Compass Minerals HR chief converts 7,298 RSUs

CMP’s chief human resources officer had RSUs vest into common stock, with a portion of shares withheld to cover tax obligations.

Rhea-AI Filing Summary

COMPASS MINERALS INTERNATIONAL INC (CMP) reported that Chief Human Resources Officer Amy Tills exercised and converted 7,298 restricted stock units into an equal number of shares of common stock on September 11, 2026. In connection with this vesting, 2,142 shares of common stock were withheld to satisfy tax withholding obligations, rather than sold in the open market. The filing notes that each restricted stock unit represents a contingent right to receive one share of common stock and that the remaining tranche of this award will continue to vest equally on September 11, 2027. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

7,298 shares exercised/converted

Exercise 3 txns

Insider Tills Amy

Role Chief Human Resources Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit F2, F3	7,298	$0.00	$0.00
Exercise	Common Stock	7,298	$0.00	$0.00
Tax Withholding	Common Stock F1	2,142	$24.80	$53K

Holdings After Transaction: Restricted Stock Unit — 7,297 contracts (Direct); Common Stock — 5,156 shares (Direct)

Footnotes (3)

1. F1. 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. F2. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.
3. F3. 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

Key Figures

RSUs exercised and converted: 7,298 units/shares Shares withheld for taxes: 2,142 shares Tax withholding valuation price: $24.80 per share +2 more

5 metrics

RSUs exercised and converted 7,298 units/shares Restricted stock units converted into CMP common stock on September 11, 2026

Shares withheld for taxes 2,142 shares Common shares withheld to satisfy tax withholding obligations on RSU vesting

Tax withholding valuation price $24.80 per share Per-share value used for 2,142 shares withheld under transaction code F

Remaining RSUs after transaction 7,297 units Total restricted stock units reported following the derivative transaction

RSU vesting continuation date September 11, 2027 Date through which the remaining tranche of RSUs will continue to vest equally

Key Terms

Restricted Stock Unit, contingent right, tax withholding obligations, vesting

4 terms

Restricted Stock Unit financial

"security title is listed as Restricted Stock Unit, representing a contingent right"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

contingent right financial

"Each restricted stock unit represents a contingent right to receive one share"

tax withholding obligations financial

"Represents the number of shares withheld to satisfy tax withholding obligations"

vesting financial

"The first tranche of these restricted stock units vest on the first anniversary"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What insider transactions did CMP’s chief human resources officer report on this Form 4?

Amy Tills reported the exercise and conversion of 7,298 restricted stock units into common stock on September 11, 2026, and a related withholding of 2,142 shares of common stock to satisfy tax withholding obligations tied to that vesting.

How many Compass Minerals (CMP) RSUs vested and converted for the officer?

On September 11, 2026, 7,298 restricted stock units vested for Amy Tills and were converted into 7,298 shares of CMP common stock, as each restricted stock unit represents a contingent right to receive one share of issuer common stock.

Were CMP shares sold into the market in this Form 4, or only withheld for taxes?

The Form 4 reports 2,142 shares of CMP common stock disposed of under code F, with a footnote stating these shares were withheld to satisfy tax withholding obligations on the RSU vesting. It does not describe open-market sales.

At what price were CMP shares withheld to cover tax obligations?

Shares withheld to cover tax obligations were valued at $24.80 per share for the 2,142 shares of CMP common stock delivered or withheld in connection with the vesting and release of the restricted stock units on September 11, 2026.

Does the CMP Form 4 indicate a Rule 10b5-1 trading plan for these transactions?

No. The Form 4’s Rule 10b5-1 checkbox is not checked, and the footnotes do not reference a trading plan, so the reported RSU vesting, conversion, and tax-withholding transactions are not described as made under a Rule 10b5-1 plan.

What is the future vesting schedule for the CMP restricted stock units reported?

A footnote states that the first tranche of these restricted stock units vests on the first anniversary of the grant date and that the remaining tranche will continue to vest, equally, on September 11, 2027, indicating ongoing vesting of this award.

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

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Available on EDGAR 09/15/2026 - 04:57 PM Accepted by SEC EDGAR 09/15/2026 - 04:56 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^*

Tills Amy

(Last) (First) (Middle)

C/O COMPASS MINERALS INTERNATIONAL, INC.

9900 W 109TH ST STE 100

(Street)

OVERLAND PARK KANSAS 66210

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	09/11/2026		M		7,298	A	$0	7,298	D
Common Stock	09/11/2026		F		2,142(1)	D	$24.8	5,156	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)	09/11/2026		M			7,298	(3)	09/11/2027	Common Stock	7,298	$0	7,297	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. 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/ Jared Campbell, by power of attorney	09/15/2026
	** 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.
* Form 4: SEC 1474 (03-26)