and Exhibit 99.1 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Chief Operations Officer — Patrick Merrin: Patrick Merrin ceased to serve as Chief Operations Officer, and Brandon Risner was appointed as the new Chief Operating Officer.

and Exhibit 99.1 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Other Events. On March 20, 2026, Compass Minerals International, Inc. (“Compass Minerals”) delivered a notice of full redemption to Computershare Trust Company, N.A., as trustee (the “Trustee”), for its outstanding 6.750% Senior Notes due 2027 (the “2027 Notes”), pursuant to the indenture governing the 2027 Notes, dated as of November 26, 2019 (the “Indenture”). On March 20, 2026, the Trustee provided notice of redemption to the holders of the 2027 Notes in accordance with the applicable proc…

and Exhibit 99.1 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

The Board of Directors increased the size from eight to twelve and appointed four new directors as part of a refreshment initiative.

and Exhibit 99.1 of this Current Report on Form 8-K (this "Form 8-K") is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

and Exhibit 99.1 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Chief Legal and Administrative Officer and Corporate Secretary — Mary L. Frontczak: Mary L. Frontczak ceased to serve as Chief Legal and Administrative Officer and Corporate Secretary.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. Notes and Indenture On June 16, 2025, Compass Minerals issued $650,000,000 aggregate principal amount of the Notes. The Notes bear interest at a rate of 8.000% per year and mature on July 1, 2030. Interest is payable on January 1 and July 1 of each year, commencing on January 1, 2026. The Notes are Compass Minerals’ senior unsecured obligations and are guaranteed by certain of it…

Entry into a Material Definitive Agreement. Senior Notes Offering and Indenture On June 16, 2025, Compass Minerals International, Inc. (“Compass Minerals”) issued $650 million aggregate principal amount of 8.000% senior notes due 2030 (the “Notes”) in a private offering. The Notes are senior unsecured obligations of Compass Minerals and are guaranteed by certain of its domestic subsidiaries. The Notes were sold only to persons reasonably believed to be qualified institutional buyers in relian…

Regulation FD Disclosure. Senior Notes Offering On June 3, 2025, Compass Minerals International, Inc. (“Compass Minerals”) issued a press release announcing that it has priced an offering of $650 million aggregate principal amount of 8.000% senior notes due 2030 (the “Notes”) in a private offering. The sale of the Notes is expected to be completed on or about June 16, 2025, subject to customary closing conditions. The Notes will be senior unsecured obligations of Compass Minerals and will be…

and Exhibit 99.1 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Chief Supply Chain Officer — Jennifer Hood: Ms. Hood ceased to serve as Chief Supply Chain Officer and received severance payments.

and Exhibit 99.1 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Chief Operations Officer — Patrick Merrin: The company appointed a new Chief Operations Officer from an external candidate with extensive industry experience.

and Exhibit 99.1 of this Current Report on Form 8-K (this "Form 8-K") is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

and Exhibit 99.1 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Other Events. On September 18, 2024, the Company received a notice of default (the “Notice”) relating to its 6.750% Senior Notes due 2027 (the “Notes”). The Notice was delivered to the Company by Computershare Trust Company, National Association, as successor to Wells Fargo Bank, National Association, as trustee (the “Trustee”), pursuant to that certain Indenture, dated as of November 26, 2019, by and among the Company, the Guarantors named therein and the Trustee (the “Indenture”). The Notic…

Entry into a Material Definitive Agreement. On September 13, 2024, Compass Minerals International, Inc. (the “Company”) entered into an amendment no. 3 (the “Credit Agreement Amendment”) to the credit agreement dated as of April 20, 2016 (as amended and restated as of November 26, 2019, as further amended and restated as of May 5, 2023 and as further amended as of March 27, 2024 and August 12, 2024, the “Credit Agreement”) among the Company, Compass Minerals Canada Corp., Compass Minerals UK…

Results of Operations and Financial Condition. On September 17, 2024 , Compass Minerals International, Inc. issued a press release regarding its preliminary fiscal 2024 third quarter financial results. These preliminary financial results are unaudited, based on currently available information and do not present all necessary information for a complete understanding of the Company’s financial condition as of June 30, 2024 or its results of operations for the quarter ended June 30, 2024. A copy…

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On August 15, 2024, the Company received written notice from the New York Stock Exchange (the “Exchange”) that the Company is not in compliance with the Exchange’s continued listing standards as set forth in Section 802.01E of the NYSE Listed Company Manual as a result of the Company’s failure to timely file (the “Filing Delinquency”) its Form 10-Q for the period ended June 30, 2024 (the “Repo…

Entry into a Material Definitive Agreement. On August 12, 2024, Compass Minerals International, Inc. (the “Company”) entered into an amendment no. 2 (the “Credit Agreement Amendment”) to the credit agreement dated as of April 20, 2016 (as amended and restated as of November 26, 2019, as further amended and restated as of May 5, 2023 and as further amended as of March 27, 2024, the “Credit Agreement”) among the Company, Compass Minerals Canada Corp., Compass Minerals UK Limited, the other loan…

Non-Reliance on Previously Issued Financial Statements or a Related Audit Report or Completed Interim Review. On June 28, 2024, the Audit Committee (the “Audit Committee”) of the Board of Directors of Compass Minerals International, Inc. (the “Company”) determined, based on the recommendation of management following its consultation with the Company’s current (KPMG LLP, “KPMG”) and former (Ernst & Young LLP, “EY”) independent registered public accounting firms, that the Company’s (i) unaudite…

Vice President, Corporate Controller and Principal Accounting Officer — Ashley Ward: Appointment of a new Vice President, Corporate Controller and Principal Accounting Officer.