Compass Minerals International Inc SEC filings CMP
Compass Minerals International Inc has 1,005 filings in SEC EDGAR's recent list, going back to Oct 2, 2017. Its latest annual report, Form 10-K, was filed on Dec 12, 2025 for the period ended Sep 30, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 28, 2026 (officer or director change). The company's fiscal year ends on September 30.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Officer or director change
|
Oct 28, 2026 | Oct 22, 2026 |
| 4 | Insider transaction | Oct 19, 2026 | Oct 15, 2026 |
| 4 | Insider transaction | Oct 19, 2026 | Oct 15, 2026 |
| 4 | Insider transaction | Oct 19, 2026 | Oct 15, 2026 |
| 4 | Insider transaction | Oct 19, 2026 | Oct 15, 2026 |
| 4 | Insider transaction | Oct 15, 2026 | Oct 9, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 15, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 1, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Sep 15, 2026 | Sep 11, 2026 |
| S-8 | Employee stock plan registration | Aug 27, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| 3 | Initial insider ownership | Aug 13, 2026 | Aug 3, 2026 |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Officer or director change
|
Aug 5, 2026 | Aug 3, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Jul 29, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 1, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 1, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 1, 2026 | Jun 30, 2026 |
| 11-K | Employee savings plan report | Jun 29, 2026 | Dec 31, 2025 |
| SD | Specialized disclosure (conflict minerals) | Jun 26, 2026 | — |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 14, 2026 | May 13, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 12, 2026 | — |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 6, 2026 | May 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 27, 2026 | — |
| 4 | Insider transaction | Apr 1, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Mar 31, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Mar 24, 2026 | Mar 20, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Mar 10, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 9, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 3, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 9, 2026 | — |
| 10-Q | Quarterly report | Feb 6, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 4, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Jan 29, 2026 | Dec 18, 2025 |
| 3 | Initial insider ownership | Jan 29, 2026 | Dec 18, 2025 |
| 4 | Insider transaction | Jan 29, 2026 | Dec 18, 2025 |
| 3 | Initial insider ownership | Jan 29, 2026 | Dec 18, 2025 |
| 4 | Insider transaction | Jan 29, 2026 | Jan 28, 2026 |
| 4 | Insider transaction | Jan 26, 2026 | Dec 18, 2025 |
| 3 | Initial insider ownership | Jan 26, 2026 | Dec 18, 2025 |
| DEFA14A | Additional proxy material | Jan 23, 2026 | — |
| DEF 14A | Proxy statement | Jan 23, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Jan 20, 2026 | Jan 18, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 18, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 3 | Initial insider ownership | Jan 5, 2026 | Dec 18, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Other events
|
Dec 23, 2025 | Dec 10, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 19, 2025 | Dec 18, 2025 |
| 10-K | Annual report | Dec 12, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Dec 8, 2025 | Dec 8, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 18, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 10, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 30, 2025 | — |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Oct 16, 2025 | Oct 15, 2025 |
| 4 | Insider transaction | Oct 9, 2025 | Sep 11, 2025 |
| 3 | Initial insider ownership | Oct 9, 2025 | Sep 11, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Other events
|
Aug 28, 2025 | Aug 15, 2025 |
| 144 | Notice of proposed sale | Aug 27, 2025 | — |
| 144 | Notice of proposed sale | Aug 19, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 10-Q | Quarterly report | Aug 11, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2025 | Aug 11, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 17, 2025 | — |
| 4/A | Form 4/a | Jul 3, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 1, 2025 | Jun 30, 2025 |
| SD | Specialized disclosure (conflict minerals) | Jun 27, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Jun 27, 2025 | Jun 26, 2025 |
| 11-K | Employee savings plan report | Jun 26, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jun 25, 2025 | Jun 24, 2025 |
| 4 | Insider transaction | Jun 17, 2025 | May 13, 2025 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Jun 16, 2025 | Jun 16, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 3, 2025 | Jun 3, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 18, 2025 |
| 144 | Notice of proposed sale | May 19, 2025 | — |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 7, 2025 | May 7, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 28, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 28, 2025 | — |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Mar 27, 2025 | Mar 26, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Mar 25, 2025 | Mar 25, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Mar 11, 2025 | Mar 6, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 3 | Initial insider ownership | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Feb 28, 2025 |
| DEFA14A | Additional proxy material | Feb 18, 2025 | — |
| 10-Q | Quarterly report | Feb 10, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 10, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 5, 2025 | Oct 15, 2024 |
| 4 | Insider transaction | Feb 5, 2025 | Jan 28, 2025 |
| 3 | Initial insider ownership | Feb 5, 2025 | Jan 28, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Jan 28, 2025 | Jan 27, 2025 |
| DEFA14A | Additional proxy material | Jan 23, 2025 | — |
| DEF 14A | Proxy statement | Jan 23, 2025 | Mar 6, 2025 |
| 4 | Insider transaction | Jan 21, 2025 | Jan 18, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Dec 19, 2024 | Dec 18, 2024 |
| 10-K | Annual report | Dec 16, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Dec 16, 2024 | Dec 16, 2024 |
| S-8 | Employee stock plan registration | Nov 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 8, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 4, 2024 | — |
| 10-Q | Quarterly report | Oct 30, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2024 | Oct 29, 2024 |
| 10-Q/A | Amended quarterly report | Oct 30, 2024 | Mar 31, 2024 |
| 10-K/A | Amended annual report | Oct 29, 2024 | Sep 30, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 23, 2024 | — |
| 4 | Insider transaction | Oct 17, 2024 | Oct 15, 2024 |
| 4 | Insider transaction | Oct 17, 2024 | Oct 15, 2024 |
| 4 | Insider transaction | Oct 17, 2024 | Oct 15, 2024 |
| 4 | Insider transaction | Oct 17, 2024 | Oct 15, 2024 |
| 4 | Insider transaction | Oct 17, 2024 | Oct 15, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 17, 2024 | — |
| 4 | Insider transaction | Oct 1, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 1, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 1, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 1, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 1, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Material agreement, Other events
|
Sep 19, 2024 | Sep 13, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Sep 19, 2024 | — |
| 8-K |
Current report
Results of operations
|
Sep 17, 2024 | Sep 17, 2024 |
| SC 13G | Ownership over 5% (passive) | Sep 16, 2024 | — |
| 8-K |
Current report
Material agreement, Listing notice, Regulation FD disclosure
|
Aug 16, 2024 | Aug 12, 2024 |
| NT 10-Q | Filing | Aug 9, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Aug 2, 2024 | Aug 1, 2024 |
| 3 | Initial insider ownership | Aug 2, 2024 | Aug 1, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 2, 2024 | — |
| SD | Specialized disclosure (conflict minerals) | Jul 19, 2024 | — |
| 11-K | Employee savings plan report | Jul 12, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Restatement
|
Jul 3, 2024 | Jun 28, 2024 |
| 3 | Initial insider ownership | Jul 2, 2024 | Jul 1, 2024 |
| 8-K |
Current report
Officer or director change
|
Jul 1, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 1, 2024 | Jun 28, 2024 |
| 4 | Insider transaction | Jul 1, 2024 | Jun 28, 2024 |
| 4 | Insider transaction | Jul 1, 2024 | Jun 28, 2024 |
| 4 | Insider transaction | Jul 1, 2024 | Jun 28, 2024 |
| 4 | Insider transaction | Jul 1, 2024 | Jun 28, 2024 |
| NT 11-K | Filing | Jun 28, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 25, 2024 | Jun 21, 2024 |
| 4 | Insider transaction | Jun 11, 2024 | Jun 7, 2024 |
| 8-K |
Current report
Officer or director change
|
Jun 10, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | May 21, 2024 | May 18, 2024 |
| 4 | Insider transaction | May 21, 2024 | May 18, 2024 |
| 4 | Insider transaction | May 21, 2024 | May 18, 2024 |
| 8-K |
Current report
Bylaw or fiscal year change
|
May 17, 2024 | May 16, 2024 |
| 10-Q | Quarterly report | May 15, 2024 | Mar 31, 2024 |
| NT 10-Q | Filing | May 10, 2024 | Mar 31, 2024 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Mining & Quarrying of Nonmetallic Minerals (No Fuels) (SIC 1400)
- Listed as
- CMP (NYSE)
- Fiscal year ends
- September 30
- Incorporated in
- DE
- Headquarters
- Overland Park, KS
- SEC filer status
- Accelerated filer
- SEC CIK
- 1227654
- Former names
- SALT HOLDINGS CORP (until Nov 5, 2003)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.