Exhibit 99.1 TreeHouse Foods, Inc. Reports First Quarter 2025 Results First Quarter Adjusted EBITDA Exceeds Upper-End of Guidance Range Reiterates 2025 Outlook Oak Brook, IL, May 6, 2025 — TreeHouse Foods, Inc. (NYSE: THS) today reported financial results for the first quarter of 2025. "I am grateful to the entire TreeHouse team for its execution this quarter, which resulted in Adjusted EBITDA that exceeded the upper-end of our guidance range," said Steve Oakland, Chairman, Chief Executive Officer, and Pres ...