Is Johns Manville a Canadian company?

No, Johns Manville is not a Canadian company, it is an American company headquartered in Denver, Colorado, USA, though it has Canadian operations and a plant in Canada. Johns Manville was founded in 1858 as H.W. Johns Manufacturing Company in New York City, USA, by Henry Ward Johns, and became major American building products manufacturer, historically based in New York and New Jersey. Today, Johns Manville Corporation is headquartered at 717 17th Street, Denver, Colorado, and is wholly owned subsidiary of Berkshire Hathaway, American conglomerate led by Warren Buffett based in Omaha, Nebraska, which acquired Johns Manville in 2001 for 1.8 billion dollars. Johns Manville has manufacturing plants worldwide, including one in Canada at Innisfail, Alberta, which makes fiberglass insulation for Canadian market, and distribution centers across Canada, so it has Canadian presence and Canadian-made products, but it is American company, not Canadian-owned. It is often confused as Canadian because it has Canadian plant and sells insulation at Canadian retailers like Home Depot Canada, and competes with Canadian companies. However, legally and historically, Johns Manville is American company, founded in USA, headquartered in USA, owned by American Berkshire Hathaway, with revenue around 3.5 billion dollars, and is part of US building products industry alongside Owens Corning and CertainTeed, not Canadian company.