Exhibit 99.1 Press Release dated April 28, 2025 Simpson Manufacturing Co., Inc. Announces 2025 First Quarter Financial Results and Reaffirms 2025 Guidance Pleasanton, CA - April 28, 2025: Simpson Manufacturing Co., Inc. (the "Company") (NYSE: SSD), an industry leader in engineered structural connectors and building solutions, today announced its financial results for the first quarter of 2025. All comparisons below (which are generally indicated by words such as "increased," "decreased," "remained," or "com ...