Spanish transport company Ferrovial is weighing options for the 25% stake it holds in London Heathrow Airport (LHR), Reuters reported.

Two people familiar with the matter told the news agency that the Spanish company held preliminary discussions with external advisers on the future of this stake.

Private equity firm Ardian is said to have consulted with its own advisers regarding a joint proposal with Saudi Arabia’s Public Investment Fund (PIF) for Ferrovial‘s stake, according to the two sources as well as another person privy to the development.

The Spanish firm is yet to take a final call on the issue, and the talks may not lead to a sale of its holding, the sources further noted.

None of the concerned parties commented on the matter.

Ferrovial, currently the single largest investor in Britain’s busiest airport, has been its stakeholder for 16 years.

Qatar Investment Authority (QIA) is the second biggest investor in Heathrow, with a 20% interest. Caisse de dépôt et placement du Québec (CDPQ) and Singaporean wealth fund GIC and China Investment Corporation also have considerable stakes in the airport.

Heathrow reported a £321m adjusted pre-tax loss in the first half of this year, driven by rising in costs and labour shortfall, versus £787m in the same period of 2021.

However, passenger volume increased to 26.1 million from 3.9 million over the period.