Simpson Manufacturing Co Inc (Simpson) is a company that designs, engineers, and manufactures structural solutions primarily for wood and concrete construction. It offers products include connectors, truss plates, screw fastening systems, fasteners, and pre-fabricated lateral-force resisting systems. These products are used in light-frame building applications to support and connect wood structures. For concrete construction, Simpson provides adhesives, mechanical anchors, structural support assemblies, and other repair and protection products. The company also offers engineering and professional services to support product specification and adoption, along with digital tools and design, planning, and estimating software. Simpson serves various industries, including residential construction, commercial construction, original equipment manufacturers (OEM), component manufacturers, and national retail markets. The company classifies its operations into three reportable operational segments: Wood Construction, Concrete Construction and Other. Simpson offers a diverse portfolio of products and services. As of February 2026, the company operated 81 facilities, including manufacturing centers, warehouses, research and development facilities, and sales offices. The company owned 39 properties in North America, 33 in Europe, and 9 in Asia/Pacific, totaling approximately 7,278 thousand square feet.

Simpson has undertaken several R&D initiatives, developing over 67 new products in FY2025. These include new connectors and lateral products for wood framing applications, connectors and fasteners for mass timber and offsite constructions, connections for structural steel construction, connectors for cold-formed steel applications, fastener products and tools for wood construction, mechanical and adhesive anchors for concrete and masonry construction, and repair and strengthening systems for concrete and masonry applications. The R&D unit of the company is responsible for developing extensive bar coding and merchandising aids and focusing on DIY products as part of their R&D efforts. In FY2025, the company incurred R&D expenses of US$82.4 million, which as a percentage of revenue stood at 3.5%.