Lori Walker (CMP) reports RSU conversion and stock unit distribution

Rhea-AI Filing Summary

COMPASS MINERALS INTERNATIONAL INC director Lori A. Walker reported equity compensation-related transactions, not open-market trades. On March 5, 2026, she exercised 11,905 restricted stock units at $0.00 per unit, converting them into the issuer’s common stock held indirectly through the Walker Joint Revocable Trust, which then held 58,715 shares.

On the same date, 990 deferred stock units were distributed to her in the form of common stock, and her ownership records were adjusted accordingly. A separate footnote explains this represents an annual grant of restricted stock units that vest in one year in connection with her service as a director.

Insider Trade Summary

11,905 shares exercised/converted

Mixed 2 txns

Insider WALKER LORI A

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	11,905	$0.00	--
Exercise	Common Stock	11,905	$0.00	--

Holdings After Transaction: Restricted Stock Unit — 0 shares (Direct); Common Stock — 58,715 shares (Indirect, Walker Joint Revocable Trust)

Footnotes (1)

1. On March 5, 2026, 990 deferred stock units were distributed to the Reporting Person in the form of Issuer's common stock. The Reporting Person's ownership has been adjusted to reflect this distribution. Represents annual grant of restricted stock units vesting in one year by Issuer in connection with the Reporting Person's service as a director.

Form 4 Insider Transactions: What Each Field Means →

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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X

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^*

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)
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	58,715(1)	I	Walker Joint Revocable Trust

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(2)	03/05/2026	03/05/2026	Common Stock	11,905	$0	0	D

Explanation of Responses:

1. On March 5, 2026, 990 deferred stock units were distributed to the Reporting Person in the form of Issuer's common stock. The Reporting Person's ownership has been adjusted to reflect this distribution.

2. Represents annual grant of restricted stock units vesting in one year by Issuer in connection with the Reporting Person's service as a director.

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.

FAQ

What insider transactions did CMP director Lori A. Walker report?

Lori A. Walker reported equity awards, not market trades. She exercised 11,905 restricted stock units into common stock and received 990 deferred stock units as common shares, reflecting routine director compensation at Compass Minerals International Inc.

How many Compass Minerals (CMP) shares were involved in Lori Walker’s Form 4?

The Form 4 shows 11,905 restricted stock units converted into common stock and 990 deferred stock units distributed as common shares. These transactions adjust Lori Walker’s reported ownership rather than reflecting open-market buying or selling activity.

How are Lori Walker’s CMP shares held after the March 5, 2026 transactions?

After converting 11,905 restricted stock units, 58,715 Compass Minerals common shares were reported as held indirectly through the Walker Joint Revocable Trust. This reflects indirect ownership associated with Lori Walker rather than shares held solely in her personal name.

What is the nature of the restricted stock unit grant to Lori Walker at CMP?

The filing notes an annual grant of restricted stock units that vest in one year, provided in connection with Lori Walker’s service as a director of Compass Minerals. These awards are a form of stock-based compensation, not a cash salary payment.

Did Lori Walker buy or sell Compass Minerals (CMP) stock on the market?

The reported transactions are exercises and distributions of stock-based awards, not open-market purchases or sales. Restricted stock units and deferred stock units were converted or distributed as Compass Minerals common stock as part of Lori Walker’s director compensation.