Passage: Greater Helsinki generates approximately one third of Finland's GDP. GDP per capita is roughly 1.3 times the national average. Helsinki profits on serviced-related IT and public sectors. Having moved from heavy industrial works, shipping companies also employ a substantial number of people.The metropolitan area's gross value added per capita is 200% of the mean of 27 European metropolitan areas, equalling those of Stockholm and Paris. The gross value added annual growth has been around 4%.83 of the 100 largest Finnish companies have their headquarters in Greater Helsinki. Two-thirds of the 200 highest-paid Finnish executives live in Greater Helsinki and 42% in Helsinki. The average income of the top 50 earners was 1.65 million euro.The tap water is of excellent quality and it is supplied by 120 km (75 mi) long Päijänne Water Tunnel, one of the world's longest continuous rock tunnels.

Question: where are the headquarters?
Greater Helsinki