Louisiana-Pacific Corporation
A maker of engineered wood building products, Louisiana-Pacific is the largest producer of siding in North America, with brands like LP SmartSide used by home builders and renovators. Born in 1973 when a court-ordered antitrust ruling forced Georgia-Pacific to spin off part of its business, it kept the "Pacific" and added Louisiana. In 1979 it opened North America's first oriented strand board mill, a product so popular the plant ran around the clock.