Quick Answer: Topsoe is a Danish company founded in 1940 by Haldor Topsøe. The company has approximately 2,300 employees, of which 1,700 work in Denmark. The company specializes in technologies aimed at reducing carbon emissions, supplying technology, catalysts, and services for the global energy transition. That includes proprietary Solid oxide electrolyzer cell high-temperature electrolysis technology, the production of heterogeneous catalysts and the design of process plants based on catalytic processes. Focus areas include hard-to-abate sectors such as heavy industry, long-haul transportation and clean fuels bio-diesel and ultra-low-sulfur diesel.