Compass Minerals International, Inc. (NYSE:CMP) ("Compass Minerals" or the "company") today provided the following comment on the recent announcement by The White House that, effective Sept. 15, 2026, salt and pure sodium chloride produced in Canada are excluded from the 50% ad valorem Section 338 tariffs. The company operates the world’s largest underground salt mine in Goderich, Ontario, serving communities throughout the Northeast and Midwest by helping keep roads, bridges and other transportation infrastructure safe and operational during snow and ice events.

"We are grateful the Trump Administration recognized the critical role our salt products play in public safety and interstate commerce. We would also like to thank U.S. Senator Jerry Moran and others who worked alongside him for their advocacy on behalf of Compass Minerals and our industry."

About Compass Minerals

Compass Minerals (NYSE:CMP) is a leading global provider of essential minerals focused on safely delivering where and when it matters to help solve nature’s challenges for customers and communities. The company’s salt products help keep roadways safe during winter weather and are used in numerous other consumer, industrial, chemical and agricultural applications. Its plant nutrition products help improve the quality and yield of crops while supporting sustainable agriculture. Compass Minerals operates 11 production and packaging facilities with more than 1,800 employees throughout the U.S., Canada and the U.K. Visit compassminerals.com for more information about the company and its products.

Forward-Looking Statements and Other Disclaimers

This press release may contain forward-looking statements. These statements are based on the Company’s current expectations, estimates and projections and involve risks and uncertainties that could cause the Company’s actual results to differ materially. The differences could be caused by several factors including those factors identified in the "Risk Factors" and "Management’s Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company’s Annual and Quarterly Reports on Forms 10-K and 10-Q, including any amendments, as well as the Company’s other SEC filings. Opinions expressed are current opinions as of the date hereof. Investors are cautioned not to place undue reliance on such forward-looking statements and should rely on their own assessment of an investment. The Company undertakes no obligation to update any forward-looking statements made in this press release to reflect future events or developments, except as required by law.

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Investor Contact

SCR Partners, LLC

Tripp Sullivan

+1.615.942.7077

John Wilfong

+1.312.533.0234

InvestorRelations@compassminerals.com

Media Contact

Kevin Gabriel

Senior Director, Corporate Affairs

+1.913.344.9265

MediaRelations@compassminerals.com