Exhibit 99.1 TreeHouse Foods, Inc. Reports First Quarter 2024 Results TreeHouse First Quarter Net Sales Exceed Guidance Range Reaffirms 2024 Annual Guidance • Net sales of $820.7 million exceeded the Company's guidance range of$780 to $810 million. • Net loss from continuing operations was$(11.7) million. • Adjusted EBITDA1 of $46.0 million was within the Company's guidance range of$45 to $55 million. • Repurchased approximately$44 million of company shares during the quarter. • Reaffirmed 2024 outlook ...