Lori A. Walker - 05 Mar 2026 Form 4 Insider Report for COMPASS MINERALS INTERNATIONAL INC (CMP)

Reporting relationship: Director
Issuer ticker: CMP
Reported as of: 05 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 09 Mar 2026, 18:18:56 UTC
Prior SEC filing: 02 Jan 2026
Next SEC filing: 26 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Deanne Larison, by power of attorney

Key filing fact

Lori A. Walker filed Form 4 for COMPASS MINERALS INTERNATIONAL INC (CMP) on 09 Mar 2026.

Key facts

This page summarizes Lori A. Walker's Form 4 filing for COMPASS MINERALS INTERNATIONAL INC (CMP).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 09 Mar 2026, 18:18.

Change

Previous filing in this sequence was filed on 02 Jan 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001242956 Primary reporting owner

WALKER LORI A

Relationship: Director
Address: C/O COMPASS MINERALS INTERNATIONAL, INC., 9900 WEST 109TH STREET, SUITE 100, OVERLAND PARK
Signature: /s/ Deanne Larison, by power of attorney
Signature date: 09 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CMP transaction

Common Stock

Options Exercise

Transaction value
Shares: +11,905
Change %: +25%
Price: $0.000000^*
Shares after: 58,715
Date: 05 Mar 2026
Ownership: Walker Joint Revocable Trust
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CMP transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value
Shares: -11,905
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 05 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 11,905
Exercise price: $0.000000
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Lori A. Walker is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 2 footnotes

Footnote F1

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.

Footnote F2

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