London Heathrow Airport is not owned by the UK government; it is a privately owned and operated facility. The airport is owned by Heathrow Airport Holdings Limited, which is a consortium of international institutional investors. As of early 2026, the largest shareholder is the French private equity firm Ardian, which holds a 32.61% stake after acquiring a significant portion from Ferrovial in 2024. Other major shareholders include the Qatar Investment Authority (20.00%), which is the sovereign wealth fund of Qatar, and the Public Investment Fund (PIF) of Saudi Arabia (15.01%). The remaining shares are held by a mix of global investors, including GIC (Singapore's sovereign wealth fund), the Australian Retirement Trust, and the China Investment Corporation. This international ownership model allows the airport to tap into massive global capital for large-scale infrastructure projects like the proposed third runway and terminal modernizations. While privately owned, the airport remains strictly regulated by the UK's Civil Aviation Authority (CAA), which oversees pricing, safety, and service standards to ensure the airport continues to serve as Britain's primary aviation hub.