Compass Minerals International, Inc. (NYSE:CMP) ("Compass Minerals" or the "Company") today announced that S&P Global Ratings has upgraded the Company’s corporate credit rating to ‘B+’ from ‘B’, with a stable outlook. S&P also upgraded the rating on the Company’s senior secured debt to ‘BB’ from ‘BB-‘ and senior unsecured debt to ‘B+’ from ‘B’. In addition, S&P’s ‘1’ recovery rating on the secured debt and ‘4’ recovery rating on the unsecured debt are unchanged.

The upgrade reflects S&P’s view that the Company’s debt paydown and improved profitability for leverage reduction has lowered S&P Global Ratings-adjusted leverage from 4.2x to 3.1x for the last 12 months. S&P noted the Company used "sale proceeds with cash on the balance sheet to retire $150 million of its 2027 senior unsecured notes, materially improving its debt profile and extending weighted-average maturity. Additionally, higher profitability in the first quarter from a significant increase in highway deicing volumes reduced leverage."

S&P also noted: "The stable outlook reflects our expectation that Compass will maintain leverage below 4x in the next two years from debt reduction, strategic initiatives, and favorable operating performance, although we anticipate volumes will taper down next year."

Ed Dowling, Chief Executive Officer, said: "We are very proud that S&P has recognized the hard work we have done to reduce our debt and lower our leverage ratio. The upgrade is a strong endorsement and reflects the momentum Compass Minerals has created by building a stronger, more resilient business with a solid platform to deliver long-term shareholder value."

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

Brent Collins

Vice President, Treasurer & Investor Relations

+1.913.344.9111

InvestorRelations@compassminerals.com

Media Contact

Kevin Gabriel

Senior Director, Corporate Affairs

+1.913.344.9265

MediaRelations@compassminerals.com