Exhibit 99.1 Press Release dated July 22, 2024 SIMPSON MANUFACTURING CO., INC. ANNOUNCES 2024 SECOND QUARTER FINANCIAL RESULTS Pleasanton, CA – July 22, 2024 l Net sales of $597.0 million lIncome from operations of$132.2 million, resulting in operating income margin of 22.1% l Net income per diluted share of $2.31 l Repurchased$50.0 million of common stock during the quarter Simpson Manufacturing Co., Inc. (the "Company") (NYSE: SSD), an industry leader in engineered structural connectors and building sol ...