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Simpson Manufacturing Co., Inc., through its subsidiaries, engages in the design, engineering, manufacture, and sale of building construction products. The company offers wood construction products, including connectors, truss plates, fastening systems, fasteners, and pre-fabricated shearwalls; and concrete construction products comprising adhesives, specialty chemicals, mechanical anchors, carbide drill bits, powder actuated tools, and fiber reinforcing materials for use in concrete, masonry, and steel applications. It also provides a line of structural screws used to join plies of wood together or metal connectors to wood. The company markets its products to the residential construction, light industrial, commercial and infrastructure construction, remodeling, and do-it-yourself markets primarily in the United States, Canada, Europe, Asia, and the South Pacific. Simpson Manufacturing Co., Inc. was founded in 1956 and is based in Pleasanton, California.