Exhibit 99.1 Post Holdings Reports Results for the Second Quarter of Fiscal Year 2024; Raises Fiscal Year 2024 Outlook St. Louis - May 2, 2024 - Post Holdings, Inc. (NYSE:POST), a consumer packaged goods holding company, today reported results for the second fiscal quarter ended March 31, 2024. Highlights: • Second quarter net sales of $2.0 billion • Operating profit of $190.1 million; net earnings of $97.2 million and Adjusted EBITDA (non-GAAP)* of $345.2 million • Raised fiscal year 2024 Adjusted EBITDA ( ...