[Form 4] COMPASS MINERALS INTERNATIONAL INC Insider Trading Activity

Rhea-AI Filing Summary

Compass Minerals International reported a grant of 14,595 restricted stock units (RSUs) to Amy Tills, the Chief Human Resources Officer, executed on 09/11/2025. Each RSU converts to one share of common stock, so the award represents the right to receive 14,595 shares when vested. The first tranche vests on the first anniversary of the grant date, and the remaining units vest equally on 09/11/2027. The reported grant price is $0, indicating these are standard time‑based awards rather than purchases. The Form 4 was filed by a named filing agent under power of attorney on 10/09/2025.

Positive

• 14,595 RSUs granted to the Chief Human Resources Officer, aligning executive incentives with shareholders
• Time‑based vesting (first tranche at one year, remainder by 09/11/2027) supports retention
• Grant priced at $0, indicating no cash purchase and standard equity compensation

Negative

• Potential dilution of 14,595 shares upon vesting and settlement
• No performance conditions disclosed; vesting depends solely on continued service

Insights

Compensation Governance Analyst

Time‑based RSUs align CHRO pay with shareholder returns over two years.

The grant of 14,595 RSUs is a time‑based equity award that vests in a front tranche after one year and the rest equally by 09/11/2027. This structure ties the executive's reward to continued employment and eventual share issuance rather than immediate cash payout.

Dependencies include continued service through vesting dates and the company's share price at settlement; dilution equals 14,595 shares when vested. Monitor any future filings for additional grants or indications of performance conditions within the next 24 months.

Equity Markets Specialist

Grant size is fixed-share; market impact depends on total shares outstanding.

The award converts to 14,595 common shares at settlement and was reported with a grant price of $0, confirming these are restricted units rather than purchases. On their own, such grants are typically immaterial to large‑cap capitalization without context on share count.

Key near‑term items to watch are any subsequent Form 4 filings showing vesting-related transfers or net share settlement elections before 09/11/2027, which will show actual share movement into open market circulation.

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^*

Tills Amy

(Last) (First) (Middle)

C/O COMPASS MINERALS INTERNATIONAL, INC.

9900 W 109TH ST STE 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 Human Resources Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2025

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

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	(1)	09/11/2025		A		14,595		(2)	09/11/2027	Common Stock	14,595	$0	14,595	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

2. The first tranche of these restricted stock units vest on the first anniversary of the grant date. The remaining tranche will continue to vest, equally, on September 11, 2027.

Remarks:

	/s/ Deanne Larison, by power of attorney	10/09/2025
	** 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 Compass Minerals (CMP) report on 09/11/2025?

The company reported a grant of 14,595 restricted stock units (RSUs) to Amy Tills, the Chief Human Resources Officer, effective 09/11/2025.

How and when do the RSUs vest for CMP's CHRO?

The first tranche vests on the first anniversary of the grant date and the remaining units vest equally with the final tranche on 09/11/2027.

How many shares will the RSUs convert into for CMP?

Each RSU converts into one share of common stock, so the grant represents 14,595 shares upon full vesting.

Was there a purchase price for the RSUs reported?

The reported grant price is $0, indicating these are restricted stock units issued without a cash purchase price.

Who filed the Form 4 for this CMP transaction?

The Form 4 was signed under power of attorney by Deanne Larison and filed on 10/09/2025.