa M. Miller’s new COMPASS MINERALS RSUs vest?

The new 5,032 Restricted Stock Units will vest on the earlier of the day immediately preceding COMPASS MINERALS’ next annual meeting, if held at least 50 weeks after grant, or the first anniversary of the grant date, according to the disclosure.

Were Melissa M. Miller’s COMPASS MINERALS transactions open-market buys or sales?

The reported transactions were an exercise or conversion of 11,905 Restricted Stock Units into common stock and a grant of 5,032 new Restricted Stock Units, with no open-market purchases or sales disclosed in this Form 4 filing.

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

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Accepted by SEC EDGAR 03/09/2026 - 04:48 PM Learn about SEC filing dates

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^*

Miller Melissa M

(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)
03/05/2026

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	03/05/2026		M		11,905	A	$0	43,152	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	$0	03/05/2026		M			11,905	03/05/2026	03/05/2026	Common Stock	11,905	$0	0	D
Restricted Stock Unit	$0	03/05/2026		A		5,032(1)		03/04/2027	03/04/2027	Common Stock	5,032	$0	5,032	D

Explanation of Responses:

1. Represents annual grant of restricted stock units in connection with the Reporting Person's service as a director, which will vest on the earlier of (a) the day immediately preceding the Issuer's next annual meeting (as long as the meeting is held at least 50 weeks from the grant date) and (b) the first anniversary of the grant date.

Remarks:

	/s/ Deanne Larison, by power of attorney	03/09/2026
	** 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.