The Spanish construction giant Ferrovial FERF.AS announced Thursday that it had closed the sale of a 19.75 percent stake in Heathrow Airport Holdings for 2 billion euros ($2.10 billion) to French investment company Ardian and in sovereign wealth fund PIF of Saudi Arabia.

Other shareholders in FGP Topco Ltd, the parent company of Heathrow Airport Holdings, sold an additional 17.87% stake, taking the takeover from Ardian and PIF up to £4bn. euros for 37.62%, Ferrovial said.

Heathrow Airport Holdings is a company that operates and manages Heathrow Airport based in London, England. It was created by the privatization of the British Airports Authority as BAA plc as part of Margaret Thatcher’s privatization of state assets, and was once a constituent of the FTSE 100 index.

OR BAA plc it was purchased in 2006 by a consortium led by Ferrovial, a Spanish company specializing in the design, construction, financing, operation and maintenance of transport, urban and service infrastructure. In March 2009, the company was finally asked to sell Gatwick and Stansted airports. Eventually, over the next few years BAA sold all of its airports apart from Heathrow. The company was renamed Heathrow Airport Holdings in 2012 to reflect its core business.

The company’s headquarters are located at the Compass Center at Heathrow Airport in the London Borough of Hillingdon. The company makes money by charging airlines landing fees and departure levies, as well as ancillary activities within those airports, such as retail, car parking and property.